Updated on 2024/10/04

Information

 

写真a

 
WATANABE MOTONORI
 
Organization
International Institute for Carbon-Neutral Energy Research Advanced Energy Conversion Systems Thrust Associate Professor
Graduate School of Integrated Frontier Sciences Department of Automotive Science（Joint Appointment）
Title
Associate Professor
Profile
My research interests focuses on the material chemistry and photochemistry, and organic materials for opt-electronic devices. I focus to study the new fundamental organic dyes using the synthetic method that are candidates for dye-sensitized photo catalytic water-splitting reaction system in order to improve the light absorption, durability, and hydrogen production rate. Also, we focus the synthesis of novel organic dye for photo voltaic, and organic semicondoctor.
Homepage
External link

Degree

  • Doctor of Science

Research History

  • なし

    なし

  • なし

Research Interests・Research Keywords

  • Research theme：Photocatalytic CO2 reduction by organic-inorganic hydrid photocatalyst

    Keyword：organic-inorganic composite; photocatalyst; CO2 reduction

    Research period： 2023.4 - 2025.6

  • Research theme：Development of organic-inorganic hybrid photocatalyst

    Keyword：Interface, organic semiconductor, inorganic semiconductor, photocatalyst, visible light reaction, water decomposition

    Research period： 2014.1 - 2021.4

  • Research theme：Development of organic semiconductors and development to field effect transistors

    Keyword：Organic semiconductor, transistor

    Research period： 2011.6 - 2020.4

Awards

  • Chemical Society Japan Kyushu Branch Autumn research presentation symposium Best poster award

    2020.11   Chemical Society Japan Kyushu Branch  

  • 平成３１年度科学技術分野の文部科学大臣表彰科学技術賞及び若手科学者賞

    2019.4   文部科学省   有機 - 無機ハイブリッド光触媒による光水分解に関する研究

    　More details

    無機光触媒の開発の発展により、水から次世代エネルギー源となる水素を生産する手法が研究されてきたが、未だに高効率な水素生産を示す材料の設計指針は不明瞭である。また、太陽光を自然駆動力として用いる応用は、可視光応答材料が必要不可欠であるが、生体系を模倣した複雑反応系や窒素化などの処理が必要等、限られた反応系・材料のみでしか発現されていなかった。本業績では紫外光～近赤外光まで応答可能な有機半導体材料の新規合成法の開発を行い、有機材料が光触媒へ担持可能な修飾方法を展開し、また光応答により、光触媒水分解による水素生産で必要な電荷移動を行えることを見出した。これを既知・安価な無機光触媒と組み合わせることで、これまでに太陽光の５～６％成分である紫外光しか用いることのできなかった無機光触媒が、太陽光の４５％成分である可視光で応答し水から水素を生産することを明らかにし、新たな可視光応答光触媒系を構築した。また、適切な有機材料を無機光触媒材料に組み合わせることで、光触媒の水分解性能を向上する手法を提案した。本業績関連研究では有機半導体や有機色素材料を用い、一貫して太陽電池や光触媒の研究を行っており、非引用文件数が１００報を超える論文等世界から注目される研究を行っている。
    本研究成果は、有機－無機ハイブリッド光触媒を用いることで、光触媒水分解における既存の技術的課題に新たな解決策を提示するのみでなく、同様の系での他触媒反応への応用が期待され、本分野において学術的効果が波及すると期待される。

Papers

  • Activation of NO with microwave irradiation for low temperature direct decomposition

    Ikoma, Y; Siman, F; Watanabe, M; Inada, M; Takagaki, A; Ishihara, T

    APPLIED CATALYSIS A-GENERAL   687   2024.11   （ ISSN:0926-860X eISSN:1873-3875 ）

    　More details

    Publisher：Applied Catalysis A: General  

    Direct decomposition of nitric oxide (NO) on metal oxides under microwave (MW) irradiation was investigated and it was found that the most metal oxides show higher NO decomposition activity than that in the conventional electric furnace heating at low temperature. Among the examined oxides, it was found that TiO2, CeO2, ZrO2, and Y2O3 show about 95 % or higher NO conversion at 573 K, and both N2 and O2 are formed with almost equimolar amount. In particular, ZrO2 exhibited high and stable NO decomposition activity more than 25 h. In this study, the influence of coexisting gases on NO decomposition activity on ZrO2 under microwave heating was further investigated and the direct decomposition of NO can be proceeded even in the presence of 5 % O2, 5 % CO2, or humidified condition. Mechanism of high NO decomposition activity under MW irradiation was also studied and it was found that removal of oxygen from the catalyst was much increased under MW irradiation because of direct activation of oxygen and also direct activation of NO which is also suggested by pulse reaction.

    DOI： 10.1016/j.apcata.2024.119965

    Web of Science

    Scopus

  • Enhancing DSSCs and Photocatalytic Hydrogen Production with D-A(1)-A(2)-π-A Sensitizers Containing 10'H-Spiro [Fluorene-9,9'-Phenanthren]-10'-one and Benzo[c][1,2,5]Thiadiazole.

    Li H, Shen XF, Lin YS, Lin YH, Hung YT, Chen NH, Watanabe M, Chang YJ

    Chemistry, an Asian journal   19 ( 19 )   e202400697   2024.10

    　More details

    Language：English  

    DOI： 10.1002/asia.202400697

    PubMed

  • BaZr(Ce,Y)O<sub>3</sub>-Pr-Doped CeO<sub>2</sub> Double Columnar for the Cathodic Functional Layer of Ni-Fe Metal-Supported Protonic Ceramic Fuel Cells

    Kim, HY; Watanabe, M; Song, JT; Inada, M; Ishihara, T

    ACS APPLIED ENERGY MATERIALS   7 ( 18 )   7945 - 7955   2024.9   （ ISSN:2574-0962 ）

    　More details

    Publisher：ACS Applied Energy Materials  

    Metal-supported protonic ceramic fuel cells were prepared, and the effects of a double columnar layer at the cathode side of BaZr0.44Ce0.36Y0.2O3 (BZCY) on power density and open-circuit voltage (OCV) were studied. The double columnar structure of Pr0.2Ce0.8O2 (PrDC) and BZCY was prepared with pulsed laser deposition. It was found that the insertion of the double columnar layer was highly effective for increasing the power density and OCV. The optimum composition of the double columnar was BZCY:PrDC = 7:3, with a thickness of 200 nm. The power density of PCFCs with the BZCY-PrDC double columnar reached 413 mW/cm2, and the OCV was approximately 1.05 V at 873 K, which is six times higher than that of a cell without a functional layer. The high power density of the cell was attributed to the decreased overpotential of the cathode. Therefore, the BZCY-PrDC double columnar layer is effective in expanding the reaction site by increasing the proton concentration at the cathodic interface.

    DOI： 10.1021/acsaem.4c01529

    Web of Science

    Scopus

  • The effect of hydrophobicity of ruthenium complex dyes on photocatalytic water electrolysis

    Sharif, HM; Shen, XF; Watanabe, M

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   130 ( 8 )   2024.8   （ ISSN:0947-8396 eISSN:1432-0630 ）

    　More details

    Publisher：Applied Physics A: Materials Science and Processing  

    Bis(2,2′-bipyridine)bis(isothiocyanato)ruthenium complexes are organo-metallic dyes having broad absorption properties in the visible region that are widely used in dye-sensitized opto-electronic devices. Here, we report the photocurrent measurement and stability studies of three Ru-complexes, cis-bis(isothiocyanato)bis(2,2′-bipyridyl-4,4′-dicarboxylato)ruthenium(II) (N3), its hydrophobic analogues cis-bis(isothiocyanato)(2,2’-bipyridyl-4,4’-dicarboxylato)(4,4’-di-nonyl-2’-bipyridyl)ruthenium(II) (Z-907) and hydrophilic analogues (di-tetrabutylammonium cis-bis(isothiocyanato)bis(2,2′-bipyridyl-4,4′-dicarboxylato)ruthenium(II), (N719). Z907 shows higher stability and photoelectric conversion efficiency after 2 h analysis than its hydrophilic counter-molecules, N3 and N719. The Z907-TiO2 system exhibited a 1.09 mA/cm2 photocurrent density after 2 h of analysis, with 78% of its performance retained even after an extended 48 h of analysis. The activity of N719-TiO2 and N3-TiO2 sharply decreased after 2 h of analysis, and significant desorption of the dye present on titanium oxide was also observed. This study suggests that hydrophobicity at the electrode-dye interface is a major factor supporting the stability of the dye-sensitized photoanode.

    DOI： 10.1007/s00339-024-07730-1

    Web of Science

    Scopus

  • Nanocomposite of Nb-based binary phase for lowering the activation energy of Li<SUP>+</SUP> intercalation as an anode for high-performance aqueous dual-ion batteries

    Yang, DY; Matsuda, J; Song, JT; Watanabe, M; Ishihara, T

    JOURNAL OF MATERIALS CHEMISTRY A   12 ( 22 )   13338 - 13347   2024.6   （ ISSN:2050-7488 eISSN:2050-7496 ）

    　More details

    Publisher：Journal of Materials Chemistry A  

    Aqueous dual-ion batteries have good safety, environmental compatibility, and low cost due to the use of an aqueous electrolyte. However, water electrolysis occurs during charging at high potential, resulting in a poor cyclic stability of aqueous dual-ion batteries. Hence, novel anode materials are urgently needed to be developed for aqueous dual-ion batteries with low water electrolysis. A niobium-based binary-phase composite material is reported with a capacity of 135 mA h g−1 at a current density of 0.2 mA cm−2 and with excellent reversibility in the potential range of −1.3-0 V vs. Ag/AgCl. The activation energy of Li+ intercalation was obviously decreased because of the formation of an interface, which enhanced the Li+ intercalation reaction between FeNbO4 and MoNb12O33. In addition, the lower amount of Fe2+ in the lattice of MoNb12O33 caused localized compressive strain, which promoted fast Li+ diffusion in MoNb12O33. A full dual-ion battery of 3.0 V was constructed using the binary-phase niobium-based composite for the anode, and demonstrated a high cycle stability and an average coulombic efficiency of 91% over 300 cycles. Furthermore, considering both the electrolyte and electrode materials, the theoretical energy density of this dual-ion battery was estimated to be 250 W h kg−1, which is close to that of the current Li-ion rechargeable battery.

    DOI： 10.1039/d4ta01293c

    Web of Science

    Scopus

  • High-Pressure Torsion Processing of Serine and Glutamic Acid: Understanding Mechanochemical Behavior of Amino Acids under Astronomical Impacts

    Edalati, K; Hidalgo-Jiménez, J; Nguyen, TT; Watanabe, M; Taniguchi, I

    ADVANCED ENGINEERING MATERIALS   2024.4   （ ISSN:1438-1656 eISSN:1527-2648 ）

    　More details

    Publisher：Advanced Engineering Materials  

    Astronomical impacts by small solar system bodies (meteoroids, asteroids, comets, and transitional objects) are considered a mechanism for delivering amino acids and their polymerization to proteins in early Earth conditions. High-pressure torsion (HPT) is a new methodology to simulate such impacts and clarify the behavior of biomolecules. Herein, two amino acids, crystalline L-serine and L-glutamic acid that are detected in meteorites, are processed by HPT and examined by ex situ X-ray diffraction, Raman spectroscopy, nuclear magnetic resonance, Fourier-transform infrared spectroscopy, and in situ mechanical shear testing. No polymerization, chemical reactions, or phase transformations are detected after HPT, indicating that the stability and presence of these two amino acids in meteorites are quite reasonable. However, some microstructural and mechanical changes like crystal size reduction to the nanometer level, crystal defect formation, lattice expansion by vacancy formation, and shear strength enhancement to the steady state are found which are similar to the behaviors reported in metals and ceramics after HPT processing.

    DOI： 10.1002/adem.202302267

    Web of Science

    Scopus

  • [FeFe]-Hydrogenase Encapsulated in Zeolitic Imidazolate Framework (ZIF)-8 Nanoparticles as a Robust Biocatalyst for Photocatalytic Hydrogen Production

    Kosem, N; Ohsaki, Y; Watanabe, M; Song, JT; Ishihara, T

    ACS SUSTAINABLE CHEMISTRY & ENGINEERING   12 ( 16 )   6300 - 6309   2024.4   （ ISSN:2168-0485 ）

    　More details

    Publisher：ACS Sustainable Chemistry and Engineering  

    [FeFe]-hydrogenase (HydA) is an active biocatalytic enzyme for solar-to-hydrogen (H2) conversion. However, stability is a main challenge that limits practical applications. This work aims to encourage the efficiency of HydA by encapsulating it in the zeolitic imidazolate framework-8 (ZIF-8) as a synthetic protective shield. The construction of HydA@ZIF-8 nanoparticles, with an average diameter of 700-1000 nm, at ambient conditions can preserve HydA activity within a spatially confined microenvironment, as characterized by scanning electron microscopy and X-ray diffraction analysis. Based on MV•+-dependent H2 production activity and kinetic analysis, both the stability and efficiency of HydA@ZIF-8 surpass those of free HydA and whole-cell biocatalysts over a wider range of pH and temperature. The achievement of robust HydA@ZIF-8 construction represents a significant step forward in the development of biocatalysts for various future applications.

    DOI： 10.1021/acssuschemeng.3c08560

    Web of Science

    Scopus

  • Surface Modification of NiFe Anode-Support for Thin-Film Solid-Oxide Fuel Cell

    KHAN Sovann, SONG Jun Tae, WATANABE Motonori, ISHIHARA Tatsumi

    Electrochemistry   92 ( 3 )   037005 - 037005   2024.3   （ ISSN:13443542 eISSN:21862451 ）

    　More details

    Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Electrochemical Society of Japan  

    <p>A dense NiO-Fe<sub>2</sub>O<sub>3</sub> (NiFe) pellet has been developed as a potential anode-support for thin-film solid oxide fuel cells (SOFCs). However, preparation of dense NiFe is very challenging. Hole-formed NiFe pellets or porous NiFe pellets are frequently formed, which cannot be used as a support (substrate) for thin-film SOFCs. Therefore, this hole-formed NiFe support is simply wasted. In this report, we attempt to re-qualify this NiFe support to be a valuable substrate, which can be used for fabricating thin-film SOFCs. By deposition of smaller NiFe particles to cover the hole-formed NiFe support, the surface of this NiFe pellet is modified. Large holes on the surface disappear. The newly formed NiFe support can be used for fabricating a single cell with La<sub>0.9</sub>Sr<sub>0.1</sub>Ga<sub>0.8</sub>Mg<sub>0.2</sub>O<sub>3−δ</sub> as thin-film electrolyte operated at intermediate temperature. Maximum power density generated from this cell is 0.45, 0.86 and 1.28 W cm<sup>−2</sup> at 873, 923 and 973 K, respectively.</p>

    DOI： 10.5796/electrochemistry.23-00164

    Web of Science

    Scopus

    CiNii Research

    researchmap

  • Photobiocatalytic conversion of solar energy to NH3 from N2 and H2O under ambient condition

    Nuttavut Kosem, Xiao-feng Shen, Yutaka Ohsaki, Motonori Watanabe, Jun Tae Song, Tatsumi Ishihara

    Applied Catalysis B: Environmental   342   123431 - 123431   2024.3   （ ISSN:0926-3373 eISSN:1873-3883 ）

    　More details

    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.apcatb.2023.123431

    Web of Science

    Scopus

    researchmap

  • Controlled Pore Size of NiO-YSZ Tubular Substrate for Improved Performance of Reversible Solid Oxide Cell Using LaGaO<sub>3</sub> Electrolyte Film

    Bin Liu, Tan Zhe, Sun Kim, Jun Tae Song, Motonori Watanabe, Tatsumi Ishihara

    Journal of The Electrochemical Society   171 ( 2 )   024504 - 024504   2024.2   （ ISSN:0013-4651 eISSN:1945-7111 ）

    　More details

    Publishing type：Research paper (scientific journal)   Publisher：The Electrochemical Society  

    Effects of channel size in NiO-YSZ porous substrate were studied on power density in solid oxide fuel cell mode and electrolysis current in steam electrolysis mode. It was found that the cell deposited on anode substrate with larger pore diameter shows a superior performance. The LSGM cell prepared on Ni-YSZ tube with average channel diameter of ca. 2.5 μm shows the maximum power density of 0.36 W cm<sup>−2</sup> in SOFC mode and 0.42 A cm<sup>−2</sup> at 1.6 V in SOEC mode at 873 K. Spike potential noise which may be caused by insufficient gas diffusion in NiO-YSZ porous substrate was observed under constant current electrolysis condition in case of NiO-YSZ tube with narrow channel and the spike noise is suppressed by increasing channel size. NiO-YSZ tube with large channel size is also effective for increasing long term stability in electrolysis mode.

    DOI： 10.1149/1945-7111/ad2815

    Web of Science

    Scopus

    researchmap

    Other Link： https://iopscience.iop.org/article/10.1149/1945-7111/ad2815/pdf

  • Enhanced charge mediator properties of photocatalysts with reduced graphene nanoribbons for photocatalytic acceleration of hydrogen production in aqueous media

    Ryono Morita, Yasushi Murakami, Xiao-Feng Shen, Dengyao Yang, Motonori Watanabe, Jun Tae Song, Atsushi Takagaki, Tatsumi Ishihara

    Journal of Materials Chemistry C   12 ( 5 )   1652 - 1660   2024.2   （ ISSN:2050-7526 eISSN:2050-7534 ）

    　More details

    Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

    In this study, a hybrid photocatalyst with titanium oxide using reduced graphene nanoribbons (rGNR) was fabricated.

    DOI： 10.1039/d3tc03622g

    Web of Science

    Scopus

    researchmap

  • Visible light driven hydrogen peroxide production by oxygen and phosphorus co-doped CoP-C3N4 photocatalyst

    Kaito Jinguji, Motonori Watanabe, Ryono Morita, Yuta Takaoka, Md. Sharif Hossain, Jun Tae Song, Atsushi Takagaki, Junko Matsuda, Tatsumi Ishihara

    Catalysis Today   426   114400 - 114400   2024.1   （ ISSN:0920-5861 eISSN:1873-4308 ）

    　More details

    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.cattod.2023.114400

    Web of Science

    Scopus

    researchmap

  • Sensitizers D-A<inf>1</inf>-A<inf>2</inf>-π-A Include 10'H-Spiro[fluorene-9,9'-Phenanthren].Benzo[c] and -10'-one.[ 1, 2, 5]Thiadiazole for Photocatalytic Hydrogen Production and Dye-Sensitized Solar Cells

    Li H., Shen X.F., Lin Y.S., Lin Y.H., Chen N.H., Hung Y.T., Watanabe M., Chang Y.J.

    2024 31st International Workshop on Active-Matrix Flatpanel Displays and Devices, AM-FPD 2024   127 - 130   2024   （ ISBN:9784991216961 ）

    　More details

    Publisher：2024 31st International Workshop on Active-Matrix Flatpanel Displays and Devices, AM-FPD 2024  

    The structural modifications prevent molecular aggregation by adding a bulky spiro[fluorene-9,9'-phenanthrene ]-10' auxiliary acceptor (A1) and benzo[c][1,2,5]thiadiazole (A2) between the donor and π-bridge moiety. Additionally, the carbonyl group improves the capture of Li+ ions, delaying charge recombination. Moreover, sensitizer FZ-2's light absorption range is expanded and its energy conversion efficiency is improved under AM1.5 circumstances, reaching up to 5.72%, thanks to the enlarged π-conjugation. Co-sensitization testing under one sun revealed an effectiveness of 9.60% using N719 and FZ-2. Due to FZ-2's strong absorption efficiency at short wavelengths, which offsets N719's inadequacies in this range, the co-sensitization performance of FZ-2 and N719 is superior. Additionally, FZ-sensitizers demonstrate excellent photocatalytic hydrogen production efficiency. The hydrogen production activities of FZ-1 are 7430 μmol/g (1 hour) and 64004 μmol/g (12 hours), FZ-2 hydrogen production activities are 9190 μmol/g (1 hour) and 76582 μmol/g (12 hours). This suggests that FZ-2 is more effective at injecting charges into TiO2 and using them for water splitting. After 12 hours of photocatalytic water splitting stability tests, FZ-1 and FZ-2 exhibited TON of 4249 and 5378, respectively.

    DOI： 10.23919/AM-FPD61635.2024.10615532

    Scopus

  • Oxide ion conductivity in doped bismuth gallate mullite type oxide, Bi2Ga4O9

    Maksymilian Kluczny, Thi Nguyen, Jun Tae Song, Motonori Watanabe, Atsushi Takagaki, Aleksandar Staykov, Tatsumi Ishihara

    Solid State Ionics   401   116343 - 116343   2023.11   （ ISSN:0167-2738 eISSN:1872-7689 ）

    　More details

    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.ssi.2023.116343

    Web of Science

    Scopus

    researchmap

  • The acceleration of BODIPY dye-sensitized photocatalytic hydrogen production in aqueous ascorbic acid solutions using alkyl-chain formed second coordination sphere effects

    Xiao-Feng Shen, Motonori Watanabe, Jun Tae Song, Atsushi Takagaki, Tatsuki Abe, Keiji Tanaka, Tatsumi Ishihara

    Journal of Materials Chemistry A   11 ( 39 )   21153 - 21160   2023.10   （ ISSN:2050-7488 eISSN:2050-7496 ）

    　More details

    Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

    Optimizing hydrogen production in ascorbic acid solutions: enhancing BODIPY dye-sensitized processes through alkyl-chain-enhanced second coordination sphere effects.

    DOI： 10.1039/d3ta03682k

    Web of Science

    Scopus

    researchmap

  • Pronounced Strain Effects on Oxygen Dissociation; Pt‐ or Au‐Dispersed Pr<sub>2</sub>Ni(Cu, Ga)O<sub>4</sub> for Active Cathode of Solid Oxide Fuel Cells

    Sun Jae Kim, Motonori Watanabe, Tatsumi Ishihara

    Advanced Energy and Sustainability Research   4 ( 10 )   2023.10   （ ISSN:2699-9412 eISSN:2699-9412 ）

    　More details

    Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    The correlation between lattice strain induced by metal dispersion into grain and the cathodic overpotential is studied for increasing oxygen‐dissociation activity and improving power density of solid oxide fuel cells (SOFC) at decreased temperature. Pt or Au dispersion in Pr<sub>1.90</sub>Ni<sub>0.71</sub>Cu<sub>0.21</sub>Ga<sub>0.05</sub>O<sub>4+d</sub> (PNCG) is prepared and the 3D tensile strain is successfully induced after sintering by a mismatch in thermal expansion coefficient. Due to higher hardness and melting temperature, Pt dispersion into bulk of PNCG introduces larger tensile strain than that by Au at the same amount. In particular, at 1 mol% Pt dispersion, large tensile strain of 0.67% is induced. Overpotential of 1 mol% Pt‐PNCG cathode is 8 times smaller (35 mV) than that of PNCG (270 mV) at 800 °C and 300 mA cm<sup>−2</sup>, and it is found that the cathodic overpotential of PNCG is decreased with tensile strain on both Pt and Au dispersion. This cathodic activity enhancement appears to be related with the increased diffusivity of oxide ion in PNCG. In this study, cathodic overpotential is more significantly influenced by the induced tensile strain comparing with the intrinsic catalytic activity of the dispersed metal.

    DOI： 10.1002/aesr.202300084

    Web of Science

    Scopus

    researchmap

  • Proton conductivity in Yb-doped BaZrO3-based thin film prepared by pulsed laser deposition

    Eiki Niwa, Maksymilian Kluczny, Hyo Young Kim, Jun Tae Song, Motonori Watanabe, Atsushi Takagaki, Tatsumi Ishihara

    SOLID STATE IONICS   396   2023.8   （ ISSN:0167-2738 eISSN:1872-7689 ）

    　More details

    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER  

    For increasing the performance of PCFC (Protonic Ceramic Fuel Cells), it is important to prepare high-quality thin films of electrolyte materials. In this study, the preparation condition of the thin film of BaZr0.8Yb0.2O2.9 (BZYb) by pulsed laser deposition (PLD) method was optimized and the electrical conductivities of the obtained films were measured. The thin film was prepared by PLD using two kinds of BZYb targets, which were prepared by solids state reaction and Pechini method. Both thin-film samples have the single phase of the cubic perovskitetype structure, however, morphology as well as the orientation of the BZYb film was significantly different. The thin film using the target material by Pechini method is a high crystalline orientation and partially oriented [211] direction. The electrical conductivities of the obtained thin films at reduction atmosphere are dominated by proton conductivity, which is almost the same as that of the bulk sample despite [211] orientation.

    DOI： 10.1016/j.ssi.2023.116240

    Web of Science

    Scopus

    researchmap

  • Bi/UiO-66-derived electrocatalysts for high CO2-to-formate conversion rate

    Yuta Takaoka, Jun Tae Song, Atsushi Takagaki, Motonori Watanabe, Tatsumi Ishihara

    Applied Catalysis B: Environmental   326   122400 - 122400   2023.6   （ ISSN:0926-3373 eISSN:1873-3883 ）

    　More details

    Language：Others   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.apcatb.2023.122400

    Web of Science

    Scopus

    researchmap

  • Hybridizing Tetraglyme to Aqueous Electrolyte with Concentrated Salts Promote Intercalation of Anions on Graphite Cathode in Dual-Ion Battery

    Yang Dengyao, Watanabe Motonori, Ishihara Tatsumi

    Small Methods   7 ( 9 )   2300249   2023.5   （ eISSN:23669608 ）

    　More details

    Language：English  

    The amount of support salt in electrolytes determines the capacity of a dual-ion battery (DIB), and highly concentrated electrolytes are required for developing the high energy density DIB. In this study, hybrid aqueous tetraglyme (G4) electrolyte is investigated to develop high energy density aqueous DIB that is composed of carbon and Mo_6S_8 for cathode and anode, respectively. Impedance measurement reveals that introduced G4 increases the activation energy of the anode; however, decreases the activation energy for anion intercalation into the carbon cathode. This decreases the activation energy resulted from the G4 molecule strongly solvated to Li^+ resulting in weakening anion trapped in “contact ion pair” in concentrated aqueous electrolyte. So, hybrid G4-aqueous electrolyte is useful for better electrochemical intercalation of anion. In addition, this hybrid electrolyte is highly stable by formation of stable solid electrode–electrolyte interphase on Mo_6S_8 anode and discharge capacity of 37 mAh g^<−1>, and 72% retained capacity after 500 cycles with a high average coulombic efficiency of 93% is achieved.

    CiNii Research

  • Hybridizing Tetraglyme to Aqueous Electrolyte with Concentrated Salts Promote Intercalation of Anions on Graphite Cathode in Dual-Ion Battery

    Dengyao Yang, Motonori Watanabe, Tatsumi Ishihara

    SMALL METHODS   7 ( 9 )   e2300249   2023.5   （ ISSN:2366-9608 ）

    　More details

    Language：English   Publishing type：Research paper (scientific journal)   Publisher：WILEY-V C H VERLAG GMBH  

    The amount of support salt in electrolytes determines the capacity of a dual-ion battery (DIB), and highly concentrated electrolytes are required for developing the high energy density DIB. In this study, hybrid aqueous tetraglyme (G4) electrolyte is investigated to develop high energy density aqueous DIB that is composed of carbon and Mo6S8 for cathode and anode, respectively. Impedance measurement reveals that introduced G4 increases the activation energy of the anode; however, decreases the activation energy for anion intercalation into the carbon cathode. This decreases the activation energy resulted from the G4 molecule strongly solvated to Li+ resulting in weakening anion trapped in "contact ion pair" in concentrated aqueous electrolyte. So, hybrid G4-aqueous electrolyte is useful for better electrochemical intercalation of anion. In addition, this hybrid electrolyte is highly stable by formation of stable solid electrode-electrolyte interphase on Mo6S8 anode and discharge capacity of 37 mAh g(-1), and 72% retained capacity after 500 cycles with a high average coulombic efficiency of 93% is achieved.

    DOI： 10.1002/smtd.202300249

    Web of Science

    Scopus

    PubMed

    researchmap

  • Controlled Solvation Structure of a Zn Ion in an Aqueous Electrolyte by Amine Additives for Long Cycle Life of a Large Capacity Zn-Air Rechargeable Battery

    Tatsumi Ishihara, Yuiko Inoishi, Sun Kim, Aleksandar Staykov, Motonori Watanabe, Nao Naohara, Kimiko Takahashi, Takashi Itoh

    JOURNAL OF PHYSICAL CHEMISTRY C   127 ( 14 )   6619 - 6628   2023.4   （ ISSN:1932-7447 eISSN:1932-7455 ）

    　More details

    Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER CHEMICAL SOC  

    A rechargeable Zn-air battery is expected as a large capacity battery alternative to the Li ion battery; however, short cycle life is the current issue. In this study, it was found that the addition of 3,3-diaminodipropylamine was effective for preventing the formation of a Zn dendrite in the anode resulting in a long cycle life with more than 300 cycles and a discharge capacity larger than 700 mAh/g (>85% Zn used for discharge) when Ni0.8Fe0.2Co2O4 and 8 M KOH-H2O were used for the air electrode and electrolyte, respectively. The increased cycle stability could be assigned to the change in the solvated structure of Zn2+ in the electrolyte by the strong interaction between 3,3-diaminodipropylamine and solvated water, which is suggested by Raman and Fourier transform infrared spectroscopic analyses. Ab initio molecular dynamics simulations suggest that the amine is strongly interacted with OH of solvated water molecules and changes the coordination number of Zn2+, and as result, the size of the solvated Zn2+ cluster was increased, resulting in enhanced Zn2+ mobility in the electrolyte for the uniform deposition of Zn on the anode during charge by increased mobility.

    DOI： 10.1021/acs.jpcc.2c08682

    Web of Science

    Scopus

    researchmap

  • A comprehensive study on rational biocatalysts and individual components of photobiocatalytic H2 production systems

    Nuttavut Kosem, Motonori Watanabe, Jun Tae Song, Atsushi Takagaki, Tatsumi Ishihara

    APPLIED CATALYSIS A-GENERAL   651   2023.2   （ ISSN:0926-860X eISSN:1873-3875 ）

    　More details

    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER  

    Photobiocatalytic system has been developing as a promising approach for H2 production. Herein, the rational characteristics of biocatalysts and the role of individual components affecting the efficiency of the system were investigated. Photocatalytic studies showed that tris (2-amino-2-hydroxymethyl-1,3-propanediol) was an ideal electron donor for viologen reduction by TiO2. Biocatalytic reaction revealed that cell permeability, the redox potential of electron mediators and the cell envelope were crucial to the activity of whole-cell biocatalysts. In photobiocatalytic system, recombinant Escherichia coli with a turnover frequency of 39.43 +/- 3.77 s-1 based on [FeFe]-hydrogenase activity was a more rational biocatalyst than Anabaena variabilis. A comprehensive study found that the presence of TiO2, light and biocatalysts strongly enhanced H2 production, whereas Tris and MV2+ had less influence. A maximum rate was found at 16.73 +/- 1.03 mu mol/min with a solar-to-H2 conversion of 1.58 +/- 0.10 %. Understanding the role of each component will guide the development of high-efficient photobiocatalysis.

    DOI： 10.1016/j.apcata.2022.119019

    Web of Science

    Scopus

    researchmap

  • Pyridyl anchoring squaraine as a near-infrared dye sensitizer for effective sensitized hydrogen production over a titanium dioxide photocatalyst in water medium

    Xiao-Feng Shen, Motonori Watanabe, Atsushi Takagaki, Jun Tae Song, Tatsuki Abe, Daisuke Kawaguchi, Keiji Tanaka, Tatsumi Ishihara

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   129 ( 1 )   2023.1   （ ISSN:0947-8396 eISSN:1432-0630 ）

    　More details

    Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER HEIDELBERG  

    Squaraine dyes are organic dyes having strong and narrow absorption properties in the near-infrared region that are widely used in photovoltaic and biomedical applications. In this work, squaraine dye (SA1) was synthesized as a dye sensitizer for a dye-sensitized photocatalytic system, which was composed of SA1 and Pt-loaded TiO2 powder photocatalyst (SA1/Pt-TiO2). The SA1/Pt-TiO2 system exhibited a good hydrogen production performance within 150 h and an apparent quantum yield of 1.4% under 800 nm monochromatic light irradiation. However, during the photocatalytic reaction, the photocatalytic activity of SA1/Pt-TiO2 decreased due to photodecomposition. Ultraviolet-visible absorption spectroscopy, H-1 nuclear magnetic resonance spectroscopy, and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry measurements were performed to investigate the mechanism of the decomposition of the squaraine moiety of SA1, the decomposition process, and the structure of the decomposed material. The results show that even without the Pt-loaded TiO2 powder photocatalyst, SA1 undergoes photodissociation, which cleaves the bond between the indoline moiety and the square acid.

    DOI： 10.1007/s00339-022-06281-7

    Web of Science

    Scopus

    researchmap

  • A case report of anti-N-methyl-D-aspartate receptor encephalitis with chromosomally integrated human herpesvirus 6

    Iwao, K; Watanabe, M; Mukaino, T; Fujii, T; Yamasaki, R; Isobe, N

    NEUROLOGY AND CLINICAL NEUROSCIENCE   11 ( 1 )   52 - 54   2023.1   （ ISSN:2049-4173 ）

    　More details

  • High Voltage and Capacity Dual-Ion Battery Using Acetonitrile-Aqueous Hybrid Electrolyte with Concentrated LiFSI-LiTFSI

    Dengyao Yang, Motonori Watanabe, Atsushi Takagaki, Tatsumi Ishihara

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   169 ( 12 )   2022.12   （ ISSN:0013-4651 eISSN:1945-7111 ）

    　More details

    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELECTROCHEMICAL SOC INC  

    Water-acetonitrile (AN) hybrid electrolyte with high concentration of bis(trifluoromethanesulfonyl) imide (LiTFSI) and Lithium bis(fluorosulfonyl) imide (LiFSI) (LiTFSI-LiFSI=3:1, molar ratio) supporting salts are studied for the high potential and large capacity rechargeable dual-ion battery. Water-acetonitrile hybrid electrolyte (WA) shows a wide electrochemical stability window of 3.1 V in 20 m aqueous electrolyte and 3.6 V in 20 m 9LiFSI-1LiTFSI in water: AN=1:3 molar ratio electrolyte. In particular, high oxidation potential, which can be assigned to the strong solvated ionic cluster formed between AN, water and LiTFSI-LiFSI supporting salts. The dual-ion battery is assembled using the graphitic carbon (KS6) and the activated carbon (AC) as cathode and anode, respectively, and 20 m LiTFSI-LiFSI in hybrid AN-water as electrolyte. It is found that the reasonably large capacity, coulombic efficiency and cycle stability were achieved. The KS6/AC cell shows 86 mAh g(-1) at the initial cycle and 50 mAh g(-1) at 100th cycle in a voltage range of 0-3.25 V, and the average coulombic efficiency of 85% is sustained over 200 cycles. The solvated structure of water to Li+ is strengthened by addition of AN from ATR-IR and NMR spectrums analysis and this change in the solvated structure is the main reason for the increased performance of the aqueous dual-ion battery.

    DOI： 10.1149/1945-7111/acaad1

    Web of Science

    Scopus

    researchmap

  • Solvated Structure of Hybrid Tetraglyme-Aqueous Electrolyte Dissolving High-Concentration LiTFSI-LiFSI for Dual-Ion Battery

    Dengyao Yang, Huan Li, Xiaofeng Shen, Motonori Watanabe, Tatsumi Ishihara

    CHEMSUSCHEM   16 ( 4 )   e202201805   2022.12   （ ISSN:1864-5631 eISSN:1864-564X ）

    　More details

    Language：English   Publishing type：Research paper (scientific journal)   Publisher：WILEY-V C H VERLAG GMBH  

    The solvated structure of a highly concentrated hybrid tetraglyme (G4)-water electrolyte was studied for an increasing cycle stability and performance of a KS6 used dual-ion battery. Hybrid solvent of G4 and water with a weight ratio of 2 to 8 was able to dissolve 9LiFSI-1LiTFSI supporting salts up to 37 mol kg(-1) (37 mol kg(-1) G2W8). In spite of such high concentration of supporting salts, reasonable charge and discharge performance of dual-ion battery (discharge capacity of approximate to 40 mAh g(-1) and coulombic efficiency of 90 %) were exhibited over 300 cycles. This was attributed to the decreased hydrogen evolution reaction (HER) potential to -1.05 V vs. Ag/AgCl by addition of G4. From Fourier-transform infrared, nuclear magnetic resonance, and Raman spectroscopies, G4 molecules were more strongly coordinated to Li+ to form ion pairs of [Li(G4)(x)(H2O)(y)](+) complex in hybrid G4-water electrolyte. Co-intercalation of bis(trifluoromethanesulfonyl)imide (TFSI-) and bis(fluorosulfonyl)imide (FSI-) into graphitic carbon KS6 cathode was confirmed in hybrid aqueous electrolyte.

    DOI： 10.1002/cssc.202201805

    Web of Science

    Scopus

    PubMed

    researchmap

  • Significant CO2 photoreduction on a high-entropy oxynitride

    Saeid Akrami, Parisa Edalati, Yu Shundo, Motonori Watanabe, Tatsumi Ishihara, Masayoshi Fuji, Kaveh Edalati

    CHEMICAL ENGINEERING JOURNAL   449   2022.12   （ ISSN:1385-8947 eISSN:1873-3212 ）

    　More details

    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE SA  

    CO(2 )photoreduction on photocatalysts is a nature-friendly solution to decrease the CO2 amount, but the method still has low efficiency because of difficult separation and easy recombination of charge carriers in available catalysts. In this study, a high-entropy oxynitride was introduced as an active photocatalyst for photoreduction. The material had a chemical composition of TiZrNbHfTaO6N3 and was produced by a high-pressure torsion method followed by oxidation and nitriding. It showed higher photocatalytic CO2 to CO conversion compared to corresponding high-entropy oxide, benchmark photocatalyst P25 TiO2, and almost all catalysts introduced in the literature. The high activity of this oxynitride, which also showed good chemical stability, was attributed to the large absorbance of light and easy separation of electrons and holes, the low recombination of charge carriers, and the high CO(2 )adsorption on the surface. These findings introduce high-entropy oxynitrides as promising photocatalysts for CO(2 )photoreduction.

    DOI： 10.1016/j.cej.2022.137800

    Web of Science

    Scopus

    researchmap

  • Introduction of tensile strain into titanium dioxide for increased solid acid catalytic activity

    Atsushi Takagaki, Taiga Ozaki, Jun Tae Song, Eiki Niwa, Motonori Watanabe, Tatsumi Ishihara

    CATALYSIS SCIENCE & TECHNOLOGY   12 ( 21 )   6359 - 6362   2022.10   （ ISSN:2044-4753 eISSN:2044-4761 ）

    　More details

    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ROYAL SOC CHEMISTRY  

    Strained metal oxides are known to exhibit improved activity for redox and photocatalytic reactions. Here, we intentionally introduced tensile strain into rutile-type TiO2 by utilizing the difference in thermal expansion coefficients between TiO2 and Au and applied it as a solid acid catalyst. It was demonstrated that its acid catalytic activity in the acetalization of furfural was enhanced by increasing the degree of the strain introduced.

    DOI： 10.1039/d2cy00736c

    Web of Science

    Scopus

    researchmap

  • Particle Size Effect on Hydrogen Cyanide Synthesis with CH<sub>4</sub> and NO over an Alumina-supported Platinum Catalyst

    YAMASAKI Tatsuya, TAKAGAKI Atsushi, SHISHIDO Tetsuya, BANDO Kyoko K., KODAIRA Tetsuya, MURAKAMI Junichi, SONG Jun Tae, NIWA Eiki, WATANABE Motonori, ISHIHARA Tatsumi

    Journal of the Japan Petroleum Institute   65 ( 5 )   184 - 191   2022.9   （ ISSN:13468804 eISSN:1349273X ）

    　More details

    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Petroleum Institute  

    <p>The particle size effect of platinum nanoparticles on the conversion of methane (CH<sub>4</sub>) into hydrogen cyanide (HCN) using nitric oxide (NO) as an oxidant over the Pt supported (γ + θ)-alumina was investigated. The Pt catalysts with various average particle size in the range of 1.6 to 4.1 nm were obtained by controlling the loading amount and calcination temperature. Amount of the Pt surface sites was determined by CO titration using a pulse method and the catalytic activity was evaluated under same contact time. In case of the catalysts having small particle size (1.6-3.2 nm) of Pt, NO conversion was lower than the large one. The catalysts having large particle size (4.1-4.2 nm) exhibited high selectivity of HCN reaching 53.5 % at 1.3 % C-based yield at 400 °C over 10 wt% Pt/Al<sub>2</sub>O<sub>3</sub>. One of the reasons for higher activity with the larger Pt particles is suppression of the sequential reaction of HCN to carbon dioxide and ammonia which likely proceeded at the interface between metal and support. Pt L<sub>3</sub>-edge X-ray adsorption fine structure (XAFS) spectra showed that the small particle catalysts were covered with Pt–CN species after the reaction test. In contrast, Pt–CO was observed as main adsorbed species on the large particle catalysts, suggesting that HCN desorption process was facile for the larger Pt particle case.</p>

    DOI： 10.1627/jpi.65.184

    Web of Science

    Scopus

    CiNii Research

    researchmap

  • Enhanced CO<sub>2</sub> conversion on highly-strained and oxygen-deficient BiVO<sub>4</sub> photocatalyst

    Akrami, S; Murakami, Y; Watanabe, M; Ishihara, T; Arita, M; Guo, QX; Fuji, M; Edalati, K

    CHEMICAL ENGINEERING JOURNAL   442   2022.8   （ ISSN:1385-8947 eISSN:1873-3212 ）

    　More details

  • [2.2]- and [3.3]Paracyclophane as Bridging Units in Organic Dyads for Visible-Light-Driven Dye-Sensitized Hydrogen Production

    Motonori Watanabe, Yuka Ono, Tatsumi Ishihara, Yuan Jay Chang, Masahiko Shibahara

    CHEMISTRY-A EUROPEAN JOURNAL   28 ( 43 )   e202200790   2022.8   （ ISSN:0947-6539 eISSN:1521-3765 ）

    　More details

    Language：English   Publishing type：Research paper (scientific journal)   Publisher：WILEY-V C H VERLAG GMBH  

    Novel donor-acceptor dyads containing [2.2]- and [3.3]paracyclophane (PCP) as the bridging moiety were synthesized and used to effectively fabricate dye-sensitized hydrogen production systems. All the prepared compounds had a phenothiazine and a cyanoacrylic acid/pyridinyl acrylonitrile moiety acting as an electron donor and acceptor, respectively. Although cyclic voltammetry measurements showed similar electron-donating properties among all the synthesized dyads, the lowest absorption energy of the [2.2]PCP moiety was lower than that of the [3.3]PCP one; this was due to its shorter distance between benzene rings, which could effectively drive the charge transfer between the donor and acceptor chromophores. Under visible light (>395 nm), a dyad-loaded photocatalyst in a 0.5 M aqueous glycerol solution generated detectable hydrogen gases. The optimal turnover number and photocurrent order exhibited the same trend as the hydrogen production rate since the suggested number of excited photons played a critical role in hydrogen production.

    DOI： 10.1002/chem.202200790

    Web of Science

    Scopus

    PubMed

    researchmap

  • Photocatalytic Water Splitting on KTa(Zr)O-3 Modified with Acene-Based Organic Semiconductors

    Hidehisa Hagiwara, Motonori Watanabe, Sun Kim, Kohei Higashi, Tatsumi Ishihara

    JOURNAL OF PHYSICAL CHEMISTRY C   126 ( 23 )   9634 - 9641   2022.6   （ ISSN:1932-7447 eISSN:1932-7455 ）

    　More details

    Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER CHEMICAL SOC  

    The modification effect of acene dyes such as 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-PEN) and difuranoan-thracene derivatives on the photocatalytic water splitting activity of Pt-loaded KTa(Zr)O-3 was studied. The surface modification of KTa(Zr)O-3 powder with acene dyes was conducted with an evaporation-to-dryness method using pyridine as a solvent. TIPSPEN is the most effective dye for increasing the hydrogen formation rate on the KTa(Zr)O-3 catalyst, which became larger by 14 times. The fluorescence spectrum of the TIPS-PEN-modified catalyst revealed that the excitation energy of KTa(Zr)O(3 )was transferred to the Pt cocatalyst through the TIPS-PEN moiety. The wavelength dependence of the photocatalytic activity was investigated, and the water splitting activity was improved by irradiating with both ultraviolet and visible light comparing with the case of irradiating with only ultraviolet light. Furthermore, the water splitting reaction did not occur under visible light irradiation, which suggests that a Z-scheme-type water splitting reaction, that is, a two-step photoexcitation mechanism similar to that occuring in plant photosynthesis, proceeded on PtOx/TIPS-PEN/KTa(Zr)O-3.

    DOI： 10.1021/acs.jpcc.2c02532

    Web of Science

    Scopus

    researchmap

  • Enhanced performance of a Li-ion rechargeable battery at low temperatures: Use of 3,3,3-trifluoropropyl acetate as an electrolyte additive

    Nagano, H; Kim, H; Ikeda, S; Miyoshi, S; Watanabe, M; Ishihara, T

    ELECTROCHEMICAL SCIENCE ADVANCES   2 ( 3 )   2022.6   （ ISSN:2698-5977 ）

    　More details

    Publisher：Electrochemical Science Advances  

    The addition of 3,3,3-trifluoropropyl acetate (TFPA) to electrolyte in a Li-ion rechargeable battery (LIB) provides a means for increasing the discharge performance at low temperatures as a result of the formation of a superior solid electrolyte interphase (SEI) on the graphite anode. For instance, the addition of 2 wt% TFPA to the electrolyte significantly increased the cycle stability and the discharge capacities at low temperatures (-10°C) even at current rates of 3 C. The SEI films formed on the graphite anodes were characterized by electrochemical and spectroscopic techniques and by computational analysis. Although the formation of LiF on the anode has been recognized, present research revealed that the decomposition of TFPA on the anode surface resulted in the formation of an SEI layer consisting predominantly of organic fluorides. This layer suppressed the decomposition of the electrolyte resulting in a decreased anode impedance and an increase in cycle stability and discharge capacity at low temperatures.

    DOI： 10.1002/elsa.202100062

    Web of Science

    Scopus

  • Mixing nitrogen-containing compounds for synthesis of porous boron nitride for improved porosity, surface functionality, and solid base catalytic activity

    Atsushi Takagaki, Shohei Nakamura, Shu Ashimura, Masaaki Yoshida, Jun Tae Song, Motonori Watanabe, Shigenobu Hayashi, Tatsumi Ishihara

    APPLIED CATALYSIS A-GENERAL   638   2022.5   （ ISSN:0926-860X eISSN:1873-3875 ）

    　More details

    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER  

    Porous boron nitride was synthesized using boric acid with urea and/or hexamethylenetetramine (HMTA) via pyrolysis method. X-ray diffraction and Fourier transform infrared measurements indicated that the synthesized boron nitride has a turbostratic structure with both amino and hydroxyl group on the surface. The synthesis using a mixture of two nitrogen-containing precursors was found to not only significantly increase the porosity, but also improve the surface functionality. X-ray photoelectron spectroscopy and B K-edge and O K-edge X-ray absorption fine structure measurements revealed that the proportion of amino and hydroxyl groups on the surface increased with increasing concentration of HMTA during synthesis. Solid-state 11B nuclear magnetic resonance spectroscopy indicated that all samples contained trigonal B-N, trigonal B-O and tetrahedral B-O sites, and that samples prepared with high concentrations of HMTA had less tetrahedral B-O sites, suppressing the formation of BOx species as byproducts. Solid base catalytic activity was evaluated through Knoevenagel condensation, and the catalytic performance was significantly improved by synthesizing boron nitride catalyst using a mixture of the two nitrogen-containing precursors. The enhancement of the activity was influenced by the development of the pore structure as well as the emergence of functional groups on the surface.

    DOI： 10.1016/j.apcata.2022.118635

    Web of Science

    Scopus

    researchmap

  • Defective high-entropy oxide photocatalyst with high activity for CO2 conversion

    Akrami, S; Murakami, Y; Watanabe, M; Ishihara, T; Arita, M; Fuji, M; Edalati, K

    APPLIED CATALYSIS B-ENVIRONMENTAL   303   2022.4   （ ISSN:0926-3373 eISSN:1873-3883 ）

    　More details

  • Ethylene Carbonate (EC)-Propyl Acetate (PA) Based Electrolyte for Low Temperature Performance of Li-Ion Rechargeable Batteries

    Hiroki Nagano, Hackho Kim, Suguru Ikeda, Seiji Miyoshi, Motonori Watanabe, Tatsumi Ishihara

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   94 ( 9 )   2202 - 2209   2021.9

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1246/bcsj.20210185

  • Heptacene: Synthesis and Its Hole-Transfer Property in Stable Thin Films

    Takaaki Miyazaki, Motonori Watanabe, Toshinori Matsushima, Ching-Ting Chien, Chihaya Adachi, Shih-Sheng Sun, Hiroyuki Furuta, Tahsin J. Chow

    CHEMISTRY-A EUROPEAN JOURNAL   27 ( 41 )   10677 - 10684   2021.7

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/chem.202100936

  • High-entropy oxynitride as a low-bandgap and stable photocatalyst for hydrogen production

    Parisa Edalati, Xiao-Feng Shen, Motonori Watanabe, Tatsumi Ishihara, Makoto Arita, Masayoshi Fuji, Kaveh Edalati

    JOURNAL OF MATERIALS CHEMISTRY A   9 ( 26 )   15076 - 15086   2021.7

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/d1ta03861c

  • A novel aqueous dual-ion battery using concentrated bisalt electrolyte

    Huan Li, Takuya Kurihara, Dengyao Yang, Motonori Watanabe, Tatsumi Ishihara

    ENERGY STORAGE MATERIALS   38   454 - 461   2021.6

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.ensm.2021.03.029

  • An effect of crystallographic distortion on carrier mobility in poly(3-hexylthiophene) thin films

    Tatsuki Abe, Daisuke Kawaguchi, Motonori Watanabe, Taiki Hoshino, Tatsumi Ishihara, Keiji Tanaka

    APPLIED PHYSICS LETTERS   118 ( 18 )   2021.5

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1063/5.0041881

  • [2.2]Paracyclophane-based hole-transporting materials for perovskite solar cells

    Yin-Sheng Lin, Hsin Li, Wen-Sheng Yu, Szu-Tan Wang, Yi-Min Chang, Tsung-Hsin Liu, Shao-Sian Li, Motonori Watanabe, Hsiao-Han Chiu, Di-Yan Wang, Yuan Jay Chang

    JOURNAL OF POWER SOURCES   491   2021.4

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.jpowsour.2021.229543

  • Hexafluorophosphate-Bis(trifluoromethanesulfonyl)imide anion co-intercalation for increased performance of dual-carbon battery using mixed salt electrolyte

    Jose C. Madrid Madrid, Kotaro Nakamura, Keisuke Inda, Lukas Haneke, Andreas Heckmann, Joop Enno Frerichs, Michael Ryan Hansen, Tobias Placke, Martin Winter, Motonori Watanabe, Atsushi Takagaki, Taner Akbay, Tatsumi Ishihara

    JOURNAL OF POWER SOURCES   479   2020.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.jpowsour.2020.229084

  • Tensile strain for band engineering of SrTiO3 for increasing photocatalytic activity to water splitting

    Yoonyoung Kim, Motonori Watanabe, Junko Matsuda, Jun Tae Song, Atsushi Takagaki, Aleksandar Staykov, Tatsumi Ishihara

    APPLIED CATALYSIS B-ENVIRONMENTAL   278   2020.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.apcatb.2020.119292

  • Porous Boron Nitride as a Weak Solid Base Catalyst

    Shohei Nakamura, Atsushi Takagaki, Motonori Watanabe, Kanta Yamada, Masaaki Yoshida, Tatsumi Ishihara

    CHEMCATCHEM   12 ( 23 )   6033 - 6039   2020.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/cctc.202001435

  • Photo-biohydrogen Production by Photosensitization with Biologically Precipitated Cadmium Sulfide in Hydrogen-Forming RecombinantEscherichia coli

    Yuki Honda, Yuka Shinohara, Motonori Watanabe, Tatsumi Ishihara, Hiroshi Fujii

    CHEMBIOCHEM   21 ( 23 )   3389 - 3397   2020.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/cbic.202000383

  • Enhancement of solid base activity for porous boron nitride catalysts by controlling active structure using post treatment

    Atsushi Takagaki, Shohei Nakamura, Motonori Watanabe, Yoonyoung Kim, Jun Tae Song, Keiko Jimura, Kanta Yamada, Masaaki Yoshida, Shigenobu Hayashi, Tatsumi Ishihara

    APPLIED CATALYSIS A-GENERAL   608   2020.11

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.apcata.2020.117843

  • Novel black bismuth oxide (Bi2O3) with enhanced photocurrent generation, produced by high-pressure torsion straining Invited Reviewed International journal

    Ikuro Fujita, Parisa Edalati, Qing Wang, Motonori Watanabe, Makoto Arita, Shinji Munetoh, Tatsumi Ishihara, Kaveh Edalati

    Scripta Materialia   187   366 - 370   2020.10

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： https://doi.org/10.1016/j.scriptamat.2020.06.052

  • Novel black bismuth oxide (Bi2O3) with enhanced photocurrent generation, produced by high-pressure torsion straining

    Ikuro Fujita, Parisa Edalati, Qing Wang, Motonori Watanabe, Makoto Arita, Shinji Munetoh, Tatsumi Ishihara, Kaveh Edalati

    SCRIPTA MATERIALIA   187   366 - 370   2020.10

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.scriptamat.2020.06.052

  • Highly correlation of CO2 reduction selectivity and surface electron Accumulation A case study of Au-MoS2 and Ag-MoS2 catalyst Reviewed

    Songmei Sun, Qi An, Motonori Watanabe, Junfang Cheng, Hack Ho Kim, Taner Akbay, Atsushi Takagaki, Tatsumi Ishihara

    Applied Catalysis B: Environmental   271   2020.8

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.apcatb.2020.118931

  • Highly correlation of CO2 reduction selectivity and surface electron Accumulation: A case study of Au-MoS2 and Ag-MoS2 catalyst

    Songmei Sun, Qi An, Motonori Watanabe, Junfang Cheng, Hack Ho Kim, Taner Akbay, Atsushi Takagaki, Tatsumi Ishihara

    APPLIED CATALYSIS B-ENVIRONMENTAL   271   2020.8

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.apcatb.2020.118931

  • Scandium and copper co-doping effect on stability and activity to the NO direct decomposition of Ba3Y4O9

    Siman Fang, Atsushi Takagaki, Motonori Watanabe, Jun Tae Song, Tatsumi Ishihara

    APPLIED CATALYSIS A-GENERAL   602   2020.7

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.apcata.2020.117743

  • Z-scheme-type conductive-polymer-P3HT/KTa(Zr)O-3 heterojunction composites for enhancing the photocatalytic activity of water splitting

    Yuta Koganemaru, Yoonyoung Kim, Motonori Watanabe, Atsushi Takagaki, Tatsumi Ishihara

    APPLIED CATALYSIS A-GENERAL   602   2020.7

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.apcata.2020.117737

  • High-pressure torsion to induce oxygen vacancies in nanocrystals of magnesium oxide Enhanced light absorbance, photocatalysis and significance in geology Reviewed

    Ikuro Fujita, Kaveh Edalati, Qing Wang, Makoto Arita, Motonori Watanabe, Shinji Munetoh, Tatsumi Ishihara, Zenji Horita

    Materialia   11   2020.6

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.mtla.2020.100670

  • Visible-Light Photocurrent in Nanostructured High-Pressure TiO2-II (Columbite) Phase

    Qing Wang, Motonori Watanabe, Kaveh Edalati

    JOURNAL OF PHYSICAL CHEMISTRY C   124 ( 25 )   13930 - 13935   2020.6

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.jpcc.0c03923

  • Photobiocatalytic H(2)evolution of GaN:ZnO and [FeFe]-hydrogenase recombinantEscherichia coli

    Nuttavut Kosem, Yuki Honda, Motonori Watanabe, Atsushi Takagaki, Zahra Pourmand Tehrani, Fatima Haydous, Thomas Lippert, Tatsumi Ishihara

    CATALYSIS SCIENCE & TECHNOLOGY   10 ( 12 )   4042 - 4052   2020.6

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/d0cy00128g

  • High-pressure torsion to induce oxygen vacancies in nanocrystals of magnesium oxide: Enhanced light absorbance, photocatalysis and significance in geology

    Ikuro Fujita, Kaveh Edalati, Qing Wang, Makoto Arita, Motonori Watanabe, Shinji Munetoh, Tatsumi Ishihara, Zenji Horita

    MATERIALIA   11   2020.6

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.mtla.2020.100670

  • Pyridyl-anchored type bodipy sensitizer-tio2 photocatalyst for enhanced visible light-driven photocatalytic hydrogen production Reviewed

    Xiao Feng Shen, Motonori Watanabe, Atsushi Takagaki, Jun Tae Song, Tatsumi Ishihara

    Catalysts   10 ( 5 )   2020.5

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3390/catal10050535

  • Pyridyl-Anchored Type BODIPY Sensitizer-TiO2 Photocatalyst for Enhanced Visible Light-Driven Photocatalytic Hydrogen Production

    Xiao-Feng Shen, Motonori Watanabe, Atsushi Takagaki, Jun Tae Song, Tatsumi Ishihara

    CATALYSTS   10 ( 5 )   2020.5

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3390/catal10050535

  • Characteristics of crystalline sputtered LaFeO3 thin films as photoelectrochemical water splitting photocathodes

    Min-Kyu Son, Hyunwoong Seo, Motonori Watanabe, Masaharu Shiratani, Tatsumi Ishihara

    NANOSCALE   12 ( 17 )   9653 - 9660   2020.5

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/d0nr01762k

  • The direct decomposition of NO into N2 and O2 over copper doped Ba3Y4O9 Reviewed

    Siman Fang, Atsushi Takagaki, Motonori Watanabe, Tatsumi Ishihara

    Catalysis Science and Technology   10 ( 8 )   2513 - 2522   2020.4

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/d0cy00194e

  • The direct decomposition of NO into N-2 and O-2 over copper doped Ba3Y4O9

    Siman Fang, Atsushi Takagaki, Motonori Watanabe, Tatsumi Ishihara

    CATALYSIS SCIENCE & TECHNOLOGY   10 ( 8 )   2513 - 2522   2020.4

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/d0cy00194e

  • Enhanced photocatalytic hydrogen production on GaN–ZnO oxynitride by introduction of strain-induced nitrogen vacancy complexes Reviewed

    185   149 - 156   2020.2

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    Oxynitrides are considered as new potential candidates for photocatalysis due to their lower bandgap compared with traditional oxide photocatalysts. However, the formation of native nitrogen monovacancies during the synthesis of oxynitrides reduces their photocatalytic activity due to the vacancy-induced electron/hole recombination. This study shows that a transition from the native nitrogen monovacancies to the nitrogen-based vacancy complexes in a GaN–ZnO oxynitride not only diminishes the recombination but also enhances the photocatalytic hydrogen production. Here, the vacancy complexes are introduced by mechanical straining via the high-pressure torsion (HPT) method and it is shown that the vacancy complexes reduce the bandgap and increase the over-potential for hydrogen production on the conduction band. The current results introduce a simple but effective approach to turn the nitrogen vacancies to favorable defects for photocatalysis.

    DOI： 10.1016/j.actamat.2019.12.007

  • Photocatalytic hydrogen generation on low-bandgap black zirconia (ZrO2) produced by high-pressure torsion

    Qing Wang, Kaveh Edalati, Yuta Koganemaru, Shohei Nakamura, Motonori Watanabe, Tatsumi Ishihara, Zenji Horita

    JOURNAL OF MATERIALS CHEMISTRY A   8 ( 7 )   3643 - 3650   2020.2

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c9ta11839j

  • Improved Photocatalytic Hydrogen Evolution on Tantalate Perovskites CsTaO3 and LiTaO3 by Strain-Induced Vacancies

    Kaveh Edalati, Keisuke Fujiwara, Shuhei Takechi, Qing Wang, Makoto Arita, Motonori Watanabe, Xavier Sauvage, Tatsumi Ishihara, Zenji Horita

    ACS APPLIED ENERGY MATERIALS   3 ( 2 )   1710 - 1718   2020.2

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsaem.9b02197

  • Enhanced photocatalytic hydrogen production on GaN-ZnO oxynitride by introduction of strain-induced nitrogen vacancy complexes

    Kaveh Edalati, Ryoko Uehiro, Shuhei Takechi, Qing Wang, Makoto Arita, Motonori Watanabe, Tatsumi Ishihara, Zenji Horita

    ACTA MATERIALIA   185   149 - 156   2020.2

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.actamat.2019.12.007

  • Photocatalytic hydrogen generation on low-bandgap black zirconia (ZrO2) produced by high-pressure torsion Reviewed

    Qing Wang, Kaveh Edalati, Yuta Koganemaru, Shohei Nakamura, Motonori Watanabe, Tatsumi Ishihara, Zenji Horita

    Journal of Materials Chemistry A   8 ( 7 )   3643 - 3650   2020.2

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c9ta11839j

  • Improved Photocatalytic Hydrogen Evolution on Tantalate Perovskites CsTaO3 and LiTaO3 by Strain-Induced Vacancies Reviewed

    Kaveh Edalati, Keisuke Fujiwara, Shuhei Takechi, Qing Wang, Makoto Arita, Motonori Watanabe, Xavier Sauvage, Tatsumi Ishihara, Zenji Horita

    ACS Applied Energy Materials   3 ( 2 )   1710 - 1718   2020.2

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsaem.9b02197

  • Chemo-mechanical strain effects on band engineering of the TiO2 photocatalyst for increasing the water splitting activity Reviewed

    Yoonyoung Kim, Motonori Watanabe, Junko Matsuda, Aleksandar Staykov, Hajime Kusaba, Atsushi Takagaki, Taner Akbay, Tatsumi Ishihara

    Journal of Materials Chemistry A   8 ( 3 )   1335 - 1346   2020.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c9ta11048h

  • Chemo-mechanical strain effects on band engineering of the TiO2 photocatalyst for increasing the water splitting activity

    Yoonyoung Kim, Motonori Watanabe, Junko Matsuda, Aleksandar Staykov, Hajime Kusaba, Atsushi Takagaki, Taner Akbay, Tatsumi Ishihara

    JOURNAL OF MATERIALS CHEMISTRY A   8 ( 3 )   1335 - 1346   2020.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c9ta11048h

  • Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining Reviewed

    K. Edalati, I. Fujita, Shuhei Takechi, Yuki Nakashima, Kazuki Kumano, Hadi Razavi-Khosroshahi, Makoto Arita, Motonori Watanabe, Xavier Sauvage, T. Akbay, Tatsumi Ishihara, Masayoshi Fuji, Z. Horita

    Scripta Materialia   173   120 - 124   2019.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.scriptamat.2019.08.011

  • Spark Plasma Sintering Treatment for Introduction of Oxygen Vacancy in Pt Dispersed SrTiO3 for Increasing Photocatalytic Water Splitting Activity

    Yoonyoung Kim, Motonori Watanabe, Atsushi Takagaki, Junko Matsuda, Tatsumi Ishihara

    CHEMCATCHEM   11 ( 24 )   6270 - 6274   2019.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/cctc.201901549

  • Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining

    Kaveh Edalati, Ikuro Fujita, Shuhei Takechi, Yuki Nakashima, Kazuki Kumano, Hadi Razavi-Khosroshahi, Makoto Arita, Motonori Watanabe, Xavier Sauvage, Taner Akbay, Tatsumi Ishihara, Masayoshi Fuji, Zenji Horita

    SCRIPTA MATERIALIA   173   120 - 124   2019.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.scriptamat.2019.08.011

  • Spark Plasma Sintering Treatment for Introduction of Oxygen Vacancy in Pt Dispersed SrTiO3 for Increasing Photocatalytic Water Splitting Activity Reviewed

    Yoonyoung Kim, Motonori Watanabe, Atsushi Takagaki, Junko Matsuda, Tatsumi Ishihara

    ChemCatChem   11 ( 24 )   6270 - 6274   2019.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/cctc.201901549

  • Electrocatalytic hydrogen production using [FeFe]-hydrogenase mimics based on tetracene derivatives

    Motonori Watanabe, Kenta Goto, Takaaki Miyazaki, Masahiko Shibahara, Yuan Jay Chang, Tahsin J. Chow, Tatsumi Ishihara

    NEW JOURNAL OF CHEMISTRY   43 ( 35 )   13810 - 13815   2019.9

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c9nj02790d

  • Single-Electron-Trapped Oxygen Vacancy on Ultrathin WO3·0.33H2O {100} Facets Suppressing Backward Reaction for Promoted H2 Evolution in Pure Water Splitting Reviewed

    10 ( 11 )   2998 - 3005   2019.6

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    Solar water splitting to produce hydrogen is a promising solution for global energy issues. One of the main bottlenecks in this technology is the spontaneous fast backward reaction (2H2 + O2 → H2O, ΔG < 0), limiting the solar energy conversion efficiency. How to suppress backward reaction is vitally important but rarely reported. Here we found that single-electron-trapped oxygen vacancy (Vo·) can suppress spontaneous backward reaction in pure water splitting. Taking WO3·0.33H2O catalyst as an example, ultrathin WO3·0.33H2O {100} facets with large amount of surface Vo· realized a continuous H2 evolution from pure water splitting with a productivity of 9.9 μmol/g·h without the assistance of any sacrifice agent and noble metal cocatalyst. Quantum chemical calculations revealed that the backward-reaction suppression ability of Vo· is attributed to the high concentration of localized electrons around Vo·, stimulating unidirectional simultaneous water dissociation into H and OH under light irradiation.

    DOI： 10.1021/acs.jpclett.9b01032

  • Single-Electron-Trapped Oxygen Vacancy on Ultrathin WO3 center dot 0.33H(2)O {100} Facets Suppressing Backward Reaction for Promoted H-2 Evolution in Pure Water Splitting

    Songmei Sun, Ji Wu, Motonori Watanabe, Taner Akbay, Tatsumi Ishihara

    JOURNAL OF PHYSICAL CHEMISTRY LETTERS   10 ( 11 )   2998 - 3005   2019.6

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.jpclett.9b01032

  • Synergistic Enhancement of H 2 and CH 4 Evolution by CO 2 Photoreduction in Water with Reduced Graphene Oxide-Bismuth Monoxide Quantum Dot Catalyst Reviewed

    Songmei Sun, Motonori Watanabe, Pangpang Wang, Tatsumi Ishihara

    ACS Applied Energy Materials   2 ( 3 )   2104 - 2112   2019.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsaem.8b02153

  • Synergistic Enhancement of H-2 and CH4 Evolution by CO2 Photoreduction in Water with Reduced Graphene Oxide-Bismuth Monoxide Quantum Dot Catalyst

    Songmei Sun, Motonori Watanabe, Pangpang Wang, Tatsumi Ishihara

    ACS APPLIED ENERGY MATERIALS   2 ( 3 )   2104 - 2112   2019.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsaem.8b02153

  • Synthesis of perfluoroalkyl gelators and their selective gelation ability for fluorinated solvents 1 Reviewed

    Toshiaki Shimasaki, Yuki Ohno, Mao Tanaka, Masato Amano, Yuta Sasaki, Hirobumi Shibata, Motonori Watanabe, Naozumi Teramoto, Mitsuhiro Shibata

    Bulletin of the Chemical Society of Japan   97 - 104   2019.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1246/bcsj.20180261

  • Synthesis of Perfluoroalkyl Gelators and Their Selective Gelation Ability for Fluorinated Solvents

    Toshiaki Shimasaki, Yuki Ohno, Mao Tanaka, Masato Amano, Yuta Sasaki, Hirobumi Shibata, Motonori Watanabe, Naozumi Teramoto, Mitsuhiro Shibata

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   92 ( 1 )   97 - 104   2019.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1246/bcsj.20180261

  • Electrocatalytic hydrogen production using[FeFe]-hydrogenase mimics based on tetracene derivatives Reviewed

    Motonori Watanabe, Kenta Goto, Takaaki Miyazaki, Masahiko Shibahara, Yuan Jay Chang, Tahsin J. Chow, Tatsumi Ishihara

    New Journal of Chemistry   43 ( 35 )   13810 - 13815   2019.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c9nj02790d

  • Ultra-low friction of polyethylenimine / molybdenum disulfide (PEI/MoS2)15 thin films in dry nitrogen atmosphere and the effect of heat treatment Reviewed

    Prabakaran Saravanan, Roman Selyanchyn, Motonori Watanabe, Shigenori Fujikawa, Hiroyoshi Tanaka, Stephen Matthew Lyth, Joichi Sugimura

    Tribology International   127   255 - 263   2018.11

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.triboint.2018.06.003

  • Visible Light-Driven Dye-Sensitized Photocatalytic Hydrogen Production by Porphyrin and its Cyclic Dimer and Trimer: Effect of Multi-Pyridyl-Anchoring Groups on Photocatalytic Activity and Stability

    Motonori Watanabe, Songmei Sun, Tatsumi Ishihara, Takuya Kamimura, Masato Nishimura, Fumito Tani

    ACS APPLIED ENERGY MATERIALS   1 ( 11 )   6072 - 6081   2018.11

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsaem.8b01113

  • Ultra-low friction of polyethylenimine / molybdenum disulfide (PEI/MoS2)(15) thin films in dry nitrogen atmosphere and the effect of heat treatment

    Prabakaran Saravanan, Roman Selyanchyn, Motonori Watanabe, Shigenori Fujikawa, Hiroyoshi Tanaka, Stephen Matthew Lyth, Joichi Sugimura

    TRIBOLOGY INTERNATIONAL   127   255 - 263   2018.11

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.triboint.2018.06.003

  • Visible Light-Driven Dye-Sensitized Photocatalytic Hydrogen Production by Porphyrin and its Cyclic Dimer and Trimer Effect of Multi-Pyridyl-Anchoring Groups on Photocatalytic Activity and Stability Reviewed

    Motonori Watanabe, Songmei Sun, Tatsumi Ishihara, Takuya Kamimura, Masato Nishimura, Fumito Tani

    ACS Applied Energy Materials   1 ( 11 )   6072 - 6081   2018.11

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsaem.8b01113

  • Donor-Donor'-Acceptor Triads Based on [3.3]Paracyclophane with a 1,4-Dithiafulvene Donor and a Cyanomethylene Acceptor: Synthesis, Structure, and Electrochemical and Photophysical Properties

    Katsuya Sako, Tomoya Hasegawa, Hiroyuki Onda, Michito Shiotsuka, Motonori Watanabe, Teruo Shinmyozu, Sachiko Tojo, Mamoru Fujitsuka, Tetsuro Majima, Yasukazu Hirao, Takashi Kubo, Tetsuo Iwanaga, Shinji Toyota, Hiroyuki Takemura

    CHEMISTRY-A EUROPEAN JOURNAL   24 ( 44 )   11407 - 11416   2018.8

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/chem.201801774

  • A Cocatalyst that Stabilizes a Hydride Intermediate during Photocatalytic Hydrogen Evolution over a Rhodium-Doped TiO 2 Nanosheet Reviewed

    Shintaro Ida, Kenta Sato, Tetsuya Nagata, Hidehisa Hagiwara, Motonori Watanabe, Namhoon Kim, Yoshihito Shiota, Michio Koinuma, Sakae Takenaka, Takaaki Sakai, Elif Ertekin, Tatsumi Ishihara

    Angewandte Chemie - International Edition   57 ( 29 )   9073 - 9077   2018.7

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/anie.201803214

  • A Cocatalyst that Stabilizes a Hydride Intermediate during Photocatalytic Hydrogen Evolution over a Rhodium-Doped TiO2 Nanosheet

    Shintaro Ida, Kenta Sato, Tetsuya Nagata, Hidehisa Hagiwara, Motonori Watanabe, Namhoon Kim, Yoshihito Shiota, Michio Koinuma, Sakae Takenaka, Takaaki Sakai, Elif Ertekin, Tatsumi Ishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   57 ( 29 )   9073 - 9077   2018.7

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/anie.201803214

  • Synthesis and properties of fully conjugated macrocycles composed of m-diethynylene-phenylene-bridged two dibenzofuran, dibenzothiophene and carbazole units Reviewed

    Toshiaki Shimasaki, Shunsuke Okajima, Rino Ishikawa, Shinji Kawaguchi, Takeshi Akimoto, Naoto Asano, Tetsuo Iwanaga, Motonori Watanabe, Naozumi Teramoto, Mitsuhiro Shibata

    Tetrahedron   74 ( 20 )   2454 - 2465   2018.5

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tet.2018.03.072

  • Ultrathin WO3 center dot 0.33H(2)O Nanotubes for CO2 Photoreduction to Acetate with High Selectivity

    Songmei Sun, Motonori Watanabe, Ji Wu, Qi An, Tatsumi Ishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   140 ( 20 )   6474 - 6482   2018.5

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jacs.8b03316

  • Synthesis and properties of fully conjugated macrocycles composed of m-diethynylene-phenylene-bridged two dibenzofuran, dibenzothiophene and carbazole units

    Toshiaki Shimasaki, Shunsuke Okajima, Rino Ishikawa, Shinji Kawaguchi, Takeshi Akimoto, Naoto Asano, Tetsuo Iwanaga, Motonori Watanabe, Naozumi Teramoto, Mitsuhiro Shibata

    TETRAHEDRON   74 ( 20 )   2454 - 2465   2018.5

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tet.2018.03.072

  • Ultrathin WO3·0.33H2O Nanotubes for CO2 Photoreduction to Acetate with High Selectivity Reviewed

    140 ( 20 )   6474 - 6482   2018.5

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    Artificial photosynthesis from CO2 reduction is severely hampered by the kinetically challenging multi-electron reaction process. Oxygen vacancies (Vo) with abundant localized electrons have great potential to overcome this limitation. However, surface Vo usually have low concentrations and are easily oxidized, causing them to lose their activities. For practical application of CO2 photoreduction, fabricating and enhancing the stability of Vo on semiconductors is indispensable. Here we report the first synthesis of ultrathin WO3·0.33H2O nanotubes with a large amount of exposed surface Vo sites, which can realize excellent and stable CO2 photoreduction to CH3COOH in pure water under solar light. The selectivity for acetum generation is up to 85%, with an average productivity of about 9.4 μmol g-1 h-1. More importantly, Vo in the catalyst are sustainable, and their concentration was not decreased even after 60 h of reaction. Quantum chemical calculations and in situ DRIFT studies revealed that the main reaction pathway might be CO2 → •COOH → (COOH)2 → CH3COOH.

    DOI： 10.1021/jacs.8b03316

  • Donor-Donor'-Acceptor Triads Based on [3.3]Paracyclophane with a 1,4-Dithiafulvene Donor and a Cyanomethylene Acceptor Synthesis, Structure, and Electrochemical and Photophysical Properties Reviewed

    Katsuya Sako, Tomoya Hasegawa, Hiroyuki Onda, Michito Shiotsuka, Motonori Watanabe, Teruo Shinmyozu, Sachiko Tojo, Mamoru Fujitsuka, Tetsuro Majima, Yasukazu Hirao, Takashi Kubo, Tetsuo Iwanaga, Shinji Toyota, Hiroyuki Takemura

    Chemistry - A European Journal   2018.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/chem.201801774

  • Synthesis and physical properties of brominated hexacene and hole-transfer properties of thin-film transistors Reviewed

    Motonori Watanabe, Takaaki Miyazaki, Toshinori Matsusima, Junko Matsuda, Ching Ting Chein, Masahiko Shibahara, Chihaya Adachi, Shih Sheng Sun, Tahsin J. Chow, Tatsumi Ishihara

    RSC Advances   8 ( 24 )   13259 - 13265   2018.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c7ra13632c

  • [FeFe]-Hydrogenase and its organic molecule mimics-Artificial and bioengineering application for hydrogenproduction

    Motonori Watanabe, Yuki Honda, Hidehisa Hagiwara, Tatsumi Ishihara

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS   33   1 - 26   2017.12

    　More details

    Language：English  

    DOI： 10.1016/j.jphotochemrev.2017.09.001

  • Dye-sensitized photocatalyst for effective water splitting catalyst

    Motonori Watanabe

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   18 ( 1 )   705 - 723   2017.10

    　More details

    Language：English  

    DOI： 10.1080/14686996.2017.1375376

  • Effects of preparation condition on the photocatalytic activity of porphyrin-modified GaN:ZnO for water splitting Reviewed

    Hidehisa Hagiwara, Ryota Kakigi, Shuhei Takechi, Motonori Watanabe, Satoshi Hinokuma, Shintaro Ida, Tatsumi Ishihara

    Surface and Coatings Technology   324   601 - 606   2017.9

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.surfcoat.2016.10.054

  • Effects of preparation condition on the photocatalytic activity of porphyrin-modified GaN:ZnO for water splitting

    Hidehisa Hagiwara, Ryota Kakigi, Shuhei Takechi, Motonori Watanabe, Satoshi Hinokuma, Shintaro Ida, Tatsumi Ishihara

    SURFACE & COATINGS TECHNOLOGY   324   601 - 606   2017.9

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.surfcoat.2016.10.054

  • Inorganic/whole-cell biohybrid photocatalyst for highly efficient hydrogen production from water

    Yuki Honda, Motonori Watanabe, Hidehisa Hagiwara, Shintaro Ida, Tatsumi Ishihara

    APPLIED CATALYSIS B-ENVIRONMENTAL   210   400 - 406   2017.8

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.apcatb.2017.04.015

  • Ethynylene-Bridged Conjugate Carbazole Trimers Synthesis and their Structural, Photophysical, and Electrochemical Properties Reviewed

    Toshiaki Shimasaki, Ryosuke Iwasawa, Motonori Watanabe, Naozumi Teramoto, Mitsuhiro Shibata

    Asian Journal of Organic Chemistry   6 ( 7 )   841 - 851   2017.7

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/ajoc.201700088

  • Ethynylene-Bridged Conjugate Carbazole Trimers: Synthesis and their Structural, Photophysical, and Electrochemical Properties

    Toshiaki Shimasaki, Ryosuke Iwasawa, Motonori Watanabe, Naozumi Teramoto, Mitsuhiro Shibata

    ASIAN JOURNAL OF ORGANIC CHEMISTRY   6 ( 7 )   841 - 851   2017.7

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/ajoc.201700088

  • Photoelectrochemical H-2 evolution using TiO2-coated CaFe2O4 without an external applied bias under visible light irradiation at 470 nm based on device modeling

    Shintaro Ida, Kara Kearney, Takamitsu Futagami, Hidehisa Hagiwara, Takaaki Sakai, Motonori Watanabe, Angus Rockett, Tatsumi Ishihara

    SUSTAINABLE ENERGY & FUELS   1 ( 2 )   280 - 287   2017.4

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c7se00084g

  • Inorganic/whole-cell biohybrid photocatalyst for highly efficient hydrogen production from water Reviewed

    Yuki Honda, Motonori Watanabe, Hidehisa Hagiwara, Shintaro Ida, Tatsumi Ishihara

    Applied Catalysis B: Environmental   210   400 - 406   2017.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.apcatb.2017.04.015

  • Triphenylamine derivatives and the lithium-ion capture of [3.3] cyclophane used in organic dye-sensitized solar cells

    Yu-Hsiang Chiu, Masahiko Shibahara, Rui-Yu Huang, Motonori Watanabe, Zhong-Sheng Wang, Yu-Jen Hsiao, Bo-Fong Chang, Ting-Hsuan Chiang, Yuan Jay Chang

    DYES AND PIGMENTS   136   761 - 772   2017.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.dyepig.2016.09.043

  • Synthesis of 1,2-Bis(2-aryl-1H-indol-3-yl)ethynes via 5-exo-Digonal Double Cyclization Reactions of 1,4-Bis(2-isocyanophenyl)buta-1,3-diyne with Aryl Grignard Reagents

    Rino Ishikawa, Ryosuke Iwasawa, Yuichiro Takiyama, Tomokazu Yamauchi, Tetsuo Iwanaga, Makoto Takezaki, Motonori Watanabe, Naozumi Teramoto, Toshiaki Shimasaki, Mitsuhiro Shibata

    JOURNAL OF ORGANIC CHEMISTRY   82 ( 1 )   652 - 663   2017.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.joc.6b02668

  • Overall Water Splitting on Dye-modified Inorganic Semiconductor Photocatalysts

    Hidehisa Hagiwara, Motonori Watanabe, Shintaro Ida, Tatsumi Isumara

    JOURNAL OF THE JAPAN PETROLEUM INSTITUTE   60 ( 1 )   10 - 18   2017.1

    　More details

    Language：English  

    DOI： 10.1627/jpi.60.10

  • Triphenylamine derivatives and the lithium-ion capture of [3.3]cyclophane used in organic dye-sensitized solar cells Reviewed

    Yu Hsiang Chiu, Masahiko Shibahara, Rui Yu Huang, Motonori Watanabe, Zhong Sheng Wang, Yu Jen Hsiao, Bo Fong Chang, Ting Hsuan Chiang, Yuan Jay Chang

    Dyes and Pigments   136   761 - 772   2017.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.dyepig.2016.09.043

  • Synthesis of 1,2-Bis(2-aryl-1H-indol-3-yl)ethynes via 5-exo-Digonal Double Cyclization Reactions of 1,4-Bis(2-isocyanophenyl)buta-1,3-diyne with Aryl Grignard Reagents Reviewed

    Rino Ishikawa, Ryosuke Iwasawa, Yuichiro Takiyama, Tomokazu Yamauchi, Tetsuo Iwanaga, Makoto Takezaki, Motonori Watanabe, Naozumi Teramoto, Toshiaki Shimasaki, Mitsuhiro Shibata

    Journal of Organic Chemistry   82 ( 1 )   652 - 663   2017.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.joc.6b02668

  • Photoelectrochemical H 2 evolution using TiO 2 -coated CaFe 2 O 4 without an external applied bias under visible light irradiation at 470 nm based on device modeling Reviewed

    Shintaro Ida, Kara Kearney, Takamitsu Futagami, Hidehisa Hagiwara, Takaaki Sakai, Motonori Watanabe, Angus Rockett, Tatsumi Ishihara

    Sustainable Energy and Fuels   1 ( 2 )   280 - 287   2017.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c7se00084g

  • 5,5 '-alkylsubsituted indigo for solution-processed optoelectronic devices

    Motonori Watanabe, Naoki Uemura, Shintaro Ida, Hidehisa Hagiwara, Kenta Goto, Tatsumi Ishihara

    TETRAHEDRON   72 ( 29 )   4280 - 4287   2016.7

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tet.2016.05.069

  • Synthesis of Dibromo[3.3]paracyclophanes

    Masahiko Shibahara, Motonori Watanabe, Takaaki Miyazaki, Kenta Goto, Teruo Shinmyozu

    SYNTHESIS-STUTTGART   48 ( 8 )   1197 - 1201   2016.4

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1055/s-0035-1560421

  • Effect of porphyrin molecular structure on water splitting activity of a KTaO3 photocatalyst Reviewed

    Hidehisa Hagiwara, Kohei Higashi, Motonori Watanabe, Ryota Kakigi, Shintaro Ida, Tatsumi Ishihara

    Catalysts   6 ( 3 )   2016.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3390/catal6030042

  • Effect of Porphyrin Molecular Structure on Water Splitting Activity of a KTaO3 Photocatalyst

    Hidehisa Hagiwara, Kohei Higashi, Motonori Watanabe, Ryota Kakigi, Shintaro Ida, Tatsumi Ishihara

    CATALYSTS   6 ( 3 )   2016.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3390/catal6030042

  • Synthesis of Dibromo[33]paracyclophanes Reviewed

    Masahiko Shibahara, Motonori Watanabe, Takaaki Miyazaki, Kenta Goto, Taisuke Matsumoto, Teruo Shinmyozu

    Synthesis (Germany)   48 ( 8 )   1197 - 1201   2016.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1055/s-0035-1560421

  • 5,5′-alkylsubsituted indigo for solution-processed optoelectronic devices Reviewed

    72 ( 29 )   4280 - 4287   2016.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    A series of alkylated indigos were synthesized. Alkylated indigos were characterized by NMR, mass spectrometry, absorption spectra, cyclic voltammetry, and density functional theory (DFT) calculations. Propyl and butyl group substituted indigo was most soluble in chloroform and 1,2-dicrolobenzene, and these solubility were 65–89 times increased as compared to the parent indigo. DFT calculations suggested that the presence of the alkyl chains at the 5.5′-position increases the energy of the highest occupied molecular orbital, while reducing the energy of the lowest unoccupied molecular orbital. This theoretical finding was in good agreement with the experimental results. Crystal structures obtained by X-ray diffraction showed one-dimensional pi–pi stacking. Alkylated molecules were converted to leuco structure, and these structures were then converted to the corresponding indigos in the film state. After deposition of the films on TiO2/FTO substrate, oxidative photocurrents were observed.

    DOI： 10.1016/j.tet.2016.05.069

  • Dual-carbon battery using high concentration LiPF6 in dimethyl carbonate (DMC) electrolyte Reviewed

    Seiji Miyoshi, Hiroki Nagano, Taro Fukuda, Takuya Kurihara, Motonori Watanabe, Shintaro Ida, Tatsumi Ishihara

    Journal of the Electrochemical Society   163 ( 7 )   A1206 - A1213   2016.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1149/2.0381607jes

  • Synthesis of bromo- and iodo-substituted pyromellitic diimide-based [2+2]- and [3+3]macrocycles, and their absorption spectra and electrochemical and inclusion properties Reviewed

    Md Ershad Halim, Arkasish Bandyopadhyay, Liansheng Sun, Keisuke Tao, Yogesh Shashikant Sangvikar, Takaaki Miyazaki, Motonori Watanabe, Keiko Ideta, Taisuke Matsumoto, Kenta Goto, Teruo Shinmyozu

    Tetrahedron Letters   56 ( 50 )   6970 - 6974   2015.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2015.10.070

  • Synthesis of bromo- and iodo-substituted pyromellitic diimide-based [2+2]- and [3+3]macrocycles, and their absorption spectra and electrochemical and inclusion properties

    Md. Ershad Halim, Arkasish Bandyopadhyay, Liansheng Sun, Keisuke Tao, Yogesh Shashikant Sangvikar, Takaaki Miyazaki, Motonori Watanabe, Keiko Ideta, Taisuke Matsumoto, Kenta Goto, Teruo Shinmyozu

    TETRAHEDRON LETTERS   56 ( 50 )   6970 - 6974   2015.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2015.10.070

  • Synthesis and Investigation of the Effect of Substitution on the Structure, Physical Properties, and Electrochemical Properties of Anthracenodifuran Derivatives Reviewed

    Motonori Watanabe, Yasutaka Doi, Hidehisa Hagiwara, Aleksandar Tsekov Staykov, Shintaro Ida, Taisuke Matsumoto, Teruo Shinmyozu, Tatsumi Ishihara

    Journal of Organic Chemistry   80 ( 18 )   9159 - 9166   2015.9

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.joc.5b01525

  • Synthesis and Investigation of the Effect of Substitution on the Structure, Physical Properties, and Electrochemical Properties of Anthracenodifuran Derivatives

    Motonori Watanabe, Yasutaka Doi, Hidehisa Hagiwara, Aleksandar Tsekov Stakov, Shintaro Ida, Taisuke Matsumoto, Teruo Shinmyozu, Tatsumi Ishihara

    JOURNAL OF ORGANIC CHEMISTRY   80 ( 18 )   9159 - 9166   2015.9

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.joc.5b01525

  • Synthesis and electronic properties of ferrocene-containing organic dyads Reviewed

    Motonori Watanabe, Yuan Jay Chang, Po Ting Chou, Aleksandar Tsekov Staykov, Masahiko Shibahara, Katsuya Sako, Tatsumi Ishihara, Tahsin J. Chow

    Tetrahedron Letters   56 ( 12 )   1548 - 1551   2015.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2015.02.012

  • The synthesis of 2-halopentacenes and their charge transport properties

    Ching-Ting Chien, Motonori Watanabe, Tahsin J. Chow

    TETRAHEDRON   71 ( 11 )   1668 - 1673   2015.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tet.2015.01.056

  • Synthesis and electronic properties of ferrocene-containing organic dyads

    Motonori Watanabe, Yuan Jay Chang, Po-Ting Chou, Aleksandar Staykov, Masahiko Shibahara, Katsuya Sako, Tatsumi Ishihara, Tahsin J. Chow

    TETRAHEDRON LETTERS   56 ( 12 )   1548 - 1551   2015.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2015.02.012

  • The synthesis of 2-halopentacenes and their charge transport properties Reviewed

    Ching Ting Chien, Motonori Watanabe, Tahsin J. Chow

    Tetrahedron   71 ( 11 )   1668 - 1673   2015.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tet.2015.01.056

  • Cycloaddition of hexacene and fullerene[60] Reviewed

    Wei Ting Su, Motonori Watanabe, Yuan Jay Chang, Po Ting Chou, Avijit Ghosh, Tahsin J. Chow

    Tetrahedron Letters   56 ( 9 )   1092 - 1095   2015.2

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2015.01.093

  • Cycloaddition of hexacene and fullerene[60]

    Wei-Ting Su, Motonori Watanabe, Yuan Jay Chang, Po-Ting Chou, Avijit Ghosh, Tahsin J. Chow

    TETRAHEDRON LETTERS   56 ( 9 )   1092 - 1095   2015.2

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2015.01.093

  • Impact of alkoxy chain length on carbazole-based, visible light-driven, dye sensitized photocatalytic hydrogen production Reviewed

    Motonori Watanabe, Hidehisa Hagiwara, Yudai Ogata, Aleksandar Tsekov Staykov, Sean R. Bishop, Nicola Helen Perry, Yuan Jay Chang, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

    Journal of Materials Chemistry A   3 ( 43 )   21713 - 21721   2015.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c5ta04991a

  • Structural properties of five- and six-layered [3.3]metacyclophanes Reviewed

    Masahiko Shibahara, Motonori Watanabe, Kenta Goto, Takaaki Miyazaki, Hua Zhang, Yuki Nakayama, Teruo Shinmyozu

    Tetrahedron Letters   55 ( 51 )   7089 - 7093   2014.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2014.10.151

  • Synthesis and Electronic and Photophysical Properties of [2.2]- and [3.3]Paracyclophane-Based Donor-Donor'-Acceptor Triads

    Takaaki Miyazaki, Masahiko Shibahara, Jun-ichi Fujishige, Motonori Watanabe, Kenta Goto, Teruo Shinmyozu

    JOURNAL OF ORGANIC CHEMISTRY   79 ( 23 )   11440 - 11453   2014.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jo5020273

  • Structural properties of five- and six-layered [3.3]metacyclophanes

    Masahiko Shibahara, Motonori Watanabe, Kenta Goto, Takaaki Miyazaki, Hua Zhang, Yuki Nakayama, Teruo Shinmyozu

    TETRAHEDRON LETTERS   55 ( 51 )   7089 - 7093   2014.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2014.10.151

  • Synthesis and electronic and photophysical properties of [2.2]- and [3.3]paracyclophane-based donor-donor′-acceptor triads Reviewed

    79 ( 23 )   11440 - 11453   2014.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    Three types of the donor(D)-donor′(D′)-acceptor(A) triads 1-6 with different D-A combinations, carbazole (Cz, D)-[n.n]PCP(D′)-1,8-naphthalimide (NI, A) (1-3), 10H-phenothiazine (PTZ, D)-[n.n]PCP(D′)-NI(A) (4, 5), and 10-methyl-10H-phenothiazine (Me-PTZ, D)-[2.2]PCP-2,1,3-benzothiadiazole (BTD, A) 6, were synthesized for the elucidation of their photophysical properties. The absorption spectra and electrochemical properties indicated that the chromophores (D, D′, and A) do not interact with each other in the ground state. Cz-(CH2)3-[2.2]PCP-(CH2)3-NI 1 and Cz-(CH2)3-[3.3]PCP-(CH2)3-NI 2 show an exciplex emission between the PCP and NI moieties in cyclohexane and the intensity of the band is much higher in 2 than in 1, whereas Cz-(CH2)2-[2.2]PCP-(CH2)2-NI 3 does not show any exciplex emission in cyclohexane. These results indicated that the combination of [3.3]PCP and a trimethylene chain is preferable for the exciplex formation. PTZ-(CH2)3-[2.2]PCP-(CH2)3-NI 4 shows a broad band at 519 nm in cyclohexane, which is associated with the formation of the exterplex band among the NI, [2.2]PCP, and PTZ moieties, while PTZ-(CH2)3-[3.3]PCP-(CH2)3-NI 5 does not show the band. Me-PTZ-(CH2)2-[2.2]PCP-(CH2)2-BTD 6 shows a broad fluorescence band due to both the BTD and PTZ moieties in cyclohexane. In CH3CN, the fluorescence spectra of 1-6 suggest the presence of a photoinduced charge separation process. The study of the photoinduced charge separation process will be soon reported elsewhere.

    DOI： 10.1021/jo5020273

  • Crystal structure of a four-layered [3.3](3,5)pyridinophane

    Masahiko Shibahara, Motonori Watanabe, Taisuke Matsumoto, Kenta Goto, Teruo Shinmyozu

    ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE   70   447 - +   2014.11

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S1600536814023691

  • Photoswitching of Conductance through Salicylidene Methylamine

    Aleksandar Staykov, Motonori Watanabe, Tatsumi Ishihara, Kazunari Yoshizawa

    JOURNAL OF PHYSICAL CHEMISTRY C   118 ( 47 )   27539 - 27548   2014.11

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jp5081884

  • Modification effects of meso-hexakis(pentafluorophenyl) [26]hexaphyrin aggregates on the photocatalytic water splitting Reviewed

    Hidehisa Hagiwara, Motonori Watanabe, Takeshi Daio, Shintaro Ida, Tatsumi Ishihara

    Chemical Communications   50 ( 83 )   12515 - 12518   2014.10

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c4cc05127k

  • N-confused phlorin: a stable dihydroporphyrin isomer containing a confused pyrrole ring

    Masatoshi Ishida, Kensuke Nakahara, Ryuichi Sakashita, Tomoya Ishizuka, Motonori Watanabe, Hidemitsu Uno, Atsuhiro Osuka, Hiroyuki Furuta

    JOURNAL OF PORPHYRINS AND PHTHALOCYANINES   18 ( 10-11 )   909 - 918   2014.10

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1142/S1088424614500692

  • Benzo[1,2-b:4,5-b ']dithiophene and benzo[1,2-b:4,5-b ']difuran based organic dipolar compounds for sensitized solar cells

    Yan-Zuo Lin, Chia-Wei Yeh, Po-Ting Chou, Motonori Watanabe, Yu-Hsuan Chang, Yuan Jay Chang, Tahsin J. Chow

    DYES AND PIGMENTS   109   81 - 89   2014.10

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.dyepig.2014.04.043

  • Crystal structure of (E)-2-cyano-3-(12-methyl-12H-benzo[b]phenothiazin-11-yl)acrylic acid

    Motonori Watanabe, Tatsumi Ishihara

    ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS   70   O1026 - +   2014.9

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S1600536814018388

  • Spacer effects in metal-free organic dyes for visible-light-driven dye-sensitized photocatalytic hydrogen production Reviewed

    Motonori Watanabe, Hidehisa Hagiwara, Aoi Iribe, Yudai Ogata, Kenta Shiomi, Aleksandar Tsekov Staykov, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

    Journal of Materials Chemistry A   2 ( 32 )   12952 - 12961   2014.8

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c4ta02720e

  • Spacer effects in metal-free organic dyes for visible-light-driven dye-sensitized photocatalytic hydrogen production

    Motonori Watanabe, Hidehisa Hagiwara, Aoi Iribe, Yudai Ogata, Kenta Shiomi, Aleksandar Staykov, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

    JOURNAL OF MATERIALS CHEMISTRY A   2 ( 32 )   12952 - 12961   2014.8

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c4ta02720e

  • N -confused phlorin A stable dihydroporphyrin isomer containing a confused pyrrole ring Reviewed

    Masatoshi Ishida, Kensuke Nakahara, Ryuichi Sakashita, Tomoya Ishizuka, Motonori Watanabe, Hidemitsu Uno, Atsuhiro Osuka, Hiroyuki Furuta

    Journal of Porphyrins and Phthalocyanines   18 ( 10-11 )   909 - 918   2014.5

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1142/S1088424614500692

  • Triarylene linked spacer effect for dye-sensitized solar cells

    Yuan Jay Chang, Yu-Jane Wu, Po-Ting Chou, Motonori Watanabe, Tahsin J. Chow

    THIN SOLID FILMS   558   330 - 336   2014.5

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tsf.2014.03.010

  • Four-layered [3.3] metacyclophane with ethenetetracarbonitrile

    Masahiko Shibahara, Motonori Watanabe, Kenta Goto, Teruo Shinmyozu

    ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS   70   O625 - +   2014.5

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S1600536814009362

  • Triarylene linked spacer effect for dye-sensitized solar cells Reviewed

    Yuan Jay Chang, Yu Jane Wu, Po Ting Chou, Motonori Watanabe, Tahsin J. Chow

    Thin Solid Films   558   330 - 336   2014.5

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tsf.2014.03.010

  • Synthesis, physical properties, and structure of TIPS-difuranoacenes Reviewed

    Motonori Watanabe, Ching Ting Chien, Yan Duo Lin, Yuan Jay Chang, Yuh Sheng Wen, Kenta Goto, Masahiko Shibahara, Teruo Shinmyozu, Tahsin J. Chow

    Tetrahedron Letters   55 ( 8 )   1424 - 1427   2014.2

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2014.01.036

  • Synthesis, physical properties, and structure of TIPS-difuranoacenes

    Motonori Watanabe, Ching-Ting Chien, Yan-Duo Lin, Yuan Jay Chang, Yuh-Sheng Wen, Kenta Goto, Masahiko Shibahara, Teruo Shinmyozu, Tahsin J. Chow

    TETRAHEDRON LETTERS   55 ( 8 )   1424 - 1427   2014.2

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2014.01.036

  • Anthracene based organic dipolar compounds for sensitized solar cells Reviewed

    Yan Zuo Lin, Chiung Hui Huang, Yuan Jay Chang, Chia Wei Yeh, Tsung Mei Chin, Kai Ming Chi, Po Ting Chou, Motonori Watanabe, Tahsin J. Chow

    Tetrahedron   70 ( 2 )   262 - 269   2014.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tet.2013.11.072

  • Anthracene based organic dipolar compounds for sensitized solar cells

    Yan-Zuo Lin, Chiung Hui Huang, Yuan Jay Chang, Chia-Wei Yeh, Tsung-Mei Chin, Kai-Ming Chi, Po-Ting Chou, Motonori Watanabe, Tahsin J. Chow

    TETRAHEDRON   70 ( 2 )   262 - 269   2014.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tet.2013.11.072

  • Photoswitching of conductance through salicylidene methylamine Reviewed

    Aleksandar Tsekov Staykov, Motonori Watanabe, Tatsumi Ishihara, Kazunari Yoshizawa

    Journal of Physical Chemistry C   118 ( 47 )   27539 - 27548   2014.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jp5081884

  • Four-layered [3.3]metacyclophane with ethenetetracarbonitrile Reviewed

    Masahiko Shibahara, Motonori Watanabe, Kenta Goto, Teruo Shinmyozu

    Acta Crystallographica Section E: Structure Reports Online   70 ( 5 )   2014.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S1600536814009362

  • Crystal structure of (E)-2-cyano-3-(12-methyl-12H-benzo[b]phenothiazin-11-yl)acrylic acid Reviewed

    Motonori Watanabe, Tatsumi Ishihara

    Acta Crystallographica Section E: Structure Reports Online   70 ( 9 )   o1026 - o1027   2014.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S1600536814018388

  • Crystal structure of a four-layered [3.3](3,5)pyridinophane Reviewed

    Masahiko Shibahara, Motonori Watanabe, Taisuke Matsumoto, Kenta Goto, Teruo Shinmyozu

    Acta Crystallographica Section E: Structure Reports Online   70 ( 11 )   447 - 450   2014.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1107/S1600536814023691

  • Benzo[1,2-b:4,5-b′]dithiophene and benzo[1,2-b:4,5-b′]difuran based organic dipolar compounds for sensitized solar cells Reviewed

    109   81 - 89   2014.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    Novel organic dyes that consist of either a benzo[1,2-b:4,5-b′] dithiophene or a benzo[1,2-b:4,5-b′]difuran core exhibited remarkable solar-to-energy conversion efficiency in dye-sensitized solar cells. The planar geometry of bridge moiety and its bulky substituents helped the dyes to form a high quality monolayer on the surface of titanium oxide. A typical device displayed photon-to-current conversion efficiency 60% in the region of 380-575 nm, a short-circuit photocurrent density 13.45 mA cm
    -2
    , an open-circuit photovoltage 0.72 V, and a fill factor 0.63, corresponding to an overall conversion efficiency 6.12%. In a test of using deoxycholic acid as a co-absorbent, an improvement of quantum efficiencies 8.37% was observed for certain compounds. However, for others the quantum efficiency decreased in 6.60-7.91%. The latter result indicated that the quality of some films cannot be further improved by the addition of deoxycholic acid. The photophysical properties were analyzed with the aid of TDDFT.

    DOI： 10.1016/j.dyepig.2014.04.043

  • Acenes Generated from Precursors and Their Semiconducting Properties

    Motonori Watanabe, Kew-Yu Chen, Yuan Jay Chang, Tahsin J. Chow

    ACCOUNTS OF CHEMICAL RESEARCH   46 ( 7 )   1606 - 1615   2013.7

    　More details

    Language：English  

    DOI： 10.1021/ar400002y

  • A soluble precursor of hexacene and its application in thin film transistors Reviewed

    Motonori Watanabe, Wei Ting Su, Kew Yu Chen, Ching Ting Chien, Ting Han Chao, Yuan Jay Chang, Shun Wei Liu, Tahsin J. Chow

    Chemical Communications   49 ( 22 )   2240 - 2242   2013.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c3cc00278k

  • The synthesis and ambipolar charge transport properties of 1,2,3,4-tetrafluoropentacene Reviewed

    Ching Ting Chien, Ta Chung Chiang, Motonori Watanabe, Ting Han Chao, Yuan Jay Chang, Yan Duo Lin, Hung Kai Lee, Ching Yang Liu, Chih Hsin Tu, Chia Hsing Sun, Tahsin J. Chow

    Tetrahedron Letters   54 ( 8 )   903 - 906   2013.2

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2012.11.126

  • The synthesis and ambipolar charge transport properties of 1,2,3,4-tetrafluoropentacene

    Ching-Ting Chien, Ta-Chung Chiang, Motonori Watanabe, Ting-Han Chao, Yuan Jay Chang, Yan-Duo Lin, Hung-Kai Lee, Ching-Yang Liu, Chih-Hsin Tu, Chia-Hsing Sun, Tahsin J. Chow

    TETRAHEDRON LETTERS   54 ( 8 )   903 - 906   2013.2

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2012.11.126

  • Solution-processed optoelectronic properties of functionalized anthradifuran Reviewed

    Motonori Watanabe, Wei Teing Su, Yuan Jay Chang, Ting Han Chao, Yuh Sheng Wen, Tahsin J. Chow

    Chemistry - An Asian Journal   8 ( 1 )   60 - 64   2013.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/asia.201200834

  • Solution-Processed Optoelectronic Properties of Functionalized Anthradifuran

    Motonori Watanabe, Wei-Teing Su, Yuan Jay Chang, Ting-Han Chao, Yuh-Sheng Wen, Tahsin J. Chow

    CHEMISTRY-AN ASIAN JOURNAL   8 ( 1 )   60 - 64   2013.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/asia.201200834

  • Organic dyes containing oligo-phenothiazine for dye-sensitized solar cells Reviewed

    Yuan Jay Chang, Po Ting Chou, Yan Zuo Lin, Motonori Watanabe, Chih Jen Yang, Tsung Mei Chin, Tahsin J. Chow

    Journal of Materials Chemistry   22 ( 40 )   21704 - 21712   2012.10

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c2jm35556f

  • Organic dyes containing oligo-phenothiazine for dye-sensitized solar cells

    Yuan Jay Chang, Po-Ting Chou, Yan-Zuo Lin, Motonori Watanabe, Chih-Jen Yang, Tsung-Mei Chin, Tahsin J. Chow

    JOURNAL OF MATERIALS CHEMISTRY   22 ( 40 )   21704 - 21712   2012.10

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c2jm35556f

  • Tetracene-based field-effect transistors using solution processes Reviewed

    Ching Ting Chien, Chih Chun Lin, Motonori Watanabe, Yan Duo Lin, Ting Han Chao, Ta Chung Chiang, Xin Hua Huang, Yuh Sheng Wen, Chih Hsin Tu, Chia Hsing Sun, Tahsin J. Chow

    Journal of Materials Chemistry   22 ( 26 )   13070 - 13075   2012.7

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c2jm31134h

  • The synthesis, crystal structure and charge-transport properties of hexacene

    Motonori Watanabe, Yuan Jay Chang, Shun-Wei Liu, Ting-Han Chao, Kenta Goto, Md. Minarul Islam, Chih-Hsien Yuan, Yu-Tai Tao, Teruo Shinmyozu, Tahsin J. Chow

    NATURE CHEMISTRY   4 ( 7 )   574 - 578   2012.7

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/NCHEM.1381

  • The synthesis, crystal structure and charge-transport properties of hexacene Reviewed

    Motonori Watanabe, Yuan Jay Chang, Shun Wei Liu, Ting Han Chao, Kenta Goto, Md Minarul Islam, Chih Hsien Yuan, Yu Tai Tao, Teruo Shinmyozu, Tahsin J. Chow

    Nature Chemistry   4 ( 7 )   574 - 578   2012.7

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/nchem.1381

  • Solution processed high performance pentacene thin-film transistors Reviewed

    Ting Han Chao, Ming Jen Chang, Motonori Watanabe, Ming Hui Luo, Yuan Jay Chang, Tzu Chien Fang, Kew Yu Chen, Tahsin J. Chow

    Chemical Communications   48 ( 49 )   6148 - 6150   2012.6

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c2cc31754k

  • 2-Halo-subsituted tetracenes Their generation and single crystal OFET characteristics Reviewed

    Motonori Watanabe, Ting Han Chao, Ching Ting Chien, Shun Wei Liu, Yuan Jay Chang, Kew Yu Chen, Tahsin J. Chow

    Tetrahedron Letters   53 ( 18 )   2284 - 2287   2012.5

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2012.02.060

  • 2-Halo-subsituted tetracenes: their generation and single crystal OFET characteristics

    Motonori Watanabe, Ting-Han Chao, Ching-Ting Chien, Shun-Wei Liu, Yuan Jay Chang, Kew-Yu Chen, Tahsin J. Chow

    TETRAHEDRON LETTERS   53 ( 18 )   2284 - 2287   2012.5

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2012.02.060

  • High-performance organic materials for dye-sensitized solar cells Triarylene-linked dyads with a 4-tert-butylphenylamine donor Reviewed

    Yuan Jay Chang, Po Ting Chou, Szu Yu Lin, Motonori Watanabe, Zhi Qian Liu, Ju Ling Lin, Kew Yu Chen, Shih Sheng Sun, Ching Yang Liu, Tahsin J. Chow

    Chemistry - An Asian Journal   7 ( 3 )   572 - 581   2012.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/asia.201100777

  • High-Performance Organic Materials for Dye-Sensitized Solar Cells: Triarylene-Linked Dyads with a 4-tert-Butylphenylamine Donor

    Yuan Jay Chang, Po-Ting Chou, Szu-Yu Lin, Motonori Watanabe, Zhi-Qian Liu, Ju-Ling Lin, Kew-Yu Chen, Shih-Sheng Sun, Ching-Yang Liu, Tahsin J. Chow

    CHEMISTRY-AN ASIAN JOURNAL   7 ( 3 )   572 - 581   2012.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/asia.201100777

  • Phenothiazine derivatives as organic sensitizers for highly efficient dye-sensitized solar cells Reviewed

    Chih Jen Yang, Yuan Jay Chang, Motonori Watanabe, Yung Son Hon, Tahsin J. Chow

    Journal of Materials Chemistry   22 ( 9 )   4040 - 4049   2012.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c2jm13961h

  • Paracyclophane as a bridging unit in the design of organic dyes for sensitized solar cells Reviewed

    Yuan Jay Chang, Motonori Watanabe, Po Ting Chou, Tahsin J. Chow

    Chemical Communications   48 ( 5 )   726 - 728   2012.1

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c1cc16248a

  • Synthesis and redox properties of π-conjugated 4,5-diazafluorene derivatives incorporating 9-cyanomethylene moiety as an electron acceptor Reviewed

    52 ( 44 )   5865 - 5868   2011.11

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    We have synthesized p-conjugated acceptor-type molecules 3a-d containing a cyanomethylene unit as the electron acceptor site and a 4,5-diazafluorene ligand for metal complexation. In the crystal, the planar 3a molecules stack along the b axis in the head-to-tail fashion. Compound 3a shows distinctive electrochromism and its three differently colored redox states (dianion (3 2-), anion radical (3.-), neutral (3)) exhibit remarkable stability.

    DOI： 10.1016/j.tetlet.2011.08.164

  • Synthesis and redox properties of pi-conjugated 4,5-diazafluorene derivatives incorporating 9-cyanomethylene moiety as an electron acceptor

    Katsuya Sako, Yasufumi Mugishima, Tetsuo Iwanaga, Shinji Toyota, Hiroyuki Takemura, Motonori Watanabe, Teruo Shinmyozu, Michito Shiotsuka, Hitoshi Tatemitsu

    TETRAHEDRON LETTERS   52 ( 44 )   5865 - 5868   2011.11

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2011.08.164

  • Structural properties of charge-transfer complexes of four- and five-layered [3.3]metacyclophanes Reviewed

    Masahiko Shibahara, Motonori Watanabe, Chang Yuan, Teruo Shinmyozu

    Tetrahedron Letters   52 ( 39 )   5012 - 5015   2011.9

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2011.07.060

  • Structural properties of charge-transfer complexes of four- and five-layered [3.3]metacyclophanes

    Masahiko Shibahara, Motonori Watanabe, Chang Yuan, Teruo Shinmyozu

    TETRAHEDRON LETTERS   52 ( 39 )   5012 - 5015   2011.9

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2011.07.060

  • Solution-processed organic micro crystal transistor based on tetraceno[2,3-b]thiophene from a monoketone precursor Reviewed

    Motonori Watanabe, Ting Han Chao, Shun Wei Liu, Ching Ting Chien, Yuan Jay Chang, Chih Hsien Yuan, Kuan Chun Huang, Shu Hua Chien, Teruo Shinmyozu, Tahsin J. Chow

    Journal of Materials Chemistry   21 ( 30 )   11317 - 11322   2011.8

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c1jm11834j

  • Structural properties of charge-transfer complexes of multilayered [3.3]paracyclophanes Reviewed

    Masahiko Shibahara, Motonori Watanabe, Chang Yuan, Kenta Goto, Teruo Shinmyozu

    Tetrahedron Letters   52 ( 26 )   3371 - 3375   2011.6

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2011.04.087

  • Structural properties of charge-transfer complexes of multilayered [3.3]paracyclophanes

    Masahiko Shibahara, Motonori Watanabe, Chang Yuan, Kenta Goto, Teruo Shinmyozu

    TETRAHEDRON LETTERS   52 ( 26 )   3371 - 3375   2011.6

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2011.04.087

  • Delocalization of positive charge in π-stacked multi-benzene rings in multilayered cyclophanes Reviewed

    115 ( 5 )   741 - 746   2011.2

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    In the present study, delocalization of a positive charge in π-stacked multi-benzene rings in multilayered para-and meta-cyclophanes, in which benzene rings are connected by propyl chains to form a chromophore array with the face-to-face structure, was investigated by means of transient absorption spectroscopy during the pulse radiolysis using dichloroethane as a solvent. The local excitation and charge resonance (CR) bands were successfully observed. It was revealed that the CR band shifted to the longer wavelength side with the number of the benzene rings. The stabilization energy estimated from the peak position of the CR band showed the efficient charge delocalization over the cyclophanes. Furthermore, the CR bands showed the slight spectral change attributable to the change in distribution of the conformers. The substantially long lifetime of the CR band can be explained on the basis of the smaller charge distribution on the outer layers of the multilayered cyclophanes.

    DOI： 10.1021/jp110916m

  • Delocalization of Positive Charge in pi-Stacked Multi-benzene Rings in Multilayered Cyclophanes

    Mamoru Fujitsuka, Sachiko Tojo, Masahiko Shibahara, Motonori Watanabe, Teruo Shinmyozu, Tetsuro Majima

    JOURNAL OF PHYSICAL CHEMISTRY A   115 ( 5 )   741 - 746   2011.2

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jp110916m

  • 2,1,3-benzothiadiazole dimers Preparation, structure, and transannular electronic interactions of syn-and anti-[2.2](4,7)benzothiadiazolophanes Reviewed

    Motonori Watanabe, Kenta Goto, Mamoru Fujitsuka, Sachiko Tojo, Tetsuro Majima, Teruo Shinmyozu

    Bulletin of the Chemical Society of Japan   83 ( 10 )   1155 - 1161   2010.10

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1246/bcsj.20100085

  • 2,1,3-Benzothiadiazole Dimers: Preparation, Structure, and Transannular Electronic Interactions of syn- and anti-[2.2](4,7)Benzothiadiazolophanes

    Motonori Watanabe, Kenta Goto, Mamoru Fujitsuka, Sachiko Tojo, Tetsuro Majima, Teruo Shinmyozu

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   83 ( 10 )   1155 - 1161   2010.10

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1246/bcsj.20100085

  • Synthesis, structure, and electronic and photophysical properties of two- and three-layered [3.3]Paracyclophane-based donor-acceptor systems (1) Reviewed

    Motonori Watanabe, Kenta Goto, Masahiko Shibahara, Teruo Shinmyozu

    Journal of Organic Chemistry   75 ( 18 )   6104 - 6114   2010.9

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jo100688m

  • Synthesis, Structure, and Electronic and Photophysical Properties of Two- and Three-Layered [3.3]Paracyclophane-Based Donor-Acceptor Systems

    Motonori Watanabe, Kenta Goto, Masahiko Shibahara, Teruo Shinmyozu

    JOURNAL OF ORGANIC CHEMISTRY   75 ( 18 )   6104 - 6114   2010.9

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jo100688m

  • A conformational study of [3.3](3,5)pyridinophane Reviewed

    Masahiko Shibahara, Motonori Watanabe, Masahiko Suenaga, Keiko Ideta, Taisuke Matsumoto, Teruo Shinmyozu

    Tetrahedron Letters   50 ( 12 )   1340 - 1344   2009.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2009.01.051

  • A conformational study of [3.3](3,5)pyridinophane

    Masahiko Shibahara, Motonori Watanabe, Masahiko Suenaga, Keiko Ideta, Taisuke Matsumoto, Teruo Shinmyozu

    TETRAHEDRON LETTERS   50 ( 12 )   1340 - 1344   2009.3

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.tetlet.2009.01.051

  • Synthesis of multilayered [3.3](3,5)pyridinophanes Reviewed

    Masahiko Shibahara, Motonori Watanabe, Kazuhiro Aso, Teruo Shinmyozu

    Synthesis   ( 23 )   3749 - 3754   2008.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1055/s-0028-1083633

  • Synthesis of Multilayered [3.3](3,5)Pyridinophanes

    Masahiko Shibahara, Motonori Watanabe, Kazuhiro Aso, Teruo Shinmyozu

    SYNTHESIS-STUTTGART   ( 23 )   3749 - 3754   2008.12

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1055/s-0028-1083633

  • Optical Resolution, Absolute Configuration, and Chiroptical Properties of Three-Layered [3.3]Paracyclophane

    Atsuya Muranaka, Masahiko Shibahara, Motonori Watanabe, Taisuke Matsumoto, Teruo Shinmyozu, Nagao Kobayashi

    JOURNAL OF ORGANIC CHEMISTRY   73 ( 22 )   9125 - 9128   2008.11

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jo801441h

  • Optical resolution, absolute configuration, and chiroptical properties of three-layered [3.3]paracyclophane Reviewed

    Atsuya Muranaka, Masahiko Shibahara, Motonori Watanabe, Taisuke Matsumoto, Teruo Shinmyozu, Nagao Kobayashi

    Journal of Organic Chemistry   73 ( 22 )   9125 - 9128   2008.11

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jo801441h

  • Synthesis, structure, and transannular pi-pi interaction of three- and four-layered [3.3]paracyclophanes (vol 73, pg 4441, 2008)

    Masahiko Shibahara, Motonori Watanabe, Tetsuo Twanaga, Taisuke Matsumoto, Keiko Ideta, Teruo Shinmyozu

    JOURNAL OF ORGANIC CHEMISTRY   73 ( 15 )   6052 - 6052   2008.8

    　More details

    Language：English  

    DOI： 10.1021/jo8013484

  • Synthesis, structure, and transannular π-π interaction of three-and four-layered [3.3]paracyclophanes (Journal of Organic Chemistry (2008) 73, (4441)) Reviewed

    73 ( 15 )   6052   2008.8

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jo8013484

  • Synthesis, structure, and transannular π-π interaction of three- and four-layered [3.3]paracyclophanes Reviewed

    73 ( 12 )   4433 - 4442   2008.6

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    (Figure Presented) The synthesis of three- and four-layered [3.3]paracyclophanes ([3.3]PCPs) 3-5 has been accomplished by utilizing the (p-ethylbenzenesulfonyl)methyl isocyanide (EbsMIC) method. The structures of the three- to four-layered [3.3]PCPs 3-5 and their diones 8, 10, and 11 have been elucidated based on the 1H NMR spectra and finally by X-ray structural analysis. In the three-layered [3.3]PCP-dione 8, the trimethylene bridges of the [3.3]PCP unit assume a chair conformation similar to that of 2, while the [3.3]PCP-2,11-dione unit assumes a boat conformation different from that of [3.3]PCP-dione 1 with a chair conformation. On the other hand, the two [3.3]PCP units in three-layered [3.3]PCP 3 both assume a boat conformation. In the four-layered [3.3]PCP-dione 10, the two outer [3.3]PCP units assume a boat conformation while the inner dione unit has a chair conformation. The trimethylene bridges in the four-layered [3.3]PCP 4 are highly disordered even at -150°C. All the outer benzene rings are distorted into a boat form while the inner ones are distorted into a twist form. In the electronic spectra, bathochromic shift and hyperchromic effect are observed, but the magnitude decreases with an increase in the number of layers and the spectra become structureless. In the charge-transfer (CT) bands of the three- to four-layered [3.3]PCPs 3-5 with tetracyanoethylene (TCNE), two absorption maxima (λmax) are observed. The effect of an increase in the layers becomes significant, and the changes in the longest wavelength λmax values from two to three and three to four are ca. 60 and 50 nm, respectively. By comparison of the stereoisomeric four-layered [3.3]PCPs 4 (meso) and 5 (racemic), the helical arrangement of the trimethylene bridges of 5 shows a more efficient transannular π-electronic interaction. In the three- to four-layered [3.3]PCP-diones, a magnitude of the CT interaction almost comparable to that of [3.3]PCP 2 was observed, and this indicates that the -CH2COCH2- bridges inhibit the CT interaction and that this tendency is supported by the calculated HOMO energy levels and observed oxidation potentials. Three- and four-layered [3.3]PCPs 3-5 show reversible redox processes, and 4 and 5 show an electron-donating ability almost comparable to that of [36]CP. Very good correlation between the λλmax of the CT bands with TCNE and the oxidation potentials is observed.

    DOI： 10.1021/jo8003309

  • Synthesis, structure, and transannular pi-pi interaction of three- and four-layered [3.3]paracyclophanes

    Masahiko Shibahara, Motonori Watanabe, Tetsuo Iwanaga, Taisuke Matsumoto, Keiko Ideta, Teruo Shinmyozu

    JOURNAL OF ORGANIC CHEMISTRY   73 ( 12 )   4433 - 4442   2008.6

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jo8003309

  • Synthesis, structure, and transannular π-π interaction of multilayered [3.3]metacyclophanes Reviewed

    72 ( 8 )   2865 - 2877   2007.4

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    (Figure Presented) The synthesis of a series of three- to six-layered [3.3]metacyclophanes ([3.3]MCPs) 3-6 has been successfully accomplished by the (p-tolylsulfonyl)methyl isocyanide (TosMIC) method as a critical coupling reaction. Their important synthetic intermediates are the two- and three-layered bis(bromomethyl) compounds 11, 17, 21, and tetrakis(bromomethyl) compounds 25 and 28. The structures of the three- to six-layered [3.3]MCPs (3-6) as well as three- to six-layered [3.3]MCP-di- (22-24) and tetraones (26, 27, and 29) as the synthetic intermediates have been elucidated based on the 1H NMR data and X-ray structural analysis. These multilayered cyclophanes are constructed with two different geometries, syn[3.3]MCP and anti-[3.3]MCP-2,11- dione. In principle, their geometries are maintained in the multilayered [3.3]MCPs, but deformation of the dihedral angle of the two benzene rings of the syn-[3.3]MCP moiety is generally observed. In the four-layered MCP 4, the central [3.3]MCP moiety takes an anti geometry. These data indicate the structural flexibility of the [3.3]MCP moiety. In the electronic spectra, rather simple and structureless absorption curves are observed, and the most significant spectral change is observed for the two to three layers and becomes less effective even if it is more layered. In the charge-transfer (CT) bands of the multilayered [3.3]MCPs with tetracyanoethylene (TCNE), the λmaxmax gradually shifts to the longer wavelength region, but the extent of the shift is much smaller as the number of layers increases. In the multilayered [3.3]MCP-di- and tetraones, the anti-[3.3]MCP-dione moiety works as an insulator. Therefore, the CT interaction of the four- and five-layered [3.3]MCPs with one anti-[3.3]MCP-dione moiety (23 and 24) shows the almost comparable magnitude of the interaction with the two- and three-layered [3.3]MCPs (2 and 3), respectively. The tetraones of the three and four-layered MCPs (29 and 26) do not show CT interactions except for the six-layered MCP 27.

    DOI： 10.1021/jo062220m

  • Multilayered [3.3]cyclophanes, Part 1. Synthesis, structure, and transannular pi-pi interaction of multilayered [3.3]Metacyclophanes(1)

    Masahiko Shibahara, Motonori Watanabe, Tetsuo Iwanaga, Keiko Ideta, Teruo Shinmyozu

    JOURNAL OF ORGANIC CHEMISTRY   72 ( 8 )   2865 - 2877   2007.4

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jo062220m

  • Enhancement of solid base activity for porous boron nitride catalysts by controlling active structure using post treatment Invited Reviewed International journal

    Atsushi Takagaki, Shohei Nakamura, Motonori Watanabe, Yoonyoung Kim, Jun Tae Song, Keiko Jimura, Kanta Yamada, Masaaki Yoshida, Shigenobu Hayashi, Tatsumi Ishihara

    1900

    　More details

    Language：English   Publishing type：Research paper (scientific journal)  

▼display all

Books

  • Hydrogen Energy Engineering, Part of the series Green Energy and Technology Eds. Kazunari Sasaki et al

    Aleksandar Staykov, Stephen M. Lyth, Motonori Watanabe（ Role： Joint author）

    Springer book  2016.9 

    　More details

    Responsible for pages：pp 159-174 (Photocatalytic Water Splitting)   Language：English   Book type：Scholarly book

  • Synthesis, structure, and electronic and photophysical properties of donor–acceptor cyclophanes

    2014.1 

    　More details

    Responsible for pages：95-136   Language：English  

  • Solution-processed acenes and their applications on field-effect transistor

    Motonori Watanabe, Tahsin J. Chow

    Pan Stanford Publishing Pte. Ltd.  2014.1 

    　More details

    Responsible for pages：455-486   Language：English  

Presentations

  • Study of stable visible-near infrared sensitized photocatalyst using BODIPY dye International conference

    Motonori Watanabe

    The 13th Taiwan-Japan Bilateral Symposium on Architecture of Functional Organic Molecules  2023.10 

    　More details

    Event date： 2023.10

    Language：English   Presentation type：Oral presentation (general)  

    Country：Taiwan, Province of China  

  • Design of organic-inorganic composite photocatalyst for visible light driven water splitting hydrogen production Invited International conference

    Motonori Watanabe

    Ming Chi University of Technology seminar  2023.10 

    　More details

    Event date： 2023.10

    Language：English   Presentation type：Oral presentation (general)  

    Country：Taiwan, Province of China  

  • Design of effective charge separation in dye-sensitized photocatalyst Invited International conference

    Motonori Watanabe

    The Sino-Japan Symposium on Environmental Catalysis (SSEC) 2023  2023.8 

    　More details

    Event date： 2023.8

    Language：English   Presentation type：Oral presentation (invited, special)  

    Country：Japan  

  • Pyridyl-anchored BODIPY Sensitizer-TiO2 Photocatalyst for Enhanced Near-infrared Light-Driven Photocatalytic Hydrogen Production

    Xiao-Feng Shen, Motonori Watanabe*, Atsushi Takagaki, Jun Tae Song, Tatsumi Ishihara.

    The 32nd Symposium on Physical Organic Chemistry  2022.9 

    　More details

    Event date： 2023.6

    Language：Japanese  

    Country：Japan  

  • BODIPY Sensitizer-TiO2 Photocatalyst for Enhanced Visible to Near-infrared Light-Driven Photocatalytic Hydrogen Productio International conference

    Xiao-Feng Shen, Motonori Watanabe*, Atsushi Takagaki, Jun Tae Song, Tatsumi Ishihara.

    18th Japan-Korea Symposium on Catalysis (18JKSC)  2021.11 

    　More details

    Event date： 2023.6

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • Design of stable dye-sensitized photocatalyst for photocatalytic hydrogen production in water medium Invited International conference

    Motonori Watanabe

    2021 International Symposium on Catalysis for Renewable Energy and Air Pollution Control: Virtual Symposium  2021.11 

    　More details

    Event date： 2023.6

    Language：English  

    Country：Japan  

  • BODIPY-containing D- π-A type sensitized TiO2 photocatalyst for H2 production under NIR light Invited International conference

    2022.7 

    　More details

    Event date： 2023.6

    Language：English   Presentation type：Oral presentation (general)  

    Venue：July 11, 2022, Hiroshima   Country：Japan  

  • D- π-A type sensitized TiO2 photocatalyst for H2 production Invited International conference

    2022.7 

    　More details

    Event date： 2023.6

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：July 22-23,2022, Minamiaso, Kumamoto.   Country：Japan  

  • D- π-A type sensitized TiO2 photocatalyst for H2 production Invited International conference

    2022.7 

    　More details

    Event date： 2022.7

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Minamiaso, Kumamoto.   Country：Japan  

  • Stable dye-sensitized photocatalytic hydrogen production in water medium Invited International conference

    Motonori Watanabe

    The 18th Asian Chemical Congress (18th ACC)  2019.12 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

    Country：Taiwan, Province of China  

  • Synthesis of the Ethynyl-substituent functionalized difuranoanthracene and physical property

    Motonori Watanabe, Yasutaka Doi, Hidehisa Hagiwara, Aleksandar Staykov, Taisuke Matsumoto, Teruo Shinmyozu, Shintaro Ida, Tatsumi Ishihara

    26th Symposium on Physical Organic Chemistry  2015.9 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • Impact of Alkoxy Chain Length on Carbazole-based, Visible Light-driven, Dye Sensitized Photocatalytic Hydrogen Production

    Motonori Watanabe, Hidehisa Hagiwara, Yudai Ogata, Aleksandar Staykov, Sean R. Bishop, Nicola H. Perry, Yuan Jay Chang, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

    2015.10 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • Furan-contained oligoacene and opt-electronic application Invited International conference

    Motonori Watanabe, Yuan Jay Chang, Kenta Goto, Masahiko Shibahara, Teruo Shinmyozu, Tatsumi Ishihara, and Tahsin J Chow

    International Symposium on Construction and Application of Functional Molecules /System  2015.10 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Organic-Semiconductor hybrid photocatalyst for photocatalytic hydrogen production

    Motonori Watanabe

    2016.5 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Organic Dye Sensitized Visible Light Driven Photocatalytic Hydrogen Production from Water International conference

    Motonori Watanabe

    2nd International Symposium on Chemical Energy Conversion Processes (ISCECP-2)  2016.5 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Organic Dye-Inorganic Semiconductor Hybrid Catalyst: Visible Light Driven Photocatalytic Hydrogen Production International conference

    Motonori Watanabe

    Joint UNSW-I2CNER Workshop  2016.6 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Small Band-Gap Organic Materials for Opt-Electronic Application and Energy Conversion Invited International conference

    Motonori Watanabe

    2016.6 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Synthesis, Structure, and Physical Properties of Tetracene ligand and its [FeFe] hydrogenase mimic metal complex for photocatalyst

    Motonori Watanabe

    27th Symposium on Physical Organic Chemistry  2016.9 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • Novel Acene as Semiconducting Materials for Opt-Electronic and Energy Devices Invited

    Motonori Watanabe

    Invited Seminar, Nagoya Technology University  2016.11 

    　More details

    Language：Japanese   Presentation type：Oral presentation (general)  

  • Organic-inorganic composite photocatalysts for hydrogen production Invited International conference

    Motonori Watanabe

    2017 INTERNATIONAL SYMPOSIUM FOR ADVANCED MATERIALS RESEARCH (ISAMR 2017)  2017.8 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Synthesis and physical property of brominated hexacene

    Motonori Watanabe

    Structural Organic Chemistry for Young Researchers symposium 2017  2017.8 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • Development of synthesis method of acenes and application to functional organic materials / devices Invited

    Motonori Watanabe

    Organic Synthesis Association Kyushu Yamaguchi Branch, 29th Seminar for Young Researcher  2017.8 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • Modification of organic molecule structure for opt-electronic devices in photocatalytic hydrogen production in water medium Invited International conference

    Motonori Watanabe

    The 10th Taiwan-Japan Bilateral Symposium on Architecture of Functional Organic Molecules  2017.10 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Physical properties of hexacenes and thin-film state hole-transfer properties Invited International conference

    Motonori Watanabe

    The 11th Taiwan-Japan Bilateral Symposium on Architecture of Functional Organic Molecules  2018.5 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Modification of organic molecule structure for opt-electronic devices in photocatalytic hydrogen production in water medium International conference

    Motonori Watanabe

    European Materials Research Society Spring Meeting 2018, The Convention Centre of Strasbourg  2018.6 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Design of organic-inorganic composite photocatalyst for visible light driven water splitting hydrogen production Invited International conference

    Motonori Watanabe

    European Materials Research Society Spring Meeting 2018, The Convention Centre of Strasbourg (France)  2018.6 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Synthesis and physical properties of brominated hexacene and hole-transfer properties of thin-film transistors

    Motonori Watanabe, Takaaki Miyazaki, Toshinori Matsushima, Junko Matsuda, Ching Ting Chein, Masahiko Shibahara, Chihaya Adachi, Shih Sheng Sun, Tahsin J. Chow, Tatsumi Ishihara

    29th Symposium on Physical Organic Chemistry  2018.9 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • Synthesis of Higher Acene from Soluble Precursors

    Motonori Watanabe

    Fuzzy bond Conference  2018.9 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

    Country：Japan  

  • Photocatalytic water decomposition using soluble acene-inorganic composite catalyst

    Motonori Watanabe, Hidehisa Hagiwara, Tatsumi Ishihara

    Structural Organic Chemistry Mini Symposium. The University of Shiga Prefecture  2018.9 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • Pyridyl anchored stable dye-sensitized hydrogen production in water medium International conference

    Motonori Watanabe

    2019 Spring Meeting  2019.5 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

    Country：France  

  • Anchor group effect for stable dye-sensitized hydrogen production in water medium Invited International conference

    Motonori Watanabe

    The 12th Taiwan-Japan Bilateral Symposium on Architecture of Functional Organic Molecules  2019.8 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

    Country：Taiwan, Province of China  

  • Organic dye modified visible light driven photocatalytic water decomposition for hydrogen production Invited International conference

    Motonori Watanabe

    2015 Fall Symposium of Photochemistry Association in Taiwan  2015.9 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Synthesis and property of hexacene from precursor.

    Motonori Watanabe, Kenta Goto, Teruo Shinmyozu, Tahsin J Chow

    93th Annual Meeting of The Chemical Society of Japan,  2013.5 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • A Novel Phenothiazine Derivative Organic Dye for Photocatalytic Water Splitting Reaction International conference

    Motonori Watanabe, Hidehisa Hagiwata, Tatsumi Ishihara

    15th International Symposium on Novel Aromatic Compounds  2013.7 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • A Novel Organic Dye for Photocatalytic Water Splitting Reaction

    Motonori Watanabe, Hidehisa Hagiwata, Tatsumi Ishihara

    24th Symposium on Physical Organic Chemistry  2013.9 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • Synthesis and opt-electronic properties of TIPS-substituent higher difranoacenes

    Motonori Watanabe, Yuan Jay Chang, Masahiko Shibahara, Kenta Goto, Teruo Shinmyozu, Tahsin J Chow

    2013.12 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • Novel Phenothiazine-Derived Organic Dyes for Visible-Light-Driven Dye-Sensitized Photocatalytic Hydrogen Production International conference

    Motonori Watanabe, Hidehisa Hagiwara, Aoi Iribe, Kenta Shiomi, Shintaro Ida, Tatsumi Ishihara

    International Conference on Hydrogen Production-2014  2014.2 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Synthesis of Novel higher difranoacenes

    Motonori Watanabe, Masahiko Shibahara, Kenta Goto, Teruo Shinmyozu, Tahsin J Chow

    94th Annual Meeting of The Chemical Society of Japan  2014.5 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • Spacer Effects in Metal-Free Organic Dyes for Visible-Light Driven Dye-Sensitized Photocatalytic Hydrogen Production International conference

    Motonori Watanabe, Hidehisa Hagiwara, Aoi Iribe, Yudai Ogata, Kenta Shiomi, Aleksandar Staykov, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

    Pre-symposium TOCAT7 in Fukuoka  2014.5 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Benzophenothiazine containing Donor-Acceptor Dyads for Photocatalytic Water Splitting Hydrogen Production Reaction

    Motonori Watanabe, Hidehisa Hagiwara, Aoi Iribe, Yudai Ogata, Kenta Shiomi, Aleksandar Staykov, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

    51th Kitakytushu Symposium on Related with Chemistry-Associated Branch  2014.6 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • Novel Donor-Acceptor Organic Molecules for Visible Light Driven Photocatalytic Dye-Sensitized Water Splitting Hydrogen Production Invited International conference

    Motonori Watanabe

    International Conference for Top and Emerging Materials Scientists  2014.7 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • An Impact of Alkyl Chain Effect in Metal-Free Organic Dyes for Visible-Light-Driven Dye-Sensitized Photocatalytic Hydrogen Production

    Motonori Watanabe, Hidehisa Hagiwara Yudai Ogata, Aleksandar Staykov, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

    25th Symposium on Physical Organic Chemistry,  2014.9 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • Synthesis, Structure, and Physical Property of Novel Difuranoacene

    Motonori Watanabe, Yasutaka Doi, Hidehisa Hagiwara, Shintaro Ida, Tatsumi Ishihara

    2014.11 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • An impact of alkyl chain length for water splitting performance in carbazole-based visible light driven dye-sensitized water splitting hydrogen production International conference

    Motonori WATANABE, Hidehisa HAGIWARA, Yudai OGATA, Shen BISHOP, Shintaro IDA, Tanaka KEIJI, Tatsumi ISHIHARA

    International Conference on Artificial Photosynthesis (ICARP2014),  2014.11 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Novel Metal-Free Donor-Spacer-Acceptor Dyads for Visible Light Driven Dye-Sensitized Water Splitting Hydrogen Production Invited International conference

    Motonori Watanabe

    The 8th Taiwan-Japan Bilateral Symposium on Architecture of Functional Organic Molecules,  2014.11 

    　More details

    Language：English   Presentation type：Symposium, workshop panel (public)  

  • Synthesis, Structure, and Physical Property of Novel Difuranoacene

    Motonori Watanabe, Yasutaka Doi, Hidehisa Hagiwara ,Shintaro Ida, Tatsumi Ishihara

    52th Kitakytushu Symposium on Related with Chemistry-Associated Branch  2015.1 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

  • Visible light driven photocatalytic water decomposition for hydrogen production

    Motonori Watanabe

    Mini-Symposium for Young Researchers in Structure for Organic Chemistry  2015.8 

    　More details

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

▼display all

MISC

Professional Memberships

  • 有機合成化学協会

  • 日本化学会

Academic Activities

  • 実行委員 International contribution

    2023.10

    　More details

    Type：Competition, symposium, etc. 

  • 実行委員

    2023電気化学秋季大会  （ 九州大学 伊都キャンパス ） 2023.9

    　More details

    Type：Competition, symposium, etc. 

  • Screening of academic papers

    Role(s)： Peer review

    2023

    　More details

    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：66

    Number of peer-reviewed articles in Japanese journals：0

    Proceedings of International Conference Number of peer-reviewed papers：0

    Proceedings of domestic conference Number of peer-reviewed papers：0

  • Screening of academic papers

    Role(s)： Peer review

    2021

    　More details

    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：78

    Number of peer-reviewed articles in Japanese journals：0

    Proceedings of International Conference Number of peer-reviewed papers：0

    Proceedings of domestic conference Number of peer-reviewed papers：0

  • Screening of academic papers

    Role(s)： Peer review

    2020

    　More details

    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：40

    Number of peer-reviewed articles in Japanese journals：0

    Proceedings of International Conference Number of peer-reviewed papers：0

    Proceedings of domestic conference Number of peer-reviewed papers：0

  • Screening of academic papers

    Role(s)： Peer review

    2019

    　More details

    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：27

    Number of peer-reviewed articles in Japanese journals：0

    Proceedings of International Conference Number of peer-reviewed papers：0

    Proceedings of domestic conference Number of peer-reviewed papers：0

  • Applied Phhysics A International contribution

    2018.7 - 2029.12

    　More details

    Type：Academic society, research group, etc. 

  • Screening of academic papers

    Role(s)： Peer review

    2018

    　More details

    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：20

    Number of peer-reviewed articles in Japanese journals：0

    Proceedings of International Conference Number of peer-reviewed papers：0

    Proceedings of domestic conference Number of peer-reviewed papers：0

  • 実行委員長 International contribution

    （ 宮﨑研シーガイアコンベンションセンター ） 2017.10

    　More details

    Type：Competition, symposium, etc. 

  • 実行委員

    第２８回基礎有機化学討論会  （ 九州大学伊都キャンパス ） 2017.9

    　More details

    Type：Competition, symposium, etc. 

  • Screening of academic papers

    Role(s)： Peer review

    2017

    　More details

    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：21

    Number of peer-reviewed articles in Japanese journals：0

    Proceedings of International Conference Number of peer-reviewed papers：0

    Proceedings of domestic conference Number of peer-reviewed papers：0

  • Screening of academic papers

    Role(s)： Peer review

    2016

    　More details

    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：10

    Number of peer-reviewed articles in Japanese journals：0

    Proceedings of International Conference Number of peer-reviewed papers：0

    Proceedings of domestic conference Number of peer-reviewed papers：0

  • Screening of academic papers

    Role(s)： Peer review

    2015

    　More details

    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：9

    Number of peer-reviewed articles in Japanese journals：0

    Proceedings of International Conference Number of peer-reviewed papers：0

    Proceedings of domestic conference Number of peer-reviewed papers：0

  • 実行委員 International contribution

    （ 九州大学箱崎キャンパス ） 2014.11

    　More details

    Type：Competition, symposium, etc. 

  • Screening of academic papers

    Role(s)： Peer review

    2014

    　More details

    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：12

    Number of peer-reviewed articles in Japanese journals：0

    Proceedings of International Conference Number of peer-reviewed papers：0

    Proceedings of domestic conference Number of peer-reviewed papers：0

  • Screening of academic papers

    Role(s)： Peer review

    2013

    　More details

    Type：Peer review 

    Number of peer-reviewed articles in foreign language journals：2

    Number of peer-reviewed articles in Japanese journals：0

    Proceedings of International Conference Number of peer-reviewed papers：0

    Proceedings of domestic conference Number of peer-reviewed papers：0

▼display all

Research Projects

  • 三重項状態利用を増進する広帯領域増感色素の開拓と光電気水分解デバイスへの応用

    Grant number：24H00486  2025 - 2028

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    　 More details

    Authorship：Principal investigator  Grant type：Scientific research funding

  • 先端国際共同研究推進事業 次世代のためのASPIRE「光電解デバイス電極における高速電荷輸送のための有機-無機複合界面に関する国際頭脳循環」 International coauthorship

    2024.2 - 2027.3

    九州大学 

    　 More details

    Authorship：Principal investigator 

    水素は有用なエネルギーキャリアとして着目されているが、カーボンニュートラルの観点から、二酸化炭素を非発生、または有用分子へ変換可能な技術に伴った水素生産方法が必要である。太陽光エネルギーを用いて光触媒によって水素を製造する手法は二酸化炭素を排出しない最も理想的な方法であるが、実用化に向けて高い太陽光エネルギー変換効率を示す研究が世界的に加速している。本研究は、可視光・近赤外応答型有機色素・ハライドペロブスカイトや高活性無機材料で形成される界面での電荷分離の高速化による太陽光エネルギー変換効率の向上を目的とし、薄膜成膜技術や助触媒表面処理の実績を有するスイス国チームと国際共同研究を行い、有機・無機界面高速電荷輸送のための薄膜作製並びに放射光による膜構造解析を行う。両国チームによる頭脳循環の促進のための若手研究者の交流研究を通して有機・無機界面科学のネットワーク形成を進める。

  • 光電解デバイス電極における高速電荷輸送のための有機-無機複合界面に関する国際頭脳循環

    2024 - 2028

    科学研究費補助金 (文部科学省）

    　 More details

    Authorship：Principal investigator  Grant type：Contract research

  • 基盤研究C「剥離能を有する色素材料を用いた分散型色素増感複合ナノシートの開発と光触媒応用」

    2021.5

    　 More details

    Authorship：Principal investigator 

  • 剥離能を有する色素材料を用いた分散型色素増感複合ナノシートの開発と光触媒応用

    Grant number：21K04692  2021 - 2023

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    　 More details

    Authorship：Principal investigator  Grant type：Scientific research funding

  • International Cooperation Add-on Project, Ministry of Science and Technology (MOST), Taiwan, ‘’Synthesis of higher acenes and their derivatives’’. Jan.1-July.31, 2019 International coauthorship

    2019.6

    　 More details

    Authorship：Principal investigator 

    本研究では高次アセン類の新規合成法の開発と、その手法を応用した新規アセン類の合成、物性評価、そしてデバイス展開を目的とする。

  • 液体‐半固体‐固体試料を測定可能にする共通機器・核磁気共鳴装置の構築

    2019

    2019年度～2019年度, 若手研究者研究環境整備経費（九州大学ルネッサンスプロジェクト）

    　 More details

    Authorship：Principal investigator  Grant type：On-campus funds, funds, etc.

  • 2018年度 日揮・実吉奨学会研究助成金「可視光‐近赤外応答色素ハイブリッド増感型光触媒による革新的水分解系の開発と水素製造」

    2018.9 - 2019.8

    九州大学カーボンニュートラルエネルギー国際研究所 

    　 More details

    Authorship：Principal investigator 

    これまでに報告されている幅広い光を吸収できる光触媒の系は、無機材料あるいは、ポルフィリンと呼ばれる、光合成色素を模倣したものに限られた。しかしながら、これらの系は幅広い吸収帯を有するものの、吸収強度は近赤外部分では非常に弱く、その性能は限られていた。本申請では申請者がこれまでに開発してきた色素群に、さらに太陽光のうち５０％光エネルギー源として利用可能な近赤外部分をカバー可能な色素を組み合わせ、より広範囲に太陽光をカバーし、従来に比べて５０％高効率化可能な革新的光→エネルギー変換による水からの水素製造を目指す。

  • 脱カルボニル芳香族環反応を利用した一段階シクラセン合成

    Grant number：17K19123  2018 - 2019

    日本学術振興会  科学研究費助成事業  挑戦的研究（萌芽）

    　 More details

    Authorship：Principal investigator  Grant type：Scientific research funding

  • 可視光‐近赤外応答色素ハイブリッド増感型光触媒による革新的水分解系の開発と水素製造

    2018 - 2019

    日揮・実吉奨学会研究助成金

    　 More details

    Authorship：Principal investigator  Grant type：Contract research

  • 若手研究(A) 「有機鉄錯体を助触媒とした貴金属フリー光触媒系の開発」

    2017.4 - 2020.3

    九州大学カーボンニュートラルエネルギー国際研究所 

    　 More details

    Authorship：Principal investigator 

    本研究では水素を生産する酵素ヒドロゲナーゼの鉄錯体構造に注目し、これを模倣した白金に替わる新規有機鉄系助触媒の開発を行い、光触媒に適切に組み込んだ「非貴金属系ハイブリッド光触媒」による水分解水素製造と、白金に変わる新たな鉄系助触媒の有用性を実証する。過去の鉄錯体のスクリーニング並びに有機鉄錯体助触媒を開発し、その物性を明らかにするとともに、無機酸化物と鉄錯体助触媒を組み合わせ、光触媒のモデルを作るこ とを目的とし、研究を行う。

  • 挑戦的研究（萌芽） 「脱カルボニル芳香族環反応を利用した一段階シクラセン合成」

    2017.4 - 2019.3

    九州大学カーボンニュートラルエネルギー国際研究所 

    　 More details

    Authorship：Principal investigator 

    本研究は、シクラセン骨格を形成可能な前駆体を合成し、化学反応に代わる熱・光に よる温和な条件を刺激とした反応により目的となるシクラセンを達成しようとするものである。目的となるシク ラセン骨格の出発原料としてノルボルナジエン骨格を選択したところ、シクラセン骨格の平面伸長構造であるブ ロモヘキサセン前駆体の合成に初めて成功した。しかしながら、本手法では小さな環サイズを有する前駆体を合 成することは難しかったので、ノルボルナジエン-2,3,5,6-テトラジエン体による反応を試みたが、対応するシ クラセン前駆体は合成できなかった。今後は多段階反応によるシクラセン骨格の合成を検討することが課題とな った。

  • 有機鉄錯体を助触媒とした貴金属フリー光触媒系の開発

    Grant number：17H04888  2017 - 2019

    科学研究費助成事業  若手研究(A)

    　 More details

    Authorship：Principal investigator  Grant type：Scientific research funding

  • 基盤研究C「グラフェンナノリボンの原子配列構造を活用した電子デバイス」

    2016.4 - 2017.3

    東北大学, 原子分子材料科学高等研究機構 

    　 More details

    Authorship：Coinvestigator(s) 

    The aim of this proposal is to advance graphene nanoribbon (GNR) fabrication by self-assembly for the purpose of transport-devices fabrication that can elucidate the unique effects of the exact graphene atomic structures on its electromagnetic properties. We have obtained both theoretical and experimental results that are pertinent towards the goal of fabricating the first precise zigzag-edge GNR device, with properties directly accessible from the macroscopic scale. Both these results address the effects of chemical functional groups of the precursor molecules on the length of the final GNR product after self-assembly. We have developed a new mathematical equivalence sampling method to model the assembly of precursor molecules with arbitrary functional groups, to predict the final morphology of the GNR products. We have also used experiments to test the effects of select functional groups on the precursor molecules to determine the actual effects of these functional groups on the morphology of the final GNR products. From these two sets of results, we have elucidated the mechanism of GNR fabrication by self-assembly using select precursor molecules. These results directly contribute to the ultimate goal of this project.

  • グラフェンナノリボンの原子配列構造を活用した電子デバイス

    Grant number：16K04897  2016 - 2017

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    　 More details

    Authorship：Coinvestigator(s)  Grant type：Scientific research funding

  • 光応答型有機錯体ー無機ハイブリッド光触媒のための新規有機助触媒の開発

    2015 - 2016

    平成２８年度　ＱＲプログラム（わかばチャレンジ）

    　 More details

    Authorship：Principal investigator  Grant type：On-campus funds, funds, etc.

  • 若手研究(B) 「アルコールに可溶な前躯体を利用した有機半導体材料の開発とセンサーへの展開研究 」

    2014.4 - 2016.3

    九州大学カーボンニュートラルエネルギー国際研究所 

    　 More details

    Authorship：Principal investigator 

    本研究ではアルコールに可溶な新規有機半導体の前駆体の開発と、これを用いた半導体材料への化学的刺激による変換、並びにこの変換を利用した電荷輸送能の評価と光・化学刺激応答センサーへの展開を行うことを目的とし、アルコール溶解部位の開発と化学刺激により構造変換可能な有機半導体材料の開発を行った。一連の研究により、アルコールに可溶な新規材料としてアルキル鎖修飾ロイコインジゴを見出し、酸素刺激により半導体材料アルキルインジゴへと変換した。この結果を基に得られた新規アルキルインジゴデバイスは酸素－光応答による新規化学センサーへの展開が可能であった。

  • 倉田奨励金「高安定なラジカル性有機半導体材料の開発と有機トランジスタへの応用」

    2014.4 - 2015.3

    九州大学カーボンニュートラルエネルギー国際研究所 

    　 More details

    Authorship：Principal investigator 

    アセン骨格を１次元に拡張した「高次アセン」類はラジカル性を有し、高い電荷輸送材料と期待されるが、合成の煩雑さ、取り扱いづらさから、研究をデバイスへ応用させた研究は少ない。我々はこれまでに簡便な高次アセンの合成法の開発を行っており、これまで不可能とされてきた高次アセンの合成と４cm2/Vs以上の電荷移動度を有するデバイス作成を達成してきている。近年、化学的に発生させたアセン類のラジカル種は、中性種に比べ安定性が高まるという報告がある。そこで本研究では単離可能でラジカル性を有すると期待される、「ラジカル性高次アセン」の開発と物性研究を行う。これら化合物の物性を明らかにするとともに、これまでの有機材料のトランジスタ性能を凌駕する材料開発を目指す。

  • アルコールに可溶な前躯体を利用した有機半導体材料の開発とセンサーへの展開研究

    Grant number：26810107  2014 - 2015

    科学研究費助成事業  若手研究(B)

    　 More details

    Authorship：Principal investigator  Grant type：Scientific research funding

  • 高安定なラジカル性有機半導体材料の開発と有機トランジスタへの応用

    2014 - 2015

    倉田奨励金

    　 More details

    Authorship：Principal investigator  Grant type：Contract research

  • 研究活動スタート支援 「新規なアンバイポーラ有機半導体材料の開発に関する研究 」

    2013.4 - 2014.3

    九州大学カーボンニュートラルエネルギー国際研究所 

    　 More details

    Authorship：Principal investigator 

    本研究ではアンバイポーラ能を有する新規機能性有機色素材料の探索を目的とし、材料の分子設計、開発、並びにその物性研究を目的として行った。研究では、研究者がこれまでに研究を続けてきた、高い正孔輸送能を有する「アセン」骨格に、電子輸送能を有する骨格を組み込むことで新規なアンバイポーラ材料を開発する計画であり、この際、研究の促進を期待して分子計算によるアプローチを行った。理論計算では、材料のエネルギー準位、スペクトルの吸収位置、そして、電荷輸送の際に最も重要なファクターである、分子構造の「再配列エネルギー」を調べることができる。この計算アプローチは本研究を行う九州大学のスーパーコンピュータシステムを利用した。アプローチの結果、数種の骨格導入が、アンバイポーラ能の発現に有用であることが期待された。
    例えばアセン骨格の両末端にフラン環を導入した「ジフラノアセン」誘導体では、環縮合数の増加に伴い、正孔・電子輸送の際の再配列エネルギーが減少し、アンバイポーラ能を発現する事が期待された。この結果を元に、実際に材料を合成し、環縮合数が６つであるジフラノテトラセンおよび７つであるジフラノペンタセンの誘導体を新規に合成した。これら化合物群は、結晶・溶液中で、暗室下において非常に安定であり、材料として有用であることが期待された。さらに、環縮小に伴い吸収スペクトルは長波長側へシフトし、エネルギーギャップが狭まることが示唆された。これは実際にサイクリックボルタンメトリーにより確認でき、アンバイポーラ能を持つ可能性が高いことが実験的にも期待された。

  • 新規なアンバイポーラ有機半導体材料の開発に関する研究

    Grant number：25888018  2013 - 2014

    日本学術振興会  科学研究費助成事業  研究活動スタート支援

    　 More details

    Authorship：Principal investigator  Grant type：Scientific research funding

▼display all

Educational Activities

  • Department of Automotive Science：Automotive Environmental Science I

Class subject

  • オートモーティブ環境科学I

    2023.10 - 2024.3   Second semester

  • オートモーティブ環境科学I

    2022.10 - 2023.3   Second semester

  • オートモーティブ環境科学I

    2020.10 - 2021.3   Second semester

  • オートモーティブサイエンス演習I

    2020.4 - 2020.9   First semester

  • オートモーティブ環境科学I

    2019.4 - 2019.9   First semester

  • オートモーティブサイエンス演習I

    2019.4 - 2019.9   First semester

  • オートモーティブ環境科学I

    2024.10 - 2025.3   Second semester

  • オートモーティブサイエンス演習IV

    2024.10 - 2025.3   Second semester

  • オートモーティブサイエンス演習II

    2024.10 - 2025.3   Second semester

  • Automotive Science Seminar 4

    2024.10 - 2025.3   Second semester

  • Automotive Science Seminar 3

    2024.10 - 2025.3   Second semester

  • Automotive Science Seminar 2

    2024.10 - 2025.3   Second semester

  • Automotive Science Seminar 1

    2024.10 - 2025.3   Second semester

  • オートモーティブサイエンス特別研究Ａ

    2024.4 - 2025.3   Full year

  • オートモーティブサイエンス特別研究Ａ

    2024.4 - 2025.3   Full year

  • インターンシップIV

    2024.4 - 2025.3   Full year

  • インターンシップIII

    2024.4 - 2025.3   Full year

  • インターンシップII

    2024.4 - 2025.3   Full year

  • インターンシップI

    2024.4 - 2025.3   Full year

  • インターンシップ

    2024.4 - 2025.3   Full year

  • Seminar Advanced Automotive Science3

    2024.4 - 2025.3   Full year

  • Seminar Advanced Automotive Science2

    2024.4 - 2025.3   Full year

  • Seminar Advanced Automotive Science1

    2024.4 - 2025.3   Full year

  • オートモーティブサイエンス演習III

    2024.4 - 2024.9   First semester

  • オートモーティブサイエンス演習I

    2024.4 - 2024.9   First semester

  • Automotive Science Seminar 4

    2024.4 - 2024.9   First semester

  • Automotive Science Seminar 3

    2024.4 - 2024.9   First semester

  • Automotive Science Seminar 2

    2024.4 - 2024.9   First semester

  • Automotive Science Seminar 1

    2024.4 - 2024.9   First semester

▼display all

Social Activities

  • ワークショップコレクションin福岡2019「光で作る未来のエネルギー」

    主催：NPO法人CANVAS／株式会社グッデイ 共催：九州大学  九州大学伊都キャンパス  2019.3

    　More details

    Audience： General,　Scientific,　Company,　Civic organization,　Governmental agency

    Type：Lecture

Media Coverage

  • Motonori Watanabe, "Creation of organic / inorganic composite materials by modifying dye structure and photocatalyst" Newspaper, magazine

    2021.10

    　More details

    Motonori Watanabe, "Creation of organic / inorganic composite materials by modifying dye structure and photocatalyst"