Language：Japanese  

DOI： 10.1038/ncomms12704

Language：Japanese  

DOI： 10.1021/acs.organomet.6b00309

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

<p>The removal of uremic toxins, such as indole, using carbon-based adsorbents is essential for preventing the progression of chronic kidney disease (CKD). Mesoporous carbon (MC) with a uniform pore diameter of 3.1 nm was used as an adsorbent for indole in aqueous media. The adsorption kinetics and thermodynamics of MC were examined, with the conventional adsorbent AST-120 serving as a control. Compared to AST-120, MC showed highly efficient indole adsorption and remarkable adsorption selectivity for indole in the presence of various amino acids. The excellent selectivity of MC has the potential to reduce the required dose of the adsorbent, thereby improving treatment strategies for patients with CKD.</p>

DOI： 10.7209/carbon.030304

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Publisher：Polymer Journal  

The surface modification of carbon materials is an effective method for enhancing the properties of carbon-based functional materials; particularly, the use of a polymer coating is advantageous owing to its intactness and simplicity. Polybenzimidazole (PBI) has been used to modify carbon surfaces, yet its adsorption behavior has not been thoroughly examined. In this study, the adsorption kinetics and thermodynamics of PBI adsorption on various types of carbon black with different surface morphologies and chemical compositions were analyzed via isotherm measurements. To determine the effects of the polymer, its adsorption behavior was compared to that of the PBI monomer (1,3-bis(1H-benzo[d]imidazol-2-yl)benzene (referred to as the PBI-unit)). The surface adsorption of PBI was slower than that of the PBI-unit; however, PBI exhibited a greater adsorption capacity. The PBI adsorption is an entropy-driven process, whereas PBI-unit adsorption is enthalpy-driven. The adsorption of PBI was more thermodynamically favorable on carbon surfaces with higher crystallinity (lower oxygenation) owing to the easier detachment of solvent molecules from the carbon surface, leading to a higher adsorption constant.

DOI： 10.1038/s41428-024-00950-5

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

The remarkable stability of gel-coated SWCNT dispersions enables length sorting using size exclusion chromatography. Length-sorted, gel-coated SWCNTs show photoluminescence in near IR and are ready to use for various applications including near IR imaging.

DOI： 10.1039/d3ma01069d

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

Near-infrared light in the second region (NIR-II, ∼1000–1400 nm) can penetrate biological tissues with minimal absorption and scattering, making it ideal for in vivo diagnostic imaging. However, most NIR-II-fluorescent materials lack adequate brightness and biocompatibility. One such example is single-walled carbon nanotube (SWCNT). In this study, we improved fluorescence brightness and biocompatibility of SWCNTs by coating them with gel of polyethylene glycol (PEG)-based cross-linked polymers, which was prepared by a one-pot method called “carbon nanotube micelle polymerization (CMP)”. The PEG confers SWCNT biocompatibility, and structural defects of SWCNT induced by CMP enhanced NIR-II fluorescence intensity. Due to these improvements, the gel-coated SWCNTs clearly imaged vasculatures in mice at a low dose of 8.4 μg/mouse, proving the potential use of gel-coated SWCNTs as high-quality bio-imaging agents.

DOI： 10.1016/j.carbon.2023.118728

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

Serum albumin (SA) is a protein found in biofluids that is useful for diagnosing kidney and liver-related diseases. Single-walled carbon nanotubes (SWCNTs) showing photoluminescence (PL) in the near-infrared (NIR) region are prospective candidates for diagnosis NIR probes. Their NIR PL enhancement has been reported by defect introduction techniques based on local chemical functionalization of SWCNTs. The locally functionalized (lf-)SWCNTs exhibit a bright defect PL (>1000 nm) from the defect sites and its sensitive wavelength shifts in response to surrounding dielectric atmospheres have been reported. Here, we used the sensitive defect PL responses of lf-SWCNTs to establish a NIR sensing system for SA detection. A palmitic acid group that binds to SA strongly and selectively, was functionalized at the defect site of lf-SWCNTs (lf-SWCNTs-p). Compared to typical PL of unmodified SWCNTs, selective defect PL red-shifts (of 2.5 nm max.) were clearly observed according to the addition of SA in phosphate-buffered saline. The defect PL responsiveness could detect different SA from human, bovine, and mouse. The red-shifts of the defect PL occurred by formation of a high dielectric environment based on the specific binding between SA and the palmitic acid groups on the defect sites. The lf-SWCNTs-p detected SA-spiked serum and albuminuria of diabetic mouse in body fluids. The findings show that the lf-SWCNTs-p offer an NIR PL analytical tool for SA in body fluids applicable to a disease diagnosis and expand the bioapplications of lf-SWCNTs based on their molecular design-based defect engineering.

DOI： 10.1016/j.carbon.2023.118533

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Language：Others   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

Abstract

Neutral radicals, including carbon radicals, are highly useful chemical species for the functionalization of semiconducting materials to change their electrical and optical properties owing to their high reactivity. However, boron radicals have been limited to synthetic and reaction chemistry, with rare utilization in materials science. In this study, a mixture of tetrahydroxydiboron (B₂(OH)₄) and pyridine derivatives was found to act as an electron dopant for single-walled carbon nanotubes (SWCNTs) because of the electron transfer from pyridine-mediated boron radicals generated by B–B bond dissociation to neutral radicals. In particular, the radical formed from a mixture of B₂(OH)₄ and 4-phenylpyridine ((4-Phpy)B(OH)₂^·) efficiently doped electrons into the SWCNT films; thus, n-type SWCNTs with long-term air stability for more than 50 days at room temperature were prepared. Furthermore, the experimental and theoretical surface analyses revealed that the formation of stable cations from ((4-Phpy)B(OH)₂^·) and the efficient interaction with SWCNTs due to their high planarity served as the mechanism for their stable doping.

DOI： 10.1038/s41598-023-48847-2

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Other Link： https://www.nature.com/articles/s41598-023-48847-2

Language：English   Publisher：Chemistry of Materials  

Alkylated fused expanded pyridinium (CxFEP) with alkyl chain lengths (x) of 0, 6, 12, and 18 was newly synthesized and introduced into polymers as side chains for anion-exchange membrane (AEM) applications. FEP is characterized by a large π cation that offers weak electrostatic interactions with anions such as hydroxide (OH-) ions and therefore leads to high OH- conductivity in AEM. CxFEP shows a synergetic effect between the π-π interactions of FEP and van der Waals interactions of the alkyl chains and forms a strong assembly, particularly for C6FEP. On the other hand, when CxFEP was introduced into the polymers, C12FEP formed an ordered stacking assembly in the films, whereas the other polymers with shorter (C0 and C6) and longer (C18) alkyl chains exhibited no such ordered structure. For the AEM, all of the polymers showed higher ion conductivities than that of commercial ammonium-based AEM, even with their low ion-exchange capacities (IEC), probably because of their characteristic weak interactions between the FEP cation and OH-. In particular, the AEM with C12FEP showed the highest ion conductivity of 143.3 ± 27.3 mS cm-1, even with a very low IEC of 0.41 mmol g-1. In addition to the high level of ion dissociation of FEP, the molecular assembly of FEP provides ionic conduction paths. This study demonstrates the importance of high ion dissociation and the formation of a conduction pathway for AEM with high conductivity.

DOI： 10.1021/acs.chemmater.3c01329

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Language：English   Publisher：Polymer Journal  

We synthesized a styrene-based polymer containing fused expanded pyridinium (FEP) moieties as side chains for an anion exchange membrane. FEPs were incorporated into poly(4-azidomethylstyrene) via copper-catalyzed alkyne-azide cycloaddition (click chemistry) to yield an FEP content of 10.5 mol%, which depended on the FEP feed ratio. The FEP polymer membrane containing 10.5 mol% of FEP exhibited high hydroxide conductivity of 123.4 (±13.3) mS cm–1 with a relatively low ion-exchange capacity of 0.77 (±0.03) at 80 °C under 80% relative humidity. Density functional theory studies revealed that FEP is a considerably soft acid owing to substantial delocalization of the positive charge in the rigid π structure. The high ion conductivity and low ion-exchange capacity can be attributed to weak interactions between the hard base (hydroxide ions) and soft acid (FEP).

DOI： 10.1038/s41428-022-00730-z

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Journal of Applied Physics  

Semiconducting single-walled carbon nanotubes (s-SWCNTs) are promising materials for thermoelectric generation (TEG) because of their large theoretical Seebeck coefficient (S). In this study, to discuss superiority of s-SWCNTs for TEG devices, thermoelectric properties of free-standing s-SWCNT sheets were compared with unsorted SWCNT sheets. To obtain the highest power density, the films were doped with triethyloxonium hexachloroantimonate and 2-(2-methoxyphenyl)-1,3-dimethyl-2,3-dihydro-1H-benzo[d]imidazole as the hole and electron dopants, respectively. The doped s-SWCNT sheets exhibited higher S but lower electrical conductivity than those of the unsorted SWCNT sheets. Consequently, the power factor of the s-SWCNT sheets was lower than that of the unsorted SWCNT sheets.

DOI： 10.35848/1347-4065/ac9e82

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

Catalyst layers (CL) composed of catalyst composites and an ionomer are key components in polymer electrolyte membrane fuel cells (PEMFCs). In particular, the preparation conditions of the CL, starting from the dispersion of the catalyst composite dispersion with an ionomer, largely affect the PEMFC performance. In this study, the effects of alcohol content in the dispersion solvent were investigated using two binary mixtures composed of water and ethanol. In addition, Pt-loaded carbon black (CB) and Pt-loaded polymer-wrapped CB were used as the catalyst composites to study the effects of the alcohol contents on the interaction between ionomer and surface of the carbon supports. The CL prepared using the water-rich (80 wt% water) solvent achieved a higher PEMFC performance compared to that using the alcohol-rich (13 wt% water) solvent, which is ascribed to the stronger interaction between the ionomer and CB surface under water-rich conditions. Using the polymer-wrapped CB, the difference of the PEMFC performance between the CLs from the water-rich and alcohol-rich dispersions was minimal because of the comparable interaction between the ionomer and wrapping polymer surface in both solvents. Therefore, the control of the interaction between the ionomer and catalyst composites is crucial to controlling the PEMFC performance.

DOI： 10.1016/j.ijhydene.2022.11.116

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

Boron nitride nanotubes (BNNTs) are chemically functionalized by a reductive alkylation reaction for defect doping to create luminescent defects. The hexyl group attachment on the BNNT wall results in sp3 boron atom defect formation in the BN network, by which defect photoluminescence from the functionalized BNNTs is newly observed in a UVvis region. This chemistry-based defect doping technique offers an attractive tool for bandgap engineering of BNNTs.

DOI： 10.1246/cl.220467

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Language：Others   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry ({RSC})  

Molecular doping is a key process to increase the density of charge carriers in organic semiconductors. Doping-induced charges in polymer semiconductors result in the formation of polarons and/or bipolarons due to the strong electron-vibron coupling in conjugated organic materials. Identifying the nature of charge carriers in doped polymers is essential to optimize the doping process for applications. In this work, we use Raman spectroscopy to investigate the formation of charge carriers in molecularly doped poly(3-hexylthiophene-2,5-diyl) (P3HT) for increasing dopant concentration, with the organic salt dimesityl borinium tetrakis(penta-fluorophenyl)borate (Mes2B+ [B(C6F5)4]-) and the Lewis acid tris(pentafluorophenyl)borane [B(C6F5)3]. While the Raman signatures of neutral P3HT and singly charged P3HT segments (polarons) are known, the Raman spectra of doubly charged P3HT segments (bipolarons) are not yet sufficiently understood. Combining Raman spectroscopy measurements on doped P3HT thin films with first-principles calculations on oligomer models, we explain the evolution of the Raman spectra from neutral P3HT to increasingly doped P3HT featuring polarons and eventually bipolarons at high doping levels. We identify and explain the origin of the spectral features related to bipolarons by tracing the Raman signature of the symmetric collective vibrations along the polymer backbone, which-compared to neutral P3HT-redshifts for polarons and blueshifts for bipolarons. This is explained by a planarization of the singly charged P3HT segments with polarons and rather high order in thin films, while the doubly charged segments with bipolarons are located in comparably disordered regions of the P3HT film due to the high dopant concentration. Furthermore, we identify additional Raman peaks associated with vibrations in the quinoid doubly charged segments of the polymer. Our results offer the opportunity for readily identifying the nature of charge carriers in molecularly doped P3HT while taking advantage of the simplicity, versatility, and non-destructive nature of Raman spectroscopy. This journal is

DOI： 10.1039/D1CP04985B

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

One of the advantages of CNT-based fuel cell catalysts is the formation of free-standing sheets based on filtration. The sheets have a smoother side depending on the filtration direction, which result in the higher performance in the cell.

DOI： 10.1039/d2se00857b

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

DOI： DOIhttps://doi.org/10.1039/D1CP04985B

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

We report the successful synthesis of tetramesityldiborane(4) (Mes4B2) through the reductive coupling of a dimesitylborinium ion. Owing to the steric protection conferred by the mesityl groups, Mes4B2 shows exceptional chemical stability and remains intact in water. Single-crystal X-ray analysis revealed that Mes4B2 has an orthogonal geometry, where the B–B center is completely hidden by the mesityl groups. Remarkably, Mes4B2 emits dual fluorescence at 460 and 620 nm, both in solution and in the solid state. Theoretical calculations showed that Mes4B2 in the excited S1 state adopts a twisted or planar geometry, which is responsible for the shorter- or longer-wavelength fluorescence, respectively. The intensity ratio of the dual fluorescence is sensitive to the viscosity of the medium, which suggests that Mes4B2 has potential as a ratiometric viscosity sensor.

DOI： 10.1002/anie.202113549

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/anie.202113549

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

Trifluoromethanesulfonylimide-grafted polybenzimidazole (PBI-TFSI) was synthesized for proton exchange membrane (PEM) applications. Its proton conductivity was (a) less dependent on humidity and (b) higher than that of conventional fluorine-based PEM (Nafion) and propanesulfonic acid-grafted PBI (PBI-PS) at a relative humidity of 40&#37;. The chemical structure of PBI-TFSI was investigated using 1H and 19F nuclear magnetic resonance and Fourier transform infrared spectroscopy. The membranes exhibited good transparency, flexibility, and thermal stability up to 350 °C. Membranes with different side chain grafting ratios were prepared, and the water uptake and hydration number of the PBI-TFSI membranes were lower than those of the PBI-PS membranes, most likely because of the hydrophobicity of the side chain. The higher proton concentration provided by TFSI with stronger acidity than PS might be the reason for the higher proton conductivities of PBI-TFSI.

DOI： 10.1038/s41428-021-00551-6

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

DOI： 10.1002/ange.202113549

Language：English  

Language：English  

Language：English  

近年開発が盛んに行われている機能性超分子ポリマーの作製に向けて、今回新たにフラストレイテドルイスペアーを組み込んだ超分子共重合体を作製し、その特異な光学特性を明らかにした。また共重合体の微細構造を分光測定、理論化学計算から考察し、集積体形成のメカニズムを評価した。

Language：English  

DOI： 10.1002/advs.202001322

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

Formation of environmentally stable hole-doped graphene films with instantaneous and high-density carrier doping via a boron-based oxidant
Large-area graphene films have substantial potential for use as next-generation electrodes because of their good chemical stability, high flexibility, excellent carrier mobility, and lightweight structure. However, various issues remain unsolved. In particular, high-density carrier doping within a short time by a simple method, and air stability of doped graphene films, are highly desirable. Here, we demonstrate a solution-based high-density (>10(14) cm(-2) ) hole doping approach that promises to push the performance limit of graphene films. The reaction of graphene films with a tetrakis(pentafluorophenyl)borate salt, containing a two-coordinate boron cation, achieves doping within an extremely short time (4 s), and the doped graphene films are air stable for at least 31 days. X-ray photoelectron spectroscopy reveals that the graphene films are covered by the chemically stable anions, resulting in an improved stability in air. Moreover, the doping reduces the transmittance by only 0.44 +/- 0.23&#37;. The simplicity of the doping process offers a viable route to the large-scale production of functional graphene electrodes.

DOI： 10.1038/s41699-019-0090-x

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

Chemical hole doping into large-area transition metal dichalcogenide monolayers using boron-based oxidant
Hole carrier doping into single-crystalline transition metal dichalcogenide (TMDC) films can be achieved with various chemical reagents. However, large-area polycrystalline TMDC monolayers produced by a chemical vapor deposition (CVD) growth method have yet to be chemically doped. Here, we report that a salt of a two-coordinate boron cation, Mes(2)B(+) (Mes: 2,4,6-trimethylphenyl group), with a chemically stable tetrakis( pentafluorophenyl) borate anion, [(C6F5)(4)B](-), can serve as an efficient hole-doping reagent for large-area CVD-grown tungsten diselenide (WSe2) films. Upon doping, the sheet resistance of large-area polycrystalline WSe2 monolayers decreased from 90 G Omega/sq to 3.2 k Omega/sq. (C) 2018 The Japan Society of Applied Physics

DOI： 10.7567/JJAP.57.02CB15

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

DOI： 10.1002/anie.201703069

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

DOI： 10.1002/ange.201703069

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

© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Borinium ions, that is, two-coordinate boron cations, are the most electron-deficient isolable boron compounds. As borinium ions have only four formal valence electrons on boron, they should show a strong tendency to accept electron pairs on the boron atom to fill its valence shell. Thus chemical reactions of borinium ions are expected to give products in which the coordination number of boron is increased from two to three or four. However, contrary to this expectation, we found that the dimesitylborinium ion (Mes2B+) undergoes twofold 1,2-carboboration reactions with two equivalents of diphenylacetylene to yield an unprecedented borinium ion (1+) with two substituted vinyl groups on the boron center. NMR spectroscopy and X-ray diffraction analysis of 1+, together with electronic-structure calculations, revealed that the positive charge is delocalized over the entire π-conjugated system. The fact that the chemical transformation of a borinium ion gives rise to a different borinium ion without a change in the coordination number is remarkable and should provide new insight into the chemistry of the Group 13 elements.

DOI： 10.1002/anie.201701730

Language：Japanese  

Highly air- and moisture-stable hole-doped carbon nanotube films achieved using boron-based oxidant
Hole doping into carbon nanotubes can be achieved. However, the doped nanotubes usually suffer from the lack of air and moisture stability, thus, they eventually lose their improved electrical properties. Here, we report that a salt of the two-coordinate boron cation Mes<inf>2</inf>B⁺(Mes: 2,4,6-trimethylphenyl group) can serve as an efficient hole-doping reagent to produce nanotubes with markedly high stability in the presence of air and moisture. Upon doping, the resistances of the nanotubes decreased, and these states were maintained for one month in air. The hole-doped nanotube films showed a minimal increase in resistance even upon humidification with a relative humidity of 90&#37;.

DOI： 10.7567/APEX.10.035101

Language：Japanese  

DOI： 10.1021/jacs.6b11984

Language：Japanese  

DOI： 10.1039/C5CC05645D

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

A two-coordinate boron cation featuring C-B + -C bonding
Two-coordinate boron cations (R 2 B +), referred to as borinium ions, are chemical species in which the boron bears only four valence electrons, and that are isoelectronic with hypothetical carbon dications (R 2 C 2+). Although lone-pair-donating substituents such as amino groups have enabled the isolation of several borinium ions, diarylated and dialkylated borinium derivatives remain entirely unexplored. Here, we present the synthesis, structure and reactivity of the dimesitylborinium ion, which displays unexpectedly high thermal stability. X-ray crystallography and 11 B NMR spectroscopy, supported by density functional theory calculations, reveal that the borinium ion adopts a linear two-coordinate structure in both the solid state and in solution. The boron centre is stabilized by p € bonding from the mesityl groups and is free from coordination by the counterion or solvent molecules. This diarylborinium ion possesses exceptional Lewis acidity, accepting a pair of electrons from CO 2 to cause an unusual deoxygenation reaction. © 2014 Macmillan Publishers Limited.

DOI： 10.1038/nchem.1948

Event date： 2023.10 - 2023.11

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

Venue：Korea university   Country：Japan  

Event date： 2023.10 - 2023.11

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

Venue：Korea university   Country：Japan  

Event date： 2023.10

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

Venue：タワーホール船堀   Country：Japan  

Event date： 2023.10

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

Venue：Kyushu university   Country：Japan  

Event date： 2023.10

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

Venue：九州大学   Country：Japan  

Event date： 2023.10

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Venue：九州大学   Country：Japan  

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Venue：Kyushu university   Country：Japan  

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Event date： 2023.9

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Venue：北九州国際会議場   Country：Japan  

Event date： 2023.9

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Venue：熊本城ホール   Country：Japan  

Event date： 2023.7

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Venue：札幌コンベンションセンター   Country：Japan  

Event date： 2023.7

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Venue：北九州国際会議場   Country：Japan  

Event date： 2023.7

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Venue：北九州国際会議場   Country：Japan  

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Venue：北九州国際会議場   Country：Japan  

Event date： 2023.3

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Venue：東北工業大学   Country：Japan  

Event date： 2023.3

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Venue：東京理科大学   Country：Japan  

Event date： 2023.3

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Venue：東京理科大学   Country：Japan  

Event date： 2023.3

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Venue：東京理科大学   Country：Japan  

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Venue：東京理科大学   Country：Japan  

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Venue：東京理科大学   Country：Japan  

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Venue：上智大学   Country：Japan  

Event date： 2023.3

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Venue：名古屋大学   Country：Japan  

Event date： 2022.12

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Venue：オンライン   Country：Japan  

Event date： 2022.12

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2022.10 - 2023.10

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Venue：北九州国際会議場   Country：Japan  

Event date： 2022.10

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Venue：北九州国際会議場   Country：Japan  

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Event date： 2022.9

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Venue：東北大学　川内北キャンパス   Country：Japan  

Event date： 2022.9

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Venue：岡山大学　津島キャンパス   Country：Japan  

Event date： 2022.9

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Venue：北海道大学 札幌キャンパス   Country：Japan  

Event date： 2022.9

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Venue：北海道大学 札幌キャンパス   Country：Japan  

Event date： 2022.9

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Venue：北海道大学 札幌キャンパス   Country：Japan  

Event date： 2022.9

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Venue：北海道大学 札幌キャンパス   Country：Japan  

Event date： 2022.9

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Venue：北海道大学 札幌キャンパス   Country：Japan  

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Venue：北九州国際会議場   Country：Japan  

Event date： 2022.7

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Venue：北九州国際会議場   Country：Japan  

Event date： 2022.7

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Venue：北九州国際会議場   Country：Japan  

Event date： 2022.5

Language：English   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2022.3

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Venue：オンライン   Country：Japan  

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Venue：オンライン   Country：Japan  

Event date： 2021.12

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Venue：パシフィコ横浜   Country：Japan  

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.10

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

Venue：オンライン   Country：Japan  

Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2021.9 - 2021.10

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

Venue：オンライン   Country：Japan  

熱電変換材料として単層カーボンナノチューブ (SWCNT) が注目されている。熱電変換デバイスの構築にはp型とn型両方の熱電材料が必要であるが、SWCNTは大気酸化により通常p型の性質を示す。当研究室では最近、ドーパントにピリジン-ホウ素ラジカルを用いてSWCNTのn型化に成功したが、作製したn型SWCNTは大気酸化によるp型化を示し、n型安定性は獲得できていない。そこで、本研究では異なるドーパント構造を用いて、SWCNTのn型安定化を試みた。

Event date： 2021.7 - 2021.10

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

Venue：オンライン   Country：Japan  

単層カーボンナノチューブ (SWCNT) は、高い電気伝導率や加工性、軽量性を有する点から、熱電発電分野において注目を集めている。熱電変換デバイスを構築するためにはp型とn型両方のSWCNTが必要であるが、n型SWCNTは大気酸化によるp型化が進行するため、p型と比較して報告例が少ない。最近、当研究室ではビスピナコラートジボラン (B2pin2) とピリジン誘導体を混合することで生成するピリジン-ホウ素ラジカルを用いて、SWCNTのn型化に成功している[1]。しかし作製したn型SWCNTは数日の経過で大気酸化によるp型化を示し、n型安定性は獲得できていない。そこで本研究では、ジボラン構造を立体障害の小さいテトラヒドロキシジボラン (B2(OH)4) に変更し、種々のピリジン誘導体を混合してn型SWCNTを作製することで、ドーパント構造がn型安定性に及ぼす影響を調査することを目的とした。

Event date： 2021.7

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.7

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.5

Language：Japanese  

Venue：オンライン   Country：Japan  

Event date： 2021.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.9 - 2022.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.9 - 2022.5

Language：Japanese  

Venue：オンライン   Country：Japan  

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Event date： 2020.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2020.9

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

Venue：オンライン   Country：Japan  

Event date： 2019.12

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2019.7 - 2022.7

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2019.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Language：Japanese  

Language：Japanese  

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