未利用熱エネルギー回収のための酸化物熱電材料の開発
キーワード:熱電変換材料,酸化物半導体,エネルギー変換材料,導電性セラミックス、熱伝導率、酸化亜鉛、ペロブスカイト型酸化物、層状コバルト酸化物、ナノボイド、ナノコンポジット
1991.07.
大瀧 倫卓(おおたき みちたか) | データ更新日:2023.11.27 |
主な研究テーマ
中高温廃熱回収用酸化物熱電モジュールの開発
キーワード:酸化亜鉛、層状コバルト酸化物、微細構造制御、高速高密度実装、電極接合技術、長期安定性評価、
2002.11.
キーワード:酸化亜鉛、層状コバルト酸化物、微細構造制御、高速高密度実装、電極接合技術、長期安定性評価、
2002.11.
低次元量子閉じ込め構造を持つ無機ナノ物質の自己組織合成と物性
キーワード:低次元ナノ物質、分子集合体、自己組織化、ナノ超格子、光触媒、磁性、無機有機複合体
1996.04.
キーワード:低次元ナノ物質、分子集合体、自己組織化、ナノ超格子、光触媒、磁性、無機有機複合体
1996.04.
特異量子物性を示す超集積構造の構築とナノ構造物性
キーワード:超集積量子構造、空間規則性、ナノスペース、層間相互後作用
1998.04.
キーワード:超集積量子構造、空間規則性、ナノスペース、層間相互後作用
1998.04.
従事しているプロジェクト研究
溶射法を利用した 熱電変換モジュールの研究開発
2017.04~2018.03, 代表者:増住 大地, (株)フジコー, 新エネルギー・産業技術総合開発機構
従来、バルク体で作製されてきた熱電変換素子について、表面コーティング技術の一種であり、低コスト化が実現可能な溶射法を用いた素子およびモジュールの高性能化を図り、熱源への設置および実用化を目指す。.
2017.04~2018.03, 代表者:増住 大地, (株)フジコー, 新エネルギー・産業技術総合開発機構
従来、バルク体で作製されてきた熱電変換素子について、表面コーティング技術の一種であり、低コスト化が実現可能な溶射法を用いた素子およびモジュールの高性能化を図り、熱源への設置および実用化を目指す。.
OTE-POWER – Oxide thermoelectrics for effective power generation from waste heat
2011.01~2014.12, 代表者:Nini Pryds, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, Danish Council for Independent Research, Technology and Production(デンマーク)
廃熱エネルギー発電を目的とした酸化物熱電モジュールの開発.
2011.01~2014.12, 代表者:Nini Pryds, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, Danish Council for Independent Research, Technology and Production(デンマーク)
廃熱エネルギー発電を目的とした酸化物熱電モジュールの開発.
知的クラスター創成事業「超高効率化を実現するナノ構造熱電発電モジュールの開発」
2009.04~2012.03, 代表者:横野 照尚, 九州工業大学, 財団法人福岡県産業・科学技術振興財団
超高効率化を実現するナノ構造熱電発電モジュールの開発.
2009.04~2012.03, 代表者:横野 照尚, 九州工業大学, 財団法人福岡県産業・科学技術振興財団
超高効率化を実現するナノ構造熱電発電モジュールの開発.
多元ドープによるバルクナノコンポジット構造ZnO系酸化物熱電材料の開発
2008.07~2009.03, 代表者:大瀧 倫卓, 九州大学, 科学技術振興機構
地域イノベーション創出総合支援事業 重点地域研究開発推進プログラム「シーズ発掘試験」.
2008.07~2009.03, 代表者:大瀧 倫卓, 九州大学, 科学技術振興機構
地域イノベーション創出総合支援事業 重点地域研究開発推進プログラム「シーズ発掘試験」.
セラミックハニカムを用いた高密度実装酸化物熱電発電モジュールの開発
2006.10~2007.02, 代表者:大瀧 倫卓, 九州大学, 科学技術振興機構
地域イノベーション創出総合支援事業 重点地域研究開発推進プログラム「シーズ発掘試験」.
2006.10~2007.02, 代表者:大瀧 倫卓, 九州大学, 科学技術振興機構
地域イノベーション創出総合支援事業 重点地域研究開発推進プログラム「シーズ発掘試験」.
500℃級排熱回収用熱電発電素子の開発
2003.02~2005.09, 代表者:大瀧 倫卓, 九州大学, 独立行政法人 科学技術振興機構
科学技術振興機構 重点地域研究開発促進事業
研究成果活用プラザ福岡 育成研究 大瀧プロジェクト
「500℃級排熱回収用熱電発電素子の開発」.
2003.02~2005.09, 代表者:大瀧 倫卓, 九州大学, 独立行政法人 科学技術振興機構
科学技術振興機構 重点地域研究開発促進事業
研究成果活用プラザ福岡 育成研究 大瀧プロジェクト
「500℃級排熱回収用熱電発電素子の開発」.
ナノブロックインテグレーションによる層状酸化物熱電材料の創製
2002.11~2008.03, 代表者:河本 邦仁, 名古屋大学, 独立行政法人 科学技術振興機構
科学技術振興機構 戦略的創造研究推進事業(CREST)
「エネルギーの高度利用に向けたナノ構造材料・システムの創製」研究領域(藤嶋 昭 領域代表)
「ナノブロックインテグレーションによる層状酸化物熱電材料の創製」
九大グループリーダー.
2002.11~2008.03, 代表者:河本 邦仁, 名古屋大学, 独立行政法人 科学技術振興機構
科学技術振興機構 戦略的創造研究推進事業(CREST)
「エネルギーの高度利用に向けたナノ構造材料・システムの創製」研究領域(藤嶋 昭 領域代表)
「ナノブロックインテグレーションによる層状酸化物熱電材料の創製」
九大グループリーダー.
研究業績
主要著書
主要原著論文
1. | Bui Duc LONG, Le Hong THANG, Nguyen Hong HAI, Koichiro SUEKUNI, Katsuaki HASHIKUNI, TRAN Quang Minh Nhat, Wojciech KLICH, Michitaka OHTAKI, Thermoelectric Quaternary Sulfide Cu2+xZn1−xSnS4 (x = 0–0.3): Effects of Cu substitution for Zn, Materials Science and Engineering B, 10.1016/j.mseb.2021.115353, 272, 115353, 2021.07. |
2. | Yuta SHIMIZU, Koichiro SUEKUNI, Hikaru SAITO, Pierric LEMOINE, Emmanuel GUILMEAU, Bernard RAVEAU, Raju CHETTY, Michihiro OHTA, Toshiro TAKABATAKE, Michitaka OHTAKI, Synergistic Effect of Chemical Substitution and Insertion on the Thermoelectric Performance of Cu26V2Ge6S32 Colusite, Inorganic Chemistry, 10.1021/acs.inorgchem.1c01321, accepted for publication on 6 July 2021., 2021.07. |
3. | Rauf KHAN, Michitaka OHTAKI, Satoshi HATA, Koji MIYAZAKI, Reiji HATTORI, Thermal Conductivity of Nano-Crystallized Indium-Gallium-Zinc Oxide Thin Films Determined by Differential Three-Omega Method, Nanomaterials, 10.3390/nano11061547, 11, 6, 1547 (10 pages), 2021.06. |
4. | Ahrong JEONG, Koichiro SUEKUNI, Michitaka OHTAKI, Byung Koog JANG, Thermoelectric Properties of In- and Ga-doped Spark Plasma Sintered ZnO Ceramics, Ceramics International, 10.1016/j.ceramint.2021.05.101, in press, available online 19 May 2021., 2021.05. |
5. | Nhat Quang Minh TRAN, Michitaka OHTAKI, Koichiro SUEKUNI, Rapid Synthesis of W18O49 via Reactive Spark Plasma Sintering with Controlled Anisotropic Thermoelectric Properties, Evergreen, 8, 2, accepted for publication on 16 May 2021., 2021.05. |
6. | Takashi HAGIWARA, Koichiro SUEKUNI, Pierric LEMOINE, Andrew R. SUPKA, Raju CHETTY, Emmanuel GUILMEAU, Bernard RAVEAU, Marco FORNARI, Michihiro OHTA, Rabih Al Rahal Al ORABI, Hikaru SAITO, Katsuaki HASHIKUNI, Michitaka OHTAKI, Key Role of d0 and d10 Cations for the Design of Semiconducting Colusites: Large Thermoelectric ZT in Cu26Ti2Sb6S32 Compounds, Chemistry of Materials, 10.1021/acs.chemmater.1c00872, 33, 9, 3449-3456, 2021.04. |
7. | Katsuaki HASHIKUNI, Koichiro SUEKUNI, Hidetomo USUI, Raju CHETTY, Michihiro OHTA, Toshiro TAKABATAKE, Michitaka OHTAKI, A Comparative Study of Thermoelectric Cu2TrTi3S8 (Tr = Co and Sc) Thiospinels: Enhanced Seebeck Coefficient via Electronic Structure Modification, Journal of Alloys and Compounds, 10.1016/j.jallcom.2021.159548, 871, 159548 (9 pages), 2021.03. |
8. | Wojciech KLICH, Michitaka OHTAKI, Thermoelectric Properties of Mo-doped Bulk In2O3 and Prediction of its Maximum ZT, Ceramics International, 10.1016/j.ceramint.2021.03.129, 47, 13, 18116-18121, 2021.03. |
9. | Sampad GHOSH, Sivasankaran HARISH, Michitaka OHTAKI, Bidyut Baran SAHA, Thermoelectric Figure of Merit Enhancement in Cement Composites with Graphene and Transition Metal Oxides, Materials Today Energy, 10.1016/j.mtener.2020.100492, 18, 100492 (6 pages), 2020.08. |
10. | Shinji HIRATA, Michitaka OHTAKI, Kosuke WATANABE, Highly Improved Thermoelectric Performance of Nb-doped SrTiO3 due to Significant Suppression of Phonon Thermal Conduction by Synergetic Effects of Pores and Metallic Nanoparticles, Ceramics International, 10.1016/j.ceramint.2020.07.085, 46, 16A, 25964-25969, 2020.07. |
11. | Anh Tuan Thanh Pham, Tuyen Anh Luu, Ngoc Kim Pham, Hanh Kieu Thi Ta, Truong Huu Nguyen, Dung Van Hoang, Hoa Thi Lai, Vinh Cao Tran, Jong Ho Park, Jae Ki Lee, Sungkyun Park, Ohtaki Michitaka, Su Dong Park, Hung Quang Nguyen, Thang Bach Phan, Multi-scale defects in ZnO thermoelectric ceramic materials co-doped with In and Ga, Ceramics International, 10.1016/j.ceramint.2020.01.084, 46, 8, 10748-10758, 2020.06, [URL], In this work, several X-ray and nuclear analysis techniques were used to examine ZnO materials co-doped with In and Ga, or IGZO materials. X-ray diffraction analysis, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy revealed multi-scale defects in the materials. A nanoscale secondary Ga2Zn9O12 spinel phase, mesoscale grain boundaries, and atomic-scale lattice defects were detected. The lattice defects included oxygen vacancies, zinc vacancies, and complex defects. Positron annihilation spectroscopy and Doppler broadening spectroscopy provided evidence of interactions between charge carriers and defects sites, which explained the low thermal conductivities of the IGZO materials (κtotal ≈ 3.9 W/mK) at 773 K. This combination of X-ray and nuclear analytical techniques can be viewed as a novel approach for investigating the thermoelectric properties of materials with complex crystal structures that contain atomic-scale voids, nanoscale secondary phases, and mesoscale grain boundaries.. |
12. | Dung Van HOANG, Anh Tuan Thanh PHAM, Hanh Kieu Thi TA, Truong Huu NGUYEN, Ngoc Kim PHAM, Lai Thi HOA, Vinh Cao TRAN, Michitaka OHTAKI, Quang Minh Nhat TRAN, Jong-Ho PARK, Jae-Ki LEE, Su-Dong PARK, Tae-Seong JU, Hongjun PARK, Sungkyun PARK, Thang Bach PHAN, Effects of Multi-scale Defects on the Thermoelectric Properties of Delafossite CuCr1-xMgxO2 Materials, Journal of Alloys and Compounds, 10.1016/j.jallcom.2020.156119, 844, 156119, 2020.06. |
13. | Takuya Tanimoto, Koichiro Suekuni, Taiki Tanishita, Hidetomo Usui, Terumasa Tadano, Taiga Kamei, Hikaru Saito, Hirotaka Nishiate, Chul Ho Lee, Kazuhiko Kuroki, Michitaka Ohtaki, Enargite Cu3PS4: A Cu–S-Based Thermoelectric Material with a Wurtzite-Derivative Structure, Advanced Functional Materials, 10.1002/adfm.202000973, 30, 22, 2000973, 2020.05, [URL], Compound semiconductors derived from ZnS (zincblende and wurtzite) with tetrahedral framework structures have functions for various applications. Examples of such materials include Cu–S-based materials with zincblende-derivative structures, which have attracted attention as thermoelectric (TE) materials over the past decade. This study illuminates superior TE performance in polycrystalline samples of enargite Cu3P1−xGexS4 with a wurtzite-derivative structure. The substitution of Ge for P dopes holes into the top of the valence band composed of Cu-3d and S-3p, whereby its multiband characteristic leads to a high TE power factor. Furthermore, a reduction in the grain size to 50–300 nm can effectively decrease phonon mean free paths, leading to low thermal conductivity. These features result in a dimensionless TE figure of merit ZT of 0.5 at 673 K for the x = 0.2 sample. Environmentally benign and low-cost characteristics of the constituent elements of Cu3PS4, as well as its high-performance thermoelectricity, make it a promising candidate for large-scale TE applications. Furthermore, this finding extends the development field of Cu–S-based TE materials to those with wurtzite-derivative structures.. |
14. | Sampad Ghosh, Sivasankaran Harish, Michitaka Ohtaki, Bidyut Baran Saha, Enhanced figure of merit of cement composites with graphene and ZnO nanoinclusions for efficient energy harvesting in buildings, Energy, 10.1016/j.energy.2020.117396, 198, 2020.05, [URL], In this work, we have reported the thermoelectric performance of graphene-zinc oxide hybrid cement composites for the first time. Nanostructured graphene and zinc oxide were incorporated into cement to increase the thermoelectric properties of cement composites. The as-received materials were blended, compressed, and subsequently cured at room temperature to make it bulk. On bulk samples, electrical conductivity, Seebeck coefficient, and thermal conductivity were measured. As a consequence of high electrical conductivity and the Seebeck coefficient, the composites exhibited a high value of thermoelectric efficiency. The maximum figure of merit (ZT) of 0.01 is obtained when the contents of graphene and ZnO are 10 wt%, respectively, by mass of cement. This ZT is the highest reported to date for the thermoelectric cement composites, a nearly 70% increase over the previous record with carbon based inclusions. High figure of merit is crucial for energy harvesting applications in future buildings.. |
15. | Shinji Hirata, Michitaka Ohtaki, Simultaneous enhancement in the electrical conductivity and reduction in the lattice thermal conductivity leading to enhanced thermoelectric zt realized by incorporation of metallic nanoparticles into oxide matrix, Evergreen, 10.5109/2740934, 7, 1, 1-6, 2020.03, [URL], Nanoporous Fe3O4 composites containing metallic Cu nanoparticles were synthesized by reducing-leaching treatment of CuFe2O4 precursor. Thermoelectric properties of the composites sintered at 1270 ºC greatly improved compared with Fe3O4 without Cu, presumably due to a nanoporous structure and the Cu nanoparticles remaining in the Fe3O4 matrix after acid leaching. The electrical and thermal conductivity indicate that Cu in the matrix promotes the electron conduction and suppresses the phonon conduction, improving the dimensionless figure-of-merit, ZT.. |
16. | Taiki Tanishita, Koichiro Suekuni, Hirotaka Nishiate, Chul Ho Lee, Michitaka Ohtaki, A strategy for boosting the thermoelectric performance of famatinite Cu3SbS4, Physical Chemistry Chemical Physics, 10.1039/c9cp06233e, 22, 4, 2081-2086, 2020.01, [URL], Famatinite Cu3SbS4 has attracted attention for its potential application in thermoelectric (TE) contexts. In this work, we report the impacts of co-substituting Ge and P for Sb on TE properties. Melting and heat treatment methods were adopted to synthesize samples of Cu3Sb1-x-yGexPyS4 (x ≤ 0.4, y ≤ 0.3). In this system, Ge functioned as an acceptor for doping a hole to the valence band, which led to enhancement of the TE power factor. Contrastingly, P barely altered the electronic structure. Furthermore, both Ge and P acted as point defects, which effectively decreased lattice thermal conductivity. The combined effects of the co-substitution gave rise to an enhanced dimensionless figure of merit, ZT, of 0.67 at 673 K.. |
17. | Sampad Ghosh, Sivasankaran Harish, Kaiser Ahmed Rocky, Michitaka Ohtaki, Bidyut Baran Saha, Graphene enhanced thermoelectric properties of cement based composites for building energy harvesting, Energy and Buildings, 10.1016/j.enbuild.2019.109419, 202, 2019.11, [URL], Cement based thermoelectric materials can convert the available ambient heat absorbed by the building surfaces in summer into electrical energy. These materials can have an impact on the improvement of indoor climate of buildings, reduction of energy consumption and energy harvesting applications especially in the urban areas. In this paper, the thermoelectric properties of cement based composites with graphene nanoplatelets (GNP) inclusions were reported for the first time. GNP-cement mixtures were prepared by planetary ball milling and compressed subsequently to form bulk composites. We report the maximum electrical conductivity of 16.2 Scm−1 and Seebeck coefficient of +34.0 µVK−1 in this work. Hall measurement was performed to determine the material type and carrier concentration. It was found that all specimen exhibit p-type semiconductor behavior. Thermal diffusivity measurements were carried out using laser flash measurement technique. The highest figure of merit 0.44 × 10−3 was achieved at about 70 °C. Enhanced thermoelectric properties of graphene nanoplatelets cement based composites have a promising prospect in the urban heat island effect alleviation, thus saving electricity consumption and energy harvesting.. |
18. | Koichiro Suekuni, Hidetomo Usui, Siying Qiao, Katsuaki Hashikuni, Tatsuya Hirano, Hirotaka Nishiate, Chul Ho Lee, Kazuhiko Kuroki, Kosuke Watanabe, Michitaka Ohtaki, Electronic structure and thermoelectric properties of Sn1.2-xNbxTi0.8S3 with a quasi-one-dimensional structure, Journal of Applied Physics, 10.1063/1.5093183, 125, 17, 2019.05, [URL], We report the electronic structure and thermoelectric properties of a tin titanium trisulfide, Sn1.2Ti0.8S3. The crystal structure is composed of infinite "ribbons" of double edge-sharing (Sn4+/Ti4+)S6 octahedra capped by Sn2+. First-principles calculations predict a nearly unidirectional transport of electrons along the ribbon axis for a single crystal and the existence of lone-pair electrons on Sn2+. Experiments on polycrystalline pressed samples demonstrate that Sn1.2Ti0.8S3 exhibits semiconducting temperature dependence of electrical resistivity and a large negative Seebeck coefficient at room temperature. Substitution of Nb5+ for Sn4+ at the octahedral sites increases the electron carrier concentration, leading to an enhancement of the thermoelectric power factor. Anisotropy in the electronic properties is weak because of a weak orientation of the ribbon axis of crystallites in the pressed sample. The lattice thermal conductivity is less than 1 W K-1m-1 for the pristine and substituted samples, which is attributed to weak bonding between the ribbons via the lone-pair electrons of Sn2+ and to random occupation of S4+, Ti4+, and Nb5+ at the octahedral sites.. |
19. | Koichiro Suekuni, Yuta Shimizu, Eiji Nishibori, Hidetaka Kasai, Hikaru Saito, Daichi Yoshimoto, Katsuaki Hashikuni, Yohan Bouyrie, Raju Chetty, Michihiro Ohta, Emmanuel Guilmeau, Toshiro Takabatake, Kosuke Watanabe, Michitaka Ohtaki, Atomic-scale phonon scatterers in thermoelectric colusites with a tetrahedral framework structure, Journal of Materials Chemistry A, 10.1039/c8ta08248k, 7, 1, 228-235, 2019.01, [URL], Copper-based chalcogenides with tetrahedral framework structures have been attracting increasing attention as environmentally friendly thermoelectric materials. A representative group of such thermoelectric chalcogenides is the Cu 26 A 2 M 6 S 32 (A = V, Nb, Ta; M = Ge, Sn) family of colusites, which exhibit low electrical resistivity, a large Seebeck coefficient, and low thermal conductivity; these properties are necessary for efficient thermal-to-electronic energy conversion. Here, we show the impact of crystal structure on the lattice thermal conductivity of colusite with A = Nb, M = Sn. The crystal structure can be modified by controlling the cationic compositions and the deficiency in the sulfur content as Cu 26-x Nb 2 Sn 6+x S 32-δ . The Cu/Sn ratio is found to be the key parameter for exsolution into distinct phases with ordered and disordered arrangements of cations. For the ordered-structure phase, sulfur sublimation induces atomic-scale defects/disordered states including interstitial defects, anti-site defects, and site splitting, which function as strong phonon scatterers, and the lowest lattice thermal conductivity of ∼0.5 W K -1 m -1 is achieved for the modified ordered structure. This finding provides a simple approach to modifying the crystal structure of thermoelectric chalcogenides via the loss of anions to reduce their lattice thermal conductivity.. |
20. | Katsuaki Hashikuni, Koichiro Suekuni, Hidetomo Usui, Raju Chetty, Michihiro Ohta, Kazuhiko Kuroki, Toshiro Takabatake, Kosuke Watanabe, Michitaka Ohtaki, Thermoelectric Properties and Electronic Structures of CuTi2S4 Thiospinel and Its Derivatives: Structural Design for Spinel-Related Thermoelectric Materials, Inorganic Chemistry, 10.1021/acs.inorgchem.8b02955, 58, 2, 1425-1432, 2019.01, [URL], We report the preparations, thermoelectric and magnetic properties, and electronic structures of Cu-Ti-S systems, namely, cubic thiospinel c-Cu1-xTi2S4 (x ≤ 0.375), a derivative cubic and Ti-rich phase c-Cu1-xTi2.25S4 (x = 0.5, 0.625), and a rhombohedral phase r-CuTi2S4. All samples have the target compositions except for r-CuTi2S4, whose actual composition is Cu1.14Ti1.80S4. All of the phases have n-type metallic character and exhibit Pauli paramagnetism, as proven by experiments and first-principles calculations. The Cu and Ti deficiencies in c-Cu1-xTi2S4 and r-CuTi2S4, respectively, decrease the electron-carrier concentration, whereas the "excess" of Ti ions in c-Cu1-xTi2.25S4 largely increases it. For r-CuTi2S4, the reduced carrier concentration increases the electrical resistivity and Seebeck coefficient, leading to the highest thermoelectric power factor of 0.5 mW K-2m-1 at 670 K. For all of the Cu-Ti-S phases, the thermal conductivity at 670 K is 3.5-5 W K-1m-1, where the lattice part of the conductivity is as low as 1 W K-1m-1at 670 K. As a result, r-CuTi2S4 shows the highest dimensionless thermoelectric figure of merit ZT of 0.2. The present systematic study on the Cu-Ti-S systems provides insights into the structural design of thermoelectric materials based on Cu-M-S (M = transition-metal elements).. |
21. | Yulia Eka Putri, Suhana Mohd Said, Refinel Refinel, Michitaka Ohtaki, Syskri Syukri, Low Thermal Conductivity of RE-Doped SrO(SrTiO3)1 Ruddlesden Popper Phase Bulk Materials Prepared by Molten Salt Method, Electronic Materials Letters, 10.1007/s13391-018-0062-x, 1-7, 2018.04. |
22. | Katsuaki Hashikuni, Koichiro Suekuni, Kosuke Watanabe, Yohan Bouyrie, Michihiro Ohta, Michitaka Ohtaki, ToshiroTakabatake, Carrier Concentration Tuning in Thermoelectric Thiospinel Cu2CoTi3S8 by Oxidative Extraction of Copper, Journal of Solid State Chemistry, 10.1016/j.jssc.2017.12.031, 259, 5-10, 2018.03. |
23. | Kohei Mizuta, Michitaka Ohtaki, Crystal Structure and Thermoelectric Properties of β-Pyrochlore-Type Alkali Iron Tungsten Oxides with Cage-Like Structure, Journal of Electronic Materials, 10.1007/s11664-015-4179-5, 45, 3, 1695-1699, 2016.03. |
24. | Michitaka Ohtaki, Nanostructured oxide thermoelectric materials with enhanced phonon scattering, Oxide Thin Films, Multilayers, and Nanocomposites, 10.1007/978-3-319-14478-8_7, 107-122, 2015.01, [URL], Rapid progress in thermoelectric performance of oxide materials has been conducted virtually exclusively in Japan, resulting in more than ten times increase in the ZT values of oxides within the last two decades. This has caused a revolutionary change in the guiding principles of thermoelectric materials research, in which oxide materials had been disregarded as a potential candidate until early 1990s. Promising oxide thermoelectric materials having been discovered include CaMnO 3 -based perovskites, Al-doped ZnO, layered cobalt oxides represented by NaCo2O4 and Ca3Co4O9, and SrTiO 3 -related phases. This chapter reviews the current aspects of bulk oxide thermoelectric materials, and some strategies for selective reduction of the lattice thermal conductivity (selective phonon scattering) in bulk oxides are also discussed.. |
25. | Li Han, Ngo Van Nong, Wei Zhan, Le Thanh Hung, Tim Holgate, Kazunari Tashiro, Michitaka Ohtaki, Nini Pryds, Søren Linderoth, Effects of morphology on the thermoelectric properties of Al-doped ZnO, RSC Advances, 4, 24, 12353-12361, 2014.02. |
26. | Tohru Sugahara, Michitaka Ohtaki, Katsuaki Suganuma, La doped effects on structure and thermoelectric properties of Sr2MnMoO6 double-perovskite oxides, Journal of Asian Ceramic Societies, 1, 3, 282-288, 2013.09. |
27. | Michitaka Ohtaki, So Miyaishi, Extremely Low Thermal Conductivity in Oxides with Cage-like Crystal Structure , Journal of Electronic Materials, 10.1007/s11664-012-2382-1, 42, 2013.06. |
28. | Li Han, Ngo Van Nong, Le Thanh Hung, Nini Pryds, Michitaka Ohtaki, Søren Linderoth, The Influence of α- and γ-Al2O3 Phases on the Thermoelectric Properties of Al-doped ZnO , Journal of Alloys and Compounds, 555, 291-296, 2013.04. |
29. | Nguyen Viet Long, Michitaka Ohtaki, Masayoshi Yuasa, Satoshi Yoshida, Taiga Kuragaki, Gao Minh Thi, Masayuki Nogami, Synthesis and Self-Assembly of Gold Nanoparticles by Chemically Modified Polyol Methods under Experimental Control, Journal of Nanomaterials, 2013, 793125, 2013.04. |
30. | Nguyen Viet Long, Masayuki Nogami, Cao Minh Thi, Michitaka Ohtaki, Experimental Evidences of Crystal Nucleation and Growth of Platinum Nanoparticles with Most Characteristic Roughness Heteromorphologies and Nanostructures from Homogeneous Solution, Journal of Advanced Microscopy Research, 7, 1-20, 2012.09. |
31. | Tohru Sugahara, Teppei Araki, Michitaka Ohtaki, Katsuaki Suganuma, Structure and Thermoelectric Properties of Double-perovskite Oxides: Sr2-xKxFeMoO6, Journal of the Ceramic Society of Japan, 120, 6, 211-216, 2012.06. |
32. | Nguyen Viet Long, Cao Minh Thi, Masayuki Nogami, Michitaka Ohtaki, Novel Issues of Morphology, Size, and Structure of Pt Nanoparticles in Chemical Engineering: Surface Attachment, Aggregation or Agglomeration, Assembly, and Structural Changes, New Journal of Chemistry, 10.1039/C2NJ40027H, 2012.06. |
33. | Nguyen Viet Long, Michitaka Ohtaki, Takashi Matsubara, Cao Minh Thi, Masayuki Nogami, New Experimental Evidences of Pt-Pd Bimetallic Nanoparticles with Core-Shell Configuration and Highly Fine-ordered Nanostructures by High-Resolution Electron Transmission Microscopy, The Journal of Physical Chemistry C, 116, 22, 12265-12274, 2012.06, In our facile synthesis method, poly(vinylpyrrolidone) protected Pt and Pt-Pd bimetallic nanoparticles with controllable polyhedral core-shell morphologies are precisely synthesized by the reduction of Pt and Pd precursors at a certain temperature in ethylene glycol and silver nitrate as structure-controlling agent. The Pt nanoparticles exhibited well-shaped polyhedral morphology with highly fine and specific nanostructures in the nanosized range of 20 nm. Important evidences of core-shell configurations of the Pt-Pd core-shell nanoparticles were clearly characterized by high-resolution transmission electron microscopy (HRTEM) measurements. The results of HRTEM images showed that the core-shell Pt-Pd nanoparticles in the nanosized range of 25 nm with polyhedral morphology were synthesized with the thin Pd shells of the nanosized range of about 3 nm in thickness as the atomic Pd layers grown on the as-prepared Pt cores in the nanosized range. The very interesting characterization of surface structure of Pt nanostructures and Pt-Pd core-shell nanostructures with surface defects were observed. The high-resolution TEM images of Pt-Pd bimetallic nanoparticles showed that the Frank-van-der Merwe and Stranski-Krastanov growth modes coexist in the nucleation and growth of the Pd shells on the as-prepared Pt cores. The lattice-fringe spacing was estimated as around 0.240 nm, which is assigned exactly to the lattice-fringe spacing of the {111} planes of the Pd metal shell observed. It is predicted that the FM growth becomes a more favorable growth mode compared to the SK growth in the formation of the very thin Pd shells of Pt-Pd core-shell nanoparticles. The experimental evidences of the deformations of lattice fringes and lattice-fringe patterns were found in polyhedral Pt nanoparticles as well as polyhedral Pt-Pd core-shell nanoparticles. The interesting re-nucleation and re-crystallization at their connections or their attachments of the as-prepared nanoparticles are found in a good lattice match. In addition, our novel ideas of the largest surface-area superlattices and suitable utilization of such large surface areas are proposed for next generations of various fuel cells with low cost. Finally, the products of as-prepared Pt-Pd core-shell nanoparticles can potentially utilized as highly efficient catalysts in the realization of polymer electrolyte membrane cell (PEMFC) and direct methanol fuel cell (DMFC) using the very low Pt loading with better cost effective design.. |
34. | Tohru Sugahara, Ngo Van Nong, Michitaka Ohtaki, Structure and Thermoelectric Properties of Ca2-xSrxFeMoO6 (0 ≤ x ≤ 0.3) Double-perovskite Oxides, Materials Chemistry and Physics, 133, 2-3, 630-634, 2012.04. |
35. | Nguyen Viet Long, Nguyen Duc Chien, Tomokatsu Hayakawa, Takashi Matsubara, Michitaka Ohtaki, Masayuki Nogami, Sharp Cubic and Octahedral Morphologies of Poly(vinylpyrrolidone)-stabilised Platinum Nanoparticles by Polyol Method in Ethylene Glycol: Their Nucleation, Growth and Formation Mechanisms, Journal of Experimental Nanoscience, 7, 2, 133-149, 2012.03. |
36. | Michitaka Ohtaki, Kazuhiko Araki, Thermoelectric Properties and Thermopower Enhancement of Al-doped ZnO with Nanosized Pore Structure, Journal of the Ceramic Society of Japan, 119, 11, 813-816, 2011.11. |
37. | Nguyen Viet Long, Michitaka Ohtaki, Tong Duy Hien, Jalem Randy, Masayuki Nogami, A Comparative Study of Pt and Pt-Pd Core-shell Nanocatalysts, Electrochimica Acta, 56, 25, 9133-9143, 2011.10. |
38. | Nguyen Viet Long, Michitaka Ohtaki, Tong Duy Hien, Jalem Randy, Masayuki Nogami, Synthesis and Characterization of Polyhedral and Quasi-sphere Non-polyhedral Pt Nanoparticles: Effects of Their Various Surface Morphologies and Sizes on Electrocatalytic Activity for Fuel Cell Applications, Journal of Nanoparticle Research, 13, 10, 5177-5191, 2011.10. |
39. | Tohru Sugahara, Michitaka Ohtaki, Structural and Semiconductor-to-metal Transitions of Double-perovskite Cobalt Oxide Sr2-xLaxCoTiO6-d with Enhanced Thermoelectric Capability, Applied Physics Letters, 99, 6, 062107, 2011.08. |
40. | Nguyen Viet Long, Michitaka Ohtaki, Masayuki Nogami, Tong Duy Hien, Effects of Heat Treatment and Poly(vinylpyrrolidone) (PVP) Polymer on Electrocatalytic Activity of Polyhedral Pt Nanoparticles towards their Methanol Oxidation, Colloid and Polymer Science, 289, 12, 1373-1386, 2011.08. |
41. | Nguyen Viet Long, Tong Dui Hien, Toru Asaka, Michitaka Ohtaki, Masayuki Nogami, Synthesis and Characterization of Pt-Pd Nanoparticles with Core-shell morphology: Nucleation and Overgrowth of the Pd Shells on the as-prepared and Defined Pt Seeds, Journal of Alloys and Compounds, 509, 29, 7702-7709, 2011.07. |
42. | Nguyen Viet Long, Masaya Uchida, Jalem Randy, Hirohito Hirata, Nguyen Duc Chien, Michitaka Ohtaki, Masayuki Nogami, Synthesis and Characterization of Pt-Pd Alloy and Core-shell Bimetallic Nanoparticles for Direct Methanol Fuel Cells (DMFCs): Enhanced Electrocatalytic Properties of Well-shaped Core-shell morphologies and Nanostructures, International Journal of Hydrogen Energy, 36, 14, 8478-8491, 2011.07. |
43. | Nguyen Viet Long, Michitaka Ohtaki, Masaya Uchida, Randy Jalem, Hirohito Hirata, Nguyen Duc Chien, Masayuki Nogami, Synthesis and Characterization of Polyhedral Pt Nanoparticles: Their Catalytic Property, Surface Attachments, Self-aggregation and Assembly, Journal of Colloid and Interface Science, 359, 2, 339-350, 2011.07. |
44. | Ngo Van Nong, Nini Pryds, Soren Linderoth, Michitaka Ohtaki, Enhancement of the Thermoelectric Performance of p-Type Layered Oxide Ca3Co4O9+d Through Heavy Doping and Metallic Nanoinclusions, Advanced Materials, 23, 21, 2484-2490, 2011.06. |
45. | Ngo Van Nong, Syun-ichi. Yanagiya, Sonne Monica, Nini Pryds, Michitaka Ohtaki, High-Temperature Thermoelectric and Microstructural Characteristics of Cobalt-Based Oxides with Ga Substituted on the Co-Site, Journal of Electronic Materials, 40, 5, 716-722, 2011.05. |
46. | N. V. Nong, C.-J. Liu, M. Ohtaki, High Temperature Thermoelectric Properties of Late Rare Earth-doped Ca3Co4-xGaxO9+d , J. Alloy Compd., 509, 977-981, 2011.01. |
47. | N. V. Nong, C.-J. Liu, M. Ohtaki, Improvement on the High Temperature Thermoelectric Performance of Ga-doped Misfit-layered Ca3Co4-xGaxO9+d (x = 0, 0.05, 0.1, and 0.2), J. Alloy Compd., 491, 1-2, 53-56, 2010.01. |
48. | M. Ohtaki, K. Araki, K. Yamamoto, High Thermoelectric Performance of Dually Doped ZnO Ceramics, Journal of Electronic Materials, 38, 1234-1238, 2009.06. |
49. | T. Sugahara, M. Ohtaki, T. Souma, Thermoelectric Properties of Double-perovskite Oxide Sr2-xMxFeMoO6 (M = Ba, La), J. Ceram. Soc. Jpn., 116 (12), 1278-1282, 2008.12. |
50. | T. Souma, D. Isobe, M. Ohtaki, Synthesis and Rietveld Analysis of New Thermoelectric Oxides F-doped Na1.6Co2O4, Trans. Mater. Res. Soc. Jpn., 33 (4), 897-901, 2008.06. |
51. | M. Ohtaki, R. Hayashi, K. Araki, Thermoelectric Properties of Sintered ZnO Incorporating Nanovid Structure: Influence of the Size and Number Density of Nanovoids, Proc. 26th Int. Conf. Thermoelectrics, pp. 112-116, 2008.04. |
52. | T. Souma, M. Ohtaki, K. Ohnishi, M. Shigeno , Y. Ohba, N. Nakamura, T. Shimozaki, Power Generation Characteristics of Oxide Thermoelectric Modules Incorporating Nanostructured ZnO Sintered Materials, Proc. 26th Int. Conf. Thermoelectrics, pp. 38-41, 2008.04. |
53. | T. Souma, M. Ohtaki, M. Shigeno, Y. Ohba, N. Nakamura, T. Shimozaki, Jointing Technique and Power Generation Characteristics of p-NaCo2O4/n-ZnO Oxide Thermoelectric Modules, Trans. Mater. Res. Soc. Jpn., 32(3), 701-704, 2007.06. |
54. | M. Ohtaki, R. Hayashi, Enhanced Thermoelectric Performance of Nanostructured ZnO: A possibility of Selective Phonon Scattering and Carrier Energy Filtering by Nanovoid Structure, Proc. 25th Int. Conf. Thermoelectrics, pp.276-279., 2006.11. |
55. | T. Souma, M. Ohtaki, M. Shigeno, Y. Ohba, N. Nakamura, T. Shimozaki, Fabrication and Power Generation Characteristics of p-NaCo2O4/n-ZnO Oxide Thermoelectric Modules, Proc. 25th Int. Conf. Thermoelectrics, pp.603-606., 2006.11. |
56. | Ngo Van Nong, Michitaka Ohtaki, Power factors of late rare earth-doped Ca3Co2O6 oxides, Solid State Communications, 10.1016/j.ssc.2006.05.033, 139, 5, 232-234, 2006.08, [URL], Polycrystalline samples of (Ca1-xRx)3Co2O6 with R = Gd, Tb, Dy and Ho at x = 0 - 0.1 were synthesized and the effects of rare earth substitution on their thermoelectric properties were investigated. In the high-temperature region, the rare earth substitution resulted in an increase in the Seebeck coefficients (S), and the S values increased with decreasing ionic radius of rare earth elements in the order Gd3+>Tb3+>Dy3+>Ho3+ . In contrast, the influence of rare earth substitution on the electrical resistivity was small. The high-temperature power factor was thereby improved by the late rare earth substitutions, particularly those with Ho3+ for Ca2+. For the Ho-doped samples (x ≤ 0.05), the power factor was significantly improved by increasing Ho concentration.. |
57. | N. V. Nong, M. Ohtaki, High-temperature Thermoelectric properties of Late Rare Earth-doped Ca3Co2O6, Trans. Mater. Res. Soc. Jpn., 31(2), 399-402, 2006.06. |
58. | H. Hirobe, M. Ohtaki, Enhanced Phonon Scattering by Oxygen Defects in Metal Oxides, Trans. Mater. Res. Soc. Jpn., 31(2), 403-406., 2006.06. |
59. | Takeshi Souma, Michitaka Ohtaki, Synthesis and Rietveld analysis of Zn4 - XCdxSb 3 bulk crystals in the Zn-rich region, Journal of Alloys and Compounds, 10.1016/j.jallcom.2005.06.062, 413, 1-2, 289-297, 2006.03, [URL], A series of nine bulk crystals of the Zn4 - xCd xSb3 compounds (x = 0-2.00 with 0.25 step) has been successfully synthesized and the detailed crystal structure has been refined by powder XRD study using the Rietveld method including the quantitative analysis. The substitution limit of the Cd atoms for the Zn4 - xCd xSb3 system has been extended to x = 2.00 by employing the vacuum casting method without annealing. The purities and densities of the bulk crystals exceeded approximately 96 mass% and 95% of XRD density, respectively. The lattice parameters of the a and c-axes in the system increase linearly with increasing Cd content x with obeying the Vegard law.. |
主要総説, 論評, 解説, 書評, 報告書等
主要学会発表等
学会活動
所属学会名
日本化学会
日本セラミックス協会
日本熱電学会
電気化学会
The American Ceramic Society
International Thermoelectric Society
学協会役員等への就任
2023.04~2025.03, 日本セラミックス協会九州支部, 会長.
2022.07~2024.06, 日本熱電学会, 会長.
2022.03~2024.03, 電気化学会, 代議員(九州支部推薦).
2021.04~2023.03, 日本セラミックス協会九州支部, 副支部長.
2018.07~2022.06, 日本熱電学会, 副会長.
2004.04, 日本熱電学会, 理事.
2014.04, 電気化学会九州支部, 幹事常議員.
2014.07~2018.06, 日本熱電学会, 運営委員.
2008.04~2022.04, 日本セラミックス協会九州支部, 幹事常議員.
2008.04~2014.03, 日本セラミックス協会, 運営委員.
2017.04~2025.03, 日本セラミックス協会 分野横断型研究体「革新的熱利用・熱制御材料研究体」, 代表世話人.
2000.04, 日本セラミックス協会, 生体関連材料部会 役員.
2012.07~2014.06, 日本熱電学会, 運営委員.
2002.02~2003.02, 日本化学会, 九州支部庶務幹事.
2000.04~2001.03, 日本化学会, 九州支部代議員.
2002.04~2003.03, 日本化学会, 九州支部代議員.
1999.04~2001.03, 電気化学会, 九州支部庶務幹事.
学会大会・会議・シンポジウム等における役割
2023.01.22~2023.01.27, The 47th International Conference and Expo on Advanced Ceramics and Composites (ICACC2023), Symposium Lead Organizer.
2022.09.14~2022.09.16, 日本セラミックス協会第35回秋季シンポジウム, 特定セッション25「熱エネルギーの利用と制御における材料革新Ⅲ〜熱エネルギー変換・熱制御・蓄熱・超伝熱・超断熱材料の新展開〜」代表オーガナイザ.
2022.01.23~2022.01.28, The 46th International Conference and Expo on Advanced Ceramics and Composites (ICACC2022), Symposium Lead Organizer.
2021.12.12~2021.12.17, The 14th Pacific Rim Conference of Ceramic Societies (PacRim14), Symposium Lead Organizer.
2021.09.01~2021.09.03, 日本セラミックス協会第34回秋季シンポジウム, 特定セッション25「熱エネルギーの利用と制御における材料革新Ⅱ〜熱エネルギー変換・熱制御・蓄熱・超伝熱・超断熱材料の新展開〜」代表オーガナイザ.
2021.01.31~2021.02.04, The 45th International Conference and Expo on Advanced Ceramics and Composites (ICACC2021), Symposium Lead Organizer.
2020.09.02~2020.09.04, 日本セラミックス協会第33回秋季シンポジウム, 特定セッション10「エネルギー変換・貯蔵・輸送セラミックス材料の基礎と応用」セッション・オーガナイザ.
2020.01.26~2020.01.31, The 44th International Conference and Expo on Advanced Ceramics and Composites (ICACC2020), Symposium Organizer.
2019.10.27~2019.10.31, The 13th Pacific Rim Conference of Ceramic Societies (PacRim13), Symposium Lead Organizer.
2018.09.05~2018.09.07, 日本セラミックス協会第31回秋季シンポジウム, 特定セッション02「熱エネルギーの利用と制御における材料革新〜熱エネルギー変換・伝熱・遮熱・蓄熱・熱制御材料の新展開〜」代表オーガナイザ.
2018.08.20~2018.08.23, Materials Challenges in Alternative and Renewable Energy (MCARE) 2018, Conference Co-organizer.
2018.07.22~2018.07.27, The 12th International Conference on Ceramic Materials and Components for Energy and Environmental Applications (CMCEE 2018), Symposium Lead Organizer.
2017.11.22~2017.11.24, The 34th International Japan-Korea Seminar on Ceramics, 組織委員.
2017.11.14~2017.11.16, 第58回電池討論会, 実行委員.
2017.09.13~2017.09.13, 第14回日本熱電学会学術講演会(TSJ2017)公募シンポジウム「固体材料における熱伝導制御の学術フロンティア」, 代表オーガナイザ.
2017.09.10~2017.09.11, 2017年電気化学秋季大会, 実行委員.
2017.08.27~2017.09.01, The 15th IUMRS International Conference on Advanced Materials (IUMRS-ICA2017), Symposium Organizer.
2017.05.21~2017.05.26, The 12th Pacific Rim Conference on Ceramic and Glass Technology (PacRim12), Symposium Organizer.
2017.02.17~2017.02.20, The 18th International Symposium on Eco-materials Processing and Design (ISEPD2017), 実行委員.
2016.08.26~2016.08.27, 第6回九州若手セラミックフォーラム(KYCF-6) &第46回窯業基礎九州懇話会, 実行委員長.
2016.01.19~2016.01.20, International Conference on Organic and Hybrid Thermoelectrics (ICOT2016), 組織委員.
2015.09.07~2015.09.08, 日本熱電学会第12回学術講演会(TSJ2015), 実行委員長.
2015.06.14~2015.06.19, The 11th International Conference on Ceramic Materials and Components for Energy and Environmental Applications (CMCEE-11), Symposium Lead Organizer.
2015.02.05~2015.02.06, The First Joint Symposium of Kyushu University and Yonsei University on Materials Science and Chemical Engineering (SKY-1) , 座長(Chairmanship).
2014.12.14~2014.12.18, The 13th Eurasia Conference on Chemical Sciences (EuAsC2S-13), 座長(Chairmanship).
2014.11.17~2014.11.19, The Second International Workshop on Nano Materials for Energy Conversion (NMEC-2), 座長(Chairmanship).
2014.08.24~2014.08.29, IUMRS International Conference in Asia (IUMRS-ICA) 2014, 座長(Chairmanship).
2015.02.05~2015.02.06, The First Joint Symposium of Kyushu University and Yonsei University on Materials Science and Chemical Engineering (SKY-1) , Organizer.
2014.12.14~2014.12.18, The 13th Eurasia Conference on Chemical Sciences (EuAsC2S-13), International Advisory Board.
2014.09.09~2014.09.11, 日本セラミックス協会第27回秋季シンポジウム, 実行委員.
2014.08.24~2014.08.29, IUMRS-ICA2014, セッション・オーガナイザ.
2008.12.09~2008.12.14, IUMRS-ICA2008, セッション・オーガナイザ.
2008.09.17~2008.09.19, 日本セラミックス協会第21回秋季シンポジウム, 実行委員.
2008.05.07~2008.05.09, ナノ学会第6回大会, 実行委員.
2007.11~2007.11, 第48回電池討論会, 実行委員.
2005.12~2005.12, 第16回日本MRS学術シンポジウム, セッションオーガナイザ.
2004.12~2004.12, 第15回日本MRS学術シンポジウム, セッションオーガナイザ.
2003.10~2003.10, IUMRS-ICAM2003 Symposium C-6: "Advanced Thermoelectric Materials for Environment-Friendly Energy Systems", Correspondence Chairman.
2002.11~2002.11, 第43回電池討論会, 実行委員.
学会誌・雑誌・著書の編集への参加状況
2010.04~2013.03, 日本セラミックス協会学術論文誌(Journal of Ceramic Society of Japan), 国内, 編集委員.
2004.04~2008.03, 日本熱電学会学術論文誌(Journal of Thermoelectrics Society of Japan), 国内, 編集委員.
2000.04~2003.03, 日本セラミックス協会学術論文誌(Journal of Ceramic Society of Japan), 国内, 編集委員.
学術論文等の審査
年度 | 外国語雑誌査読論文数 | 日本語雑誌査読論文数 | 国際会議録査読論文数 | 国内会議録査読論文数 | 合計 |
---|---|---|---|---|---|
2014年度 | 7 | 0 | 0 | 0 | 7 |
2013年度 | 8 | 0 | 0 | 0 | 8 |
2012年度 | 5 | 0 | 0 | 0 | 5 |
2011年度 | 6 | 0 | 0 | 0 | 6 |
2010年度 | 15 | 0 | 0 | 0 | 15 |
2009年度 | 12 | 3 | 0 | 0 | 15 |
2008年度 | 8 | 0 | 0 | 0 | 8 |
2007年度 | 10 | 0 | 5 | 0 | 15 |
2006年度 | 15 | 4 | 0 | 0 | 19 |
2005年度 | 5 | 4 | 0 | 0 | 9 |
2004年度 | 6 | 0 | 0 | 0 | 6 |
2003年度 | 9 | 0 | 40 | 0 | 49 |
その他の研究活動
外国人研究者等の受入れ状況
2016.06~2016.08, 1ヶ月以上, Mahidol University, Thailand, 外国政府・外国研究機関・国際機関.
2010.11~2013.03, 1ヶ月以上, 九州大学, Vietnam, 文部科学省.
2006.10~2008.03, 1ヶ月以上, 九州大学, Vietnam, 科学技術振興事業団.
受賞
2023 Global Star Award, The American Ceramic Society, 2023.01.
日本セラミックス協会 第74回学術賞, 公益社団法人 日本セラミックス協会, 2019.11.
日本熱電学会学術賞, 一般社団法人日本熱電学会, 2018.09.
研究資金
科学研究費補助金の採択状況(文部科学省、日本学術振興会)
2023年度~2025年度, 挑戦的研究(萌芽), 代表, 共ドープによる固溶元素の安定化効果に基づく熱力学的に安定なバルクp型ZnOの創製.
2022年度~2024年度, 基盤研究(B), 代表, 導電性ナノ粒子によりフォノン散乱と導電性を同時に増強した酸化物熱電材料の開発.
2019年度~2021年度, 基盤研究(B), 代表, 酸化物/窒化物へテロ界面を持つバルクナノコンポジット熱電変換材料の開発.
2016年度~2018年度, 挑戦的萌芽研究, 代表, 構造-電子相転移の併発による動的サーマルインシュレーション材料の開発.
2014年度~2016年度, 基盤研究(B), 代表, バルクナノへテロ構造を有する酸化物熱電変換材料の開発.
2013年度~2015年度, 挑戦的萌芽研究, 代表, 結晶構造中にかご状空間を有する「ラトリング」酸化物熱電材料の開発.
2008年度~2009年度, 萌芽研究, 代表, ナノサイズ領域の独立閉気孔構造によるフォノン熱伝導の特異的低減.
2008年度~2009年度, 萌芽研究, 代表, ナノサイズ領域の独立閉気孔構造によるフォノン熱伝導の特異的低減.
2006年度~2008年度, 基盤研究(B), 代表, 金属酸化物の熱電物性における酸素イオン副格子の構造とダイナミクス.
2004年度~2005年度, 萌芽研究, 代表, 精緻な階層的ナノ構造を持つ酸化物半導体超構造の合成と物性.
2001年度~2003年度, 基盤研究(C), 代表, 導電性酸化物における高エントロピー伝導と熱電変換材料への応用.
1999年度~2000年度, 奨励研究(A), 代表, 二分子膜−酸化物層状複合体の低温結晶化による二次元量子閉じ込め構造半導体の創製.
1997年度~1998年度, 奨励研究(A), 代表, 分子集合体テンプレートの可溶化機能を利用した量子サイズ酸化物複合体の創製.
1997年度~1997年度, 重点領域研究, 代表, 2相から成る高速酸素イオン導電性固体電解質の合成と評価.
1996年度~1996年度, 奨励研究(A), 代表, 分子集合体を鋳型とした量子ヘテロ構造半導体の合成.
1995年度~1995年度, 奨励研究(A), 代表, 金属酸化物半導体へのアニオンドーピング.
1994年度~1994年度, 奨励研究(A), 代表, 常温液相プロセスを利用した金属および半導体超微粒子の精密合成.
1993年度~1993年度, 奨励研究(A), 代表, 無機超微粒子と有機分子を複合分散したミクロ多孔質半導体材料の合成と光機能化.
競争的資金(受託研究を含む)の採択状況
2020年度~2022年度, 戦略的創造研究推進事業 (文部科学省), 連携, 微小エネルギーを利用した革新的な環境発電技術の創出
「低熱伝導率材料を用いた熱電モジュールの開発」.
「低熱伝導率材料を用いた熱電モジュールの開発」.
2017年度~2017年度, NEDO未利用熱エネルギーの革新的活用技術研究開発/熱電変換材料の技術シーズ発掘小規模研究開発, 分担, 溶射法を利用した熱電変換モジュールの研究開発.
2011年度~2014年度, Danish Council for Independent Research, Technology and Production, 分担, OTE-POWER – Oxide thermoelectrics for effective power generation from waste heat.
2009年度~2011年度, 文部科学省 知的創造による地域産学官連携強化プログラム「知的クラスター創成事業」, 分担, 超高効率化を実現するナノ構造熱電発電モジュールの開発.
2008年度~2012年度, 研究拠点形成費補助金(グローバルCOE) (文部科学省), 分担, 新炭素資源学.
2008年度~2008年度, 科学技術振興機構 地域イノベーション創出総合支援事業 重点地域研究開発推進プログラム「シーズ発掘試験」, 代表, 多元ドープによるバルクナノコンポジット構造ZnO系酸化物熱電材料の開発.
2002年度~2007年度, 科学技術振興機構 戦略的創造研究推進事業(CREST), 分担, ナノブロックインテグレーションによる層状酸化物熱電材料の創製.
2006年度~2006年度, 科学技術振興機構 地域イノベーション創出総合支援事業 重点地域研究開発推進プログラム「シーズ発掘試験」, 代表, セラミックハニカムを用いた高密度実装酸化物熱電発電モジュールの開発.
2002年度~2005年度, 科学技術振興機構 重点地域研究開発促進事業, 代表, 500℃級排熱回収用熱電発電素子の開発.
共同研究、受託研究(競争的資金を除く)の受入状況
2018.04~2018.11, 代表, 熱制御材料の開発.
2017.04~2018.03, 代表, 熱制御材料の開発.
2016.04~2017.03, 代表, 熱制御材料の開発.
2015.04~2016.03, 代表, 熱制御材料の開発.
2011.04~2012.03, 代表, 高効率酸化物熱電変換材料に関する研究.
2010.05~2011.03, 代表, 高効率酸化物熱電変換材料に関する研究.
2010.01~2010.09, 代表, 高性能熱電変換材料の開発.
寄附金の受入状況
2018年度, 公益財団法人大倉和親記念財団, 公益財団法人大倉和親記念財団 2018年度第49回研究助成金/窒化物シェルを拡散防止層とする超耐熱性ナノコンポジット酸化物熱電変換材料の開発.
2009年度, 昭和電線ケーブルシステム株式会社, 奨学寄付金.
2009年度, TOTO株式会社, 奨学寄付金.
2009年度, 日揮触媒化成株式会社, 奨学寄付金.
2010年度, 日揮触媒化成株式会社, 奨学寄付金.
学内資金・基金等への採択状況
2002年度~2003年度, 九州大学教育研究プログラム・研究拠点形成プロジェクト(P&P)(B-2タイプ), 代表, 階層的ナノ構造の時空間制御による無機ナノフォトニクス材料の創製.
2002年度~2003年度, 九州大学教育研究プログラム・研究拠点形成プロジェクト(P&P)(Cタイプ), 分担, 次世代のソフトエネルギーに関する最先端教育プログラムの構築.
2002年度~2004年度, 九州大学教育研究プログラム・研究拠点形成プロジェクト(P&P)(Aタイプ), 分担, 次世代化学機能デバイスの基盤技術としてのセラミックスウェットプロセッシング −ナノレベルからの構造と機能の制御−.
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九大関連コンテンツ
QIR 九州大学学術情報リポジトリ システム情報科学研究院
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