Updated on 2025/04/30

Information

 

写真a

 
HASHIKUNI KATSUAKI
 
Organization
Faculty of Engineering Department of Mechanical Engineering Assistant Professor
Graduate School of Engineering Department of Hydrogen Energy Systems（Concurrent）
Title
Assistant Professor
Contact information
メールアドレス
Homepage
External link

Research Areas

  • Nanotechnology/Materials / Inorganic materials and properties

Degree

  • Doctor of Science （ 2021.3 Kyushu University ）

Research History

  • Kyushu University Faculty of Engineering Assistant Professor 

    2024.4 - Present

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  • Sanyo-Onoda City University Faculty of Engineering Department of Electrical Engineering Assistant Professor 

    2021.4 - 2024.3

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    Country：Japan

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  • 2019.4-2021.3 日本学術振興会特別研究員 (DC2)   

    2019.4-2021.3 日本学術振興会特別研究員 (DC2)

  • 2021.4-2024.3 山陽小野田市立山口東京理科大学工学部 助教   

Education

  • Kyushu University   総合理工学府   量子プロセス理工学専攻

    2018.4 - 2021.3

  • Hiroshima University   先端物質科学研究科   量子物質科学専攻

    2016.4 - 2018.3

  • Hiroshima University   理学部   物理科学科

    2012.4 - 2016.3

Research Interests・Research Keywords

  • Research theme： thermoelectrics

    Keyword： thermoelectrics

    Research period： 2024

  • Research theme： Thermoelectric

    Keyword： thermoelectric properties, sulfide, thiospinel, skutterudite

    Research period： 2015.4 - 2024.4

Awards

  • 優秀講演賞

    2016.9   日本熱電学会   「N型チオスピネルCu2MTi3S8 (M = Mn, Fe, Co, Ni)の熱電物性と電子構造」， 第13回日本熱電学会学術講演会，東京

  • The ITS Outstanding Poster Award

    2016.6   International Thermoelectric Society   "Cu2MTi3S8 (M = Mn, Fe, Co, Ni) thiospinels: environmentally benign n-type thermoelectric materials", The 35th International Conference & The 1st Asian Conference on Thermoelectrics, Wuhan (China).

Papers

  • A comparative study of thermoelectric Cu2TrTi3S8 (Tr = Co and Sc) thiospinels: Enhanced Seebeck coefficient via electronic structure modification Reviewed International journal

    Katsuaki Hashikuni, Koichiro Suekuni, Hidetomo Usui, Raju Chetty, Michihiro Ohta, Toshiro Takabatake, and Michitaka Ohtaki

    Journal of Alloys and Compounds   871   159548   2021.3

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

    DOI： https://doi.org/10.1016/j.jallcom.2021.159548

    Repository Public URL： https://hdl.handle.net/2324/7347402

  • Thermoelectric Properties and Electronic Structures of CuTi2S4 Thiospinel and Its Derivatives: Structural Design for Spinel-Related Thermoelectric Materials Reviewed International journal

    Katsuaki Hashikuni, Koichiro Suekuni, Hidetomo Usui, Raju Chetty, Michihiro Ohta, Kazuhiko Kuroki, Toshiro Takabatake

    Inorganic Chemistry   58 ( 2 )   1425 - 1432   2019.1

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

    DOI： https://doi.org/10.1021/acs.inorgchem.8b02955

    Repository Public URL： https://hdl.handle.net/2324/7347404

  • Carrier concentration tuning in thermoelectric thiospinel Cu2CoTi3S8 by oxidative extraction of copper Reviewed International journal

    Katsuaki Hashikuni, Koichiro Suekuni, Kosuke Watanabe, Yohan Bouyrie, Michihiro Ohta, Michitaka Ohtaki, Toshiro Takabatake

    Journal of Solid State Chemistry   259   5 - 10   2017.12

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

    DOI： https://doi.org/10.1016/j.jssc.2017.12.031

    Repository Public URL： https://hdl.handle.net/2324/7347408

  • High power factor in thiospinels Cu2TrTi3S8 (Tr = Mn, Fe, Co, Ni) arising from TiS6 octahedron network Reviewed International journal

    Katsuaki Hashikuni, Koichiro Suekuni, Hidetomo Usui, Michihiro Ohta, Kazuhiko Kuroki, Toshiro Takabatake

    Applied Physics Letters   109 ( 18 )   182110   2016.11

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

    DOI： https://doi.org/10.1063/1.4966955

    Repository Public URL： https://hdl.handle.net/2324/7347426

  • 密度汎関数理論によるGa-P同時ドープBa8Cu6Ge40クラスレートの電子構造の研究 Reviewed

    阿武宏明, 橋國克明

    山陽小野田市立山口東京理科大学紀要   7   21 - 26   2024.3

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    Publishing type：Research paper (bulletin of university, research institution)  

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    Repository Public URL： https://hdl.handle.net/2324/7347441

  • スクッテルダイトCoSb3の電子構造と輸送特性 Reviewed

    阿武宏明，橋國克明

    山陽小野田市立山口東京理科大学紀要   6   23 - 30   2023.4

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    Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

    Repository Public URL： https://hdl.handle.net/2324/7347433

  • An effective synthesis route for high-performance α-MgAgSb thermoelectric material Reviewed

    Keita Toh, Koichiro Suekuni, Katsuaki Hashikuni, Hirotaka Nishiate, Ushin Anazawa, Chul-Ho Lee, Michitaka Ohtaki

    Journal of Materials Science   57 ( 24 )   11265 - 11273   2022.6   （ ISSN:0022-2461 eISSN:1573-4803 ）

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

    α-MgAgSb has been receiving attention as a thermoelectric material due to its high performance at 300–550 K. A MgAgSb sample synthesized by melting the constituent elements is known to contain secondary phases, which can be diminished by long-term heat treatment. However, less effort has been devoted to investigating the secondary phases and exploring an effective synthesis route to improve the sample purity. In this work, we showed that an as-melted sample comprised α-MgAgSb and large amounts of Ag3Sb and Mg4AgSb3. The secondary phases were successfully diminished/reacted through short-term ball milling and sintering processes. Secondary phases were further reduced by decreasing the starting Ag content, leading to the enhanced dimensionless figure of merit ZT of 0.4 at 300 K and 0.7 at 450 K. The synthesis route without long-term heat treatment is expected to contribute to efficient production of α-MgAgSb. Graphical abstract: [Figure not available: see fulltext.]

    DOI： 10.1007/s10853-022-07306-5

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    Other Link： https://link.springer.com/article/10.1007/s10853-022-07306-5/fulltext.html

  • 密度汎関数理論計算によるBa8Cu6Ge40クラスレートの電子構造と輸送特性 Reviewed

    阿武宏明，橋國克明

    山陽小野田市立山口東京理科大学紀要   5   9 - 16   2022.4

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    Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

    Repository Public URL： https://hdl.handle.net/2324/7347437

  • Thermoelectric quaternary sulfide Cu2+xZn1−xSnS4 (x = 0–0.3): Effects of Cu substitution for Zn Reviewed International journal

    Bui Duc Long, Le Hong Thang, Nguyen Hong Hai, Koichiro Suekuni, Katsuaki Hashikuni, Tran Quang Minh Nhat, Wojciech Klich, Michitaka Ohtaki

    Materials Science & Engineering B   272   115353   2021.10

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

    DOI： https://doi.org/10.1016/j.mseb.2021.115353

  • Key Role of d0 and d10 Cations for the Design of Semiconducting Colusites: Large Thermoelectric ZT in Cu26Ti2Sb6S32 Compounds Reviewed International journal

    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

    Chemistry of Materials   33 ( 9 )   3449 - 3456   2021.4

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

    DOI： https://doi.org/10.1021/acs.chemmater.1c00872

  • Electronic structure and thermoelectric properties of Sn1.2−xNbxTi0.8S3 with a quasi-one-dimensional structure Reviewed International journal

    Koichiro Suekuni, Hidetomo Usui, Siying Qiao, Katsuaki Hashikuni, Tatsuya Hirano, Hirotaka Nishiate, Chul-Ho Lee, Kazuhiko Kuroki, Kosuke Watanabe, Michitaka Ohtaki

    Journal of Applied Physics   125   175111   2019.5

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

    DOI： https://doi.org/10.1063/1.5093183

  • Atomic-scale phonon scatterers in thermoelectric colusites with a tetrahedral framework structure Reviewed International journal

    Koishiro 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

    Journal of Materials Chemistry A   7   228 - 235   2018.11

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

    DOI： https://doi.org/10.1039/C8TA08248K

  • Retreat from Stress: Rattling in a Planar Coordination Reviewed International journal

    Koichiro Suekuni, Chul Ho Lee, Hiromi I. Tanaka, Eiji Nishibori, Atsushi Nakamura, Hidetaka Kasai, Hitoshi Mori, Hidetomo Usui, Masayuki Ochi, Takumi Hasegawa, Mitsutaka Nakamura, Seiko Ohira-Kawamura, Tatsuya Kikuchi, Koji Kaneko, Hirotaka Nishiate, Katsuaki Hashikuni, Yasufumi Kosaka, Kazuhiko Kuroki, Toshiro Takabatake

    Advanced Materials   30 ( 13 )   1706230   2018.2

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

    DOI： https://doi.org/10.1002/adma.201706230

  • Effects of Ge and Sb substitution on the metal-semiconductor transition and thermoelectric properties of Cu12Sb4S13 tetrahedrite Reviewed International journal

    Yasufumi Kosaka, Koichiro Suekuni, Katsuaki Hashikuni, Yohan Bouyrie, Michihiro Ohta, Toshiro Takabatake

    Physical Chemistry Chemical Physics   19   8874 - 8879   2016.3

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

    DOI： https://doi.org/10.1039/C7CP00351J

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Presentations

  • Development of a High-Density coating film of CoSb3

    Shimon Ogasawara, Keito Iyo, Kosuke Watanabe, Katsuaki Hashikuni, Koji Miyazaki

    日本機械学会九州支部九州学生会第56回学生員卒業研究発表講演会  2025.3 

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    Event date： 2025.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大分市  

    Repository Public URL： https://hdl.handle.net/2324/7347432

  • Synthesis of the Olivine for Hydrogen Production

    Temma Satake, Katsuaki Hashikuni, Kosuke Watanabe, Koji Miyazaki

    日本機械学会九州支部九州学生会第56回学生員卒業研究発表講演会  2025.3 

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    Event date： 2025.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大分市  

    Repository Public URL： https://hdl.handle.net/2324/7347430

  • Stable Carrier Control of Carbon Nanotubes Using Electric Double Layer Electrets

    Katsuaki Hashikuni, Ryu Inoue, Hiroaki Anno

    40th International & 20th European Conference on Thermoelectrics  2024.7 

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    Event date： 2024.6 - 2024.7

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  • 真空熱処理によるカーボンナノチューブのpn極性変化と熱電特性

    金光倫玖，橋國克明，阿武宏明

    第20回日本熱電学会学術講演会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：北九州   Country：Japan  

  • 電気二重層エレクトレットを利用したカーボンナノチューブのキャリア制御

    井上竜，橋國克明，阿武宏明

    第20回日本熱電学会学術講演会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：北九州   Country：Japan  

  • The influence of preparation conditions on thermoelectric properties of skutterudite-related Co2Ge3S3 International conference

    Katsuaki Hashikuni, Hiroaki Anno

    The 39th Annual International Conference on Thermoelectrics  2023.6 

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    Event date： 2023.6

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Seattle   Country：United States  

  • スクッテルダイト型硫化物Co2Ge3S3の合成条件と熱電特性

    橋國克明，阿武宏明

    第70回応用物理学会春季学術講演会  2023.3 

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    Event date： 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • Ba8Au6−xFexGe40クラスレートの熱電特性

    中谷祐介，橋國克明，阿武宏明

    第70回応用物理学会春季学術講演会  2023.3 

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    Event date： 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • Co2Ge3S3の熱電物性に及ぼす出発原料形状の影響

    橋國克明，阿武宏明

    第19回日本熱電学会学術講演会  2022.8 

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    Event date： 2022.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：長岡   Country：Japan  

  • 密度汎関数理論による2次元遷移金属ダイカルコゲナイドの熱電特性の層厚依存性の研究

    吉田大貴，橋國克明，阿武宏明

    2022年度応用物理・物理系学会中国四国支部合同学術講演会  2022.7 

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    Event date： 2022.7

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：高松   Country：Japan  

  • Thermoelectric properties of two-dimensional titanium disulfide nanosheets studied by density functional theory International conference

    Daiki Yoshida, Katsuaki Hashikuni, Hiroaki Anno

    Virtual Conference on Thermoelectrics 2022  2022.7 

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    Event date： 2022.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Other  

  • Effects of heat treatment on thermoelectric properties of carbon nanotube thin films by spin coating method International conference

    Ryu Inoue, Katsuaki Hashikuni, Hiroaki Anno

    Virtual Conference on Thermoelectrics 2022  2022.7 

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    Event date： 2022.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Other  

  • Thermoelectric properties in composites of germanium and silicon-based clathrate by planetary ball milling International conference

    Hirotaka Ishizu, Katsuaki Hashikuni, Hiroaki Anno

    Virtual Conference on Thermoelectrics 2022  2022.7 

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    Event date： 2022.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Other  

  • Ba8Cu6Ge40クラスレートにおける欠陥の熱電特性へ及ぼす影響

    阿武宏明，橋國克明

    第69回応用物理学会春季学術講演会  2022.3 

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    Event date： 2022.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：相模原   Country：Japan  

  • Thermoelectric Properties of p-type Ba8Au6Ge40 Clathrate International conference

    Yudai Koga, Katsuaki Hashikuni, Hiroaki Anno

    1st Japan-France Virtual Workshop on Thermoelectrics  2021.9 

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    Event date： 2021.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Other  

  • Electronic structure modification for increasing the Seebeck coefficient of Cu2Ti4S8 International conference

    Katsuaki Hashikuni, Koichiro Suekuni, Hidetomo Usui, Raju Chetty, Michihiro Ohta, Toshiro Takabatake, Michitaka Ohtaki

    1st Japan-France Virtual Workshop on Thermoelectrics  2021.9 

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    Event date： 2021.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Other  

  • Thermoelectric properties of carbon nanotubes carrier-tuned by electric double layer techniques International conference

    Haruka Yoshida, Katsuaki Hashikuni, Hiroaki Anno

    1st Japan-France Virtual Workshop on Thermoelectrics  2021.9 

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    Event date： 2021.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Other  

  • p型Ba8CuxGe46−xクラスレートの熱電物性における最適キャリア濃度の推定

    古賀雄大，橋國克明，阿武宏明

    第18回日本熱電学会学術講演会  2021.8 

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    Event date： 2021.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • カーボンナノチューブにおける電気二重層技術による熱電特性の制御と最適化

    吉田はるか，橋國克明，阿武宏明

    第18回日本熱電学会学術講演会  2021.8 

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    Event date： 2021.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 電気二重層技術によりキャリア制御したカーボンナノチューブの熱電特性

    吉田はるか，橋國克明，阿武宏明

    2021年度応用物理・物理系学会中国四国支部合同学術講演会  2021.7 

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    Event date： 2021.7

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • p型Ge系クラスレート半導体における熱電特性Cu組成依存性

    古賀雄大，橋國克明，阿武宏明

    2021年度応用物理・物理系学会中国四国支部合同学術講演会  2021.7 

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    Event date： 2021.7

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • Investigation of synthesis and thermoelectric properties for p-type Ge clathrate by Cu substitution International conference

    Yudai Koga, Katsuaki Hashikuni, Hiroaki Anno

    Virtual Conference on Thermoelectrics 2021  2021.7 

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    Event date： 2021.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Other  

  • 室温熱電材料α-MgAgSbの溶融法による合成条件の検討

    藤啓太，末國晃一郎，橋國克明，穴沢卯進，西当弘隆，李哲虎，大瀧倫卓

    第17回日本熱電学会学術講演会  2020.9 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 新規な高性能熱電銅硫化物Cu26Ti2Sb6−xGexS32

    萩原岳志，末國晃一郎，橋國克明，Chetty Raju，太田道広，大瀧倫卓

    第17回日本熱電学会学術講演会  2020.9 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 硫化スピネルCu2Ti4S8の電子構造制御によるゼーベック係数の増大

    橋國克明，末國晃一郎，臼井秀知，Chetty Raju，太田道広，高畠敏郎，大瀧倫卓

    第17回日本熱電学会学術講演会  2020.9 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 室温熱電材料α-MgAgSbのホットプレスによる焼結体作製条件の検討

    末國晃一郎，藤啓太，橋國克明，穴沢卯進，西当弘隆，李哲虎，大瀧倫卓

    第17回日本熱電学会学術講演会  2020.9 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • n型熱電材料として有望なTi-S系スピネル化合物 Invited

    橋國克明

    日本熱電学会第25回研究会  2020.3 

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    Event date： 2020.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 硫化スピネルCu2FeTi3S8の結晶構造と熱電物性に対するCu欠損効果

    橋國克明，末國晃一郎，Chetty Raju，太田道広，高畠敏郎，大瀧倫卓

    第16回日本熱電学会学術講演会  2019.9 

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    Event date： 2019.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：名古屋   Country：Japan  

  • Rhombohedral CuTi2S4: a thiospinel-derived thermoelectric material International conference

    Katsuaki Hashikuni, Koichiro Suekuni, Hidetomo Usui, Raju Chetty, Michihiro Ohta, Kazuhiko Kuroki, Toshiro Takabatake, Kosuke Watanabe, Michitaka Ohtaki

    The 38th International Conference on Thermoelectrics and The 4th Asian Conference on Thermoelectrics  2019.7 

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    Event date： 2019.6 - 2019.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Gyongju   Country：Korea, Republic of  

  • Cu 2p-1s X線発光分光によるCu12As4S13の金属半導体転移の研究

    松本拓真，前田和大，佐藤仁，末國晃一郎，橋國克明，高畠敏郎，河村直己

    日本物理学会第74回年次大会  2019.3 

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    Event date： 2019.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：福岡   Country：Japan  

  • 硫化スピネルCu2Ti4S8の結晶構造と電子構造および熱電物性に対するCu欠損効果

    橋國克明，末國晃一郎，臼井秀知，Chetty Raju，太田道広，黒木和彦，高畠敏郎

    第15回日本熱電学会学術講演会  2018.9 

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    Event date： 2018.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：仙台   Country：Japan  

  • 熱電硫化銅鉱物コルーサイトの低熱伝導率を実現する結晶構造

    清水裕太，末國晃一郎，吉本大地，西堀英治，笠井秀隆，Bouyrie Yohan，Chetty Raju，太田道広，橋國克明，高畠敏郎，大瀧倫卓

    第15回日本熱電学会学術講演会  2018.9 

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    Event date： 2018.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：仙台   Country：Japan  

  • Thermoelectric Properties of Cu-deficient Thiospinel Cu2−xTi4S8 and the derivative Cu2−xTi4.5S8 International conference

    Katsuaki Hashikuni, Koichiro Suekuni, Hidetomo Usui, Raju Chetty, Michihiro Ohta, Kazuhiko Kuroki, Toshiro Takabatake

    37th Annual International Conference on Thermoelectrics and 16th Annual European Conference on Thermoelectrics  2018.7 

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    Event date： 2018.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Caen   Country：France  

  • Effects of Se substitution on the thermoelectric properties of (SnS)1.2(TiS2)n (n = 1, 2) International conference

    Tatsuya Hirano, Koichiro Suekuni, Katsuaki Hashikuni, Hirotaka Nishiate, Chul-Ho Lee, Toshiro Takabatake, Michitaka Ohtaki

    37th Annual International Conference on Thermoelectrics and 16th Annual European Conference on Thermoelectrics  2018.7 

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    Event date： 2018.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Caen   Country：France  

  • Rattling dynamics under a planar coordination in tetrahedrites International conference

    Chul-Ho Lee, Koichiro Suekuni, Hiromi Tanaka, Eiji Nishibori, Atsushi Nakamura, Hideraka Kasai, Hitoshi Mori, Hidetomo Usui, Masayuki Ochi, Takumi Hasegawa, Mitsutaka Nakamura,Seiko Kawamura, Tatsuya Kikuchi, Koji Kaneko, Hirotaka Nishiate, Katsuaki Hashikuni,Yasufumi Kosaka, Kazuhiko Kuroki, Toshiro Takabatake

    37th Annual International Conference on Thermoelectrics and 16th Annual European Conference on Thermoelectrics  2018.7 

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    Event date： 2018.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Caen   Country：France  

  • 擬一次元物質Sn1.2Ti0.8S3の熱電物性に対するNb置換効果

    喬思瑩，末國晃一郎，平野達也，橋國克明，高畠敏郎，西当弘隆，李哲虎，大瀧倫卓

    第14回日本熱電学会学術講演会  2017.9 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大阪   Country：Japan  

  • Ti–S系物質の構造次元性と熱電物性

    末國晃一郎，臼井秀知，関水準記，橋國克明，喬思瑩，平野達也，黒木和彦，高畠敏郎，大瀧倫卓

    第14回日本熱電学会学術講演会  2017.9 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大阪   Country：Japan  

  • N型チオスピネルCu2CoTi3S8のCuのヨウ素酸化抽出によるキャリア密度制御

    橋國克明，末國晃一郎，渡邊厚介，Bouyrie Yohan，太田道広，大瀧倫卓，高畠敏郎

    第14回日本熱電学会学術講演会  2017.9 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大阪   Country：Japan  

  • ミスフィット層状化合物(SnS)1.2(TiS2)n (n = 1, 2)の熱電物性に対するSe置換効果

    平野達也，末國晃一郎，橋國克明，高畠敏郎，西当弘隆，李哲虎，大瀧倫卓

    第14回日本熱電学会学術講演会  2017.9 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大阪   Country：Japan  

  • Thermoelectric Properties of Ge/Sn Bearing Tetrahedrites International conference

    Koichiro Suekuni, Yasufumi Kosaka, Katsuaki Hashikuni, Yohan Bouyrie, Michihiro Ohta, Toshiro Takabatake

    36th International Conference on Thermoelectrics  2017.8 

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    Event date： 2017.7 - 2017.8

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Pasadena   Country：United States  

  • Carrier Density Tuning in Cu2CoTi3S8 by Oxidative Extraction of Cu International conference

    Katsuaki Hashikuni, Koichiro Suekuni, Kosuke Watanabe, Yohan Bouyrie, Michihiro Ohta, Michitaka Ohtaki, Toshiro Takabatake

    36th International Conference on Thermoelectrics  2017.7 

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    Event date： 2017.7 - 2017.8

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Pasadena   Country：United States  

  • N型チオスピネルCu2MTi3S8 (M = Mn, Fe, Co, Ni)の熱電物性と電子構造

    橋國克明，末國晃一郎，高畠敏郎，西当弘隆，太田道広，臼井秀知，黒木和彦

    第13回日本熱電学会学術講演会  2016.9 

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    Event date： 2016.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • Cu2MTi3S8 (M = Mn, Fe, Co, Ni) thiospinels: environmentally benign n-type thermoelectric materials International conference

    Katsuaki Hashikuni, Koichiro Suekuni, Hirotaka Nishiate, Michihiro Ohta, Toshiro Takabatake

    The 35th International Conference & The 1st Asian Conference on Thermoelectrics  2016.6 

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    Event date： 2016.5 - 2016.6

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Wuhan   Country：China  

  • 電気二重層エレクトレットを利用したカーボンナノチューブのキャリア制御

    井上竜, 橋國克明, 阿武宏明

    第20回日本熱電学会学術講演会  2023.9 

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  • 真空熱処理によるカーボンナノチューブのpn極性変化と熱電特性

    金光倫玖, 橋國克明, 阿武宏明

    第20回日本熱電学会学術講演会  2023.9 

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  • 密度汎関数理論による2次元遷移金属ダイカルコゲナイドの熱電特性の層厚依存性の研究

    吉田大貴, 橋國克明, 阿武宏明

    2022.7 

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  • Effect of difference in particle size due to different synthesis conditions on thermoelectric properties of Co2Ge3S3

    Katsuaki Hashikuni, Hiroaki Anno

    The 8th Phonon Engineering Workshop  2024.5 

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  • スクッテルダイト型硫化物Co2Ge3S3の合成条件と熱電特性

    橋國克明, 阿武宏明

    第70回応用物理学会春季学術講演会  2023.3 

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  • Thermoelectric properties of two-dimensional titanium disulfide nanosheets studied by density functional theory

    Daiki Yoshida, Katsuaki Hashikuni, Hiroaki Anno

    Virtual Conference on Thermoelectrics 2022  2022.7 

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  • Thermoelectric properties in composites of germanium and silicon-based clathrate by planetary ball milling

    Hirotaka Ishizu, Katsuaki Hashikuni, Hiroaki Anno

    Virtual Conference on Thermoelectrics 2022  2022.7 

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  • The influence of preparation conditions on thermoelectric properties of skutterudite-related Co2Ge3S3

    Katsuaki Hashikuni, Hiroaki Anno

    The 39th Annual International Conference on Thermoelectrics  2023.6 

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  • Effects of heat treatment on thermoelectric properties of carbon nanotube thin films by spin coating method

    Ryu Inoue, Katsuaki Hashikuni, Hiroaki Anno

    Virtual Conference on Thermoelectrics 2022  2022.7 

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  • Co2Ge3S3の熱電物性に及ぼす出発原料形状の影響

    橋國克明, 阿武宏明

    第19回日本熱電学会学術講演会  2022.8 

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  • Ba8Cu6Ge40クラスレートにおける欠陥の熱電特性へ及ぼす影響

    阿武宏明, 橋國克明

    第69回応用物理学会春季学術講演会  2022.3 

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  • Ba8Au6−xFexGe40クラスレートの熱電特性

    中谷祐介, 橋國克明, 阿武宏明

    第70回応用物理学会春季学術講演会  2023.3 

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Professional Memberships

  • The Heat Transfer Society of Japan

    2024.8 - Present

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  • The Japan Society of Applied Physics

    2020.1 - Present

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  • The Physical Society of Japan

    2019.2 - Present

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  • Thermoelectrics Society of Japan

    2016.5 - Present

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  • Thermoelectrics Society of Japan

  • The Physical Society of Japan

  • The Japan Society of Applied Physics

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Committee Memberships

  • 一般社団法人日本熱電学会   講演会委員   Domestic

    2024.12 - Present   

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    Committee type：Academic society

Research Projects

  • スクッテルダイト型硫化物の局所構造と熱電特製の関係の解明

    2023.4 - 2026.3

    科学研究費助成事業 若手研究 

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    Authorship：Principal investigator 

  • 硫化スピネル化合物をベースにした高性能な熱電変換物質の創製

    2019.4 - 2021.3

    科学研究費助成事業 特別研究員奨励費 

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    Authorship：Principal investigator 

Class subject

  • 機械工学実験第一

    2024.4 - Present   First semester