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ID 60624
フルテキストURL
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著者
Myint, May Thu Zar Graduate School of Natural Science and Technology, Okayama University
Nishikawa, Takeshi Graduate School of Natural Science and Technology, Okayama University Kaken ID publons researchmap
Omoto, Kazuki Graduate School of Natural Science and Technology, Okayama University
Inoue, Hirotaka Graduate School of Natural Science and Technology, Okayama University
Yamashita, Yoshifumi Graduate School of Natural Science and Technology, Okayama University Kaken ID publons researchmap
Kyaw, Aung Ko Ko Department of Electrical and Electronic Engineering, Southern University of Science and Technology
Hayashi, Yasuhiko Graduate School of Natural Science and Technology, Okayama University ORCID Kaken ID researchmap
抄録
Flexible, light-weight and robust thermoelectric (TE) materials have attracted much attention to convert waste heat from low-grade heat sources, such as human body, to electricity. Carbon nanotube (CNT) yarn is one of the potential TE materials owing to its narrow band-gap energy, high charge carrier mobility, and excellent mechanical property, which is conducive for flexible and wearable devices. Herein, we propose a way to improve the power factor of CNT yarns fabricated from few-walled carbon nanotubes (FWCNTs) by two-step method; Joule-annealing in the vacuum followed by doping with p-type dopants, 2,3,5,6-tetrafluo-7,7,8,8-tetracyanoquinodimethane (F4TCNQ). Numerical calculations and experimental results explain that Joule-annealing and doping modulate the electronic states (Fermi energy level) of FWCNTs, resulting in extremely large thermoelectric power factor of 2250 mu Wm(-1) K-2 at a measurement temperature of 423K. Joule-annealing removes amorphous carbon on the surface of the CNT yarn, which facilitates doping in the subsequent step, and leads to higher Seebeck coefficient due to the transformation from (semi) metallic to semiconductor behavior. Doping also significantly increases the electrical conductivity due to the effective charge transfers between CNT yarn and F4TCNQ upon the removal of amorphous carbon after Joule-annealing.
キーワード
Materials science
Nanoscience and technology
発行日
2020-04-29
出版物タイトル
Scientific Reports
10巻
1号
出版者
Nature
開始ページ
7307
ISSN
2045-2322
資料タイプ
学術雑誌論文
言語
English
OAI-PMH Set
岡山大学
著作権者
© The Author(s) 2020
論文のバージョン
publisher
PubMed ID
DOI
Web of Science KeyUT
関連URL
isVersionOf https://doi.org/10.1038/s41598-020-64435-0
ライセンス
http://creativecommons.org/licenses/by/4.0/
助成機関名
日本学術振興会
助成番号
17K20065
18H01708