One-Minute Joule Annealing Enhances the Thermoelectric Properties of Carbon Nanotube Yarns via the Formation of Graphene at the Interface
- Masaki Hada*Masaki Hada*E-mail: [email protected]Graduate School of Natural Science and Technology, , Okayama University, Okayama 700-8530, JapanTsukuba Research Center for Interdisciplinary Materials Science (TREMS), Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8573, JapanMore by Masaki Hada,
- Taisuke HasegawaTaisuke HasegawaMaterials Open Platform for Chemical Industry, External Collaboration Division, National Institute for Materials Science, Tsukuba 305-0047, JapanMore by Taisuke Hasegawa,
- Hirotaka InoueHirotaka InoueGraduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, JapanMore by Hirotaka Inoue,
- Makito TakagiMakito TakagiGraduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-8628, JapanMore by Makito Takagi,
- Kazuki OmotoKazuki OmotoGraduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, JapanMore by Kazuki Omoto,
- Daiki ChujoDaiki ChujoGraduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, JapanMore by Daiki Chujo,
- Shogo IemotoShogo IemotoGraduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, JapanMore by Shogo Iemoto,
- Taihei KurodaTaihei KurodaGraduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, JapanMore by Taihei Kuroda,
- Taiga MorimotoTaiga MorimotoGraduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, JapanMore by Taiga Morimoto,
- Takuma HayashiTakuma HayashiGraduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, JapanMore by Takuma Hayashi,
- Toru IijimaToru IijimaGraduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, JapanMore by Toru Iijima,
- Tomoharu TokunagaTomoharu TokunagaGraduate School of Engineering, Nagoya University, Nagoya 464-8603, JapanMore by Tomoharu Tokunaga,
- Naoshi IkedaNaoshi IkedaGraduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, JapanMore by Naoshi Ikeda,
- Kazuhiro FujimoriKazuhiro FujimoriGraduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, JapanMore by Kazuhiro Fujimori,
- Chihiro ItohChihiro ItohFaculty of System Engineering, Wakayama University, Wakayama 640-8510, JapanMore by Chihiro Itoh,
- Takeshi NishikawaTakeshi NishikawaGraduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, JapanMore by Takeshi Nishikawa,
- Yoshifumi YamashitaYoshifumi YamashitaGraduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, JapanMore by Yoshifumi Yamashita,
- Toshihiko KiwaToshihiko KiwaGraduate School of Interdisciplinary Science and Engineering in Health Systems, Okayama University, Okayama 700-8530, JapanMore by Toshihiko Kiwa,
- Shin-ya KoshiharaShin-ya KoshiharaDepartment of Chemistry, Tokyo Institute of Technology, Tokyo 152-8551, JapanMore by Shin-ya Koshihara,
- Satoshi Maeda*Satoshi Maeda*E-mail: [email protected]Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo 001-0021, JapanDepartment of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, JapanResearch and Services Division of Materials Data and Integrated System (MaDIS), National Institute for Materials Science, Tsukuba 305-0044, JapanMore by Satoshi Maeda, and
- Yasuhiko Hayashi*Yasuhiko Hayashi*E-mail: [email protected]Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, JapanMore by Yasuhiko Hayashi
Abstract

Interfaces in nanocarbon materials are highly important, as they determine the properties of carbon-based devices. In terms of carrier and thermal transport properties, the interfacial features are often more important than the intrinsic characteristics. Herein, we describe how 1 min Joule annealing of carbon nanotube (CNT) yarns can convert the interfacial amorphous carbon into graphene fragments. After 1 min Joule annealing, we have obtained multiwalled CNT yarns with extremely high Seebeck coefficients (±100 μV/K) and high thermoelectric power factor (400 and 1000 μW/mK2) at room temperature, both with or without polyethylenimine doping. Theoretical simulations and experimental measurements helped to determine the optimal annealing conditions in terms of a rapid transformation of the interfacial amorphous carbon between the bundled CNTs in the yarn into graphene fragments at ∼2000 K. The present approach represents significant progress in energy materials science, as it provides a guiding principle for the design of interfaces in nanocarbon materials with potential applications in energy-harvesting systems.
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