journal article·2019-10-28

One-Minute Joule Annealing Enhances the Thermoelectric Properties of Carbon Nanotube Yarns via the Formation of Graphene at the Interface

Masaki Hada, Taisuke Hasegawa, Hirotaka Inoue, Makito Takagi, Kazuki Omoto, Daiki Chujo, Shogo Iemoto, Taihei Kuroda, Taiga Morimoto, Takuma Hayashi, Toru Iijima, Tomoharu Tokunaga, Naoshi Ikeda, Kazuhiro Fujimori, Chihiro Itoh, Takeshi Nishikawa, Yoshifumi Yamashita, Toshihiko Kiwa, Shin-ya Koshihara, Satoshi Maeda, Yasuhiko Hayashi

ACS Applied Energy Materials· Volume 2· Issue 10
Publisher page

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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Research context

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal properties of materials · Graphene research and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Tsukuba Research Center for Interdisciplinary Materials Science (TREMS), Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8573, Japan

Materials Open Platform for Chemical Industry, External Collaboration Division, National Institute for Materials Science, Tsukuba 305-0047, Japan

Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-8628, Japan

Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan

Faculty of System Engineering, Wakayama University, Wakayama 640-8510, Japan

Department of Chemistry, Tokyo Institute of Technology, Tokyo 152-8551, Japan

Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo 001-0021, Japan

Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan

Research and Services Division of Materials Data and Integrated System (MaDIS), National Institute for Materials Science, Tsukuba 305-0044, Japan

Funding

Core Research for Evolutional Science and Technology · Japan Society for the Promotion of Science · Institute for Chemical Reaction Design and Discovery, Hokkaido University

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