Control of anisotropic conduction of carbon nanotube sheets and their use as planar-type thermoelectric conversion materials

Masamichi Matsumoto, Ryohei Yamaguchi, Keisuke Shima, Masakazu Mukaida, Motohiro Tomita, Takanobu Watanabe, Takao Ishida, Tsuyohiko Fujigaya

Research output: Contribution to journalArticlepeer-review

Abstract

The large anisotropic thermal conduction of a carbon nanotube (CNT) sheet that originates from the in-plane orientation of one-dimensional CNTs is disadvantageous for thermoelectric conversion using the Seebeck effect since the temperature gradient is difficult to maintain in the current flow direction. To control the orientation of the CNTs, polymer particles are introduced as orientation aligners upon sheet formation by vacuum filtration. The thermal conductivities in the in-plane direction decrease as the number of polymer particles in the sheet increases, while that in the through-plane direction increases. Consequently, a greater temperature gradient is observed for the anisotropy-controlled CNT sheet as compared to that detected for the CNT sheet without anisotropy control when a part of the sheet is heated, which results in a higher power density for the planar-type thermoelectric device. These findings are quite useful for the development of flexible and wearable thermoelectric batteries using CNT sheets.

Original languageEnglish
Pages (from-to)272-279
Number of pages8
JournalScience and Technology of Advanced Materials
Volume22
Issue number1
DOIs
Publication statusPublished - 2021

Keywords

  • 102 Porous / Nanoporous / Nanostructured materials
  • 104 Carbon and related materials
  • 210 Thermoelectronics / Thermal transport / insulators
  • 50 Energy Materials
  • Carbon nanotubes
  • anisotropy
  • electrical conductivity
  • polymer particle
  • sacrificial template
  • thermal conductivity
  • thermoelectric conversion
  • wearable battery

ASJC Scopus subject areas

  • Materials Science(all)

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