Isotropic Seebeck coefficient of aligned single-wall carbon nanotube films

Fukuhara, Kengo; Ichinose, Yota; Nishidome, Hiroyuki; Yomogida, Yohei; Katsutani, Fumiya; Komatsu, Natsumi; Gao, Weilu; Kono, Junichiro; Yanagi, Kazuhiro

doi:10.1063/1.5066021

Isotropic Seebeck coefficient of aligned single-wall carbon nanotube films

Journal Article · Sun Dec 09 23:00:00 EST 2018 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5066021· OSTI ID:1609735

Fukuhara, Kengo ^[1]; Ichinose, Yota ^[2]; Nishidome, Hiroyuki ^[2]; Yomogida, Yohei ^[2]; Katsutani, Fumiya ^[3]; Komatsu, Natsumi ^[3]; Gao, Weilu ^[3]; ^[3]; Yanagi, Kazuhiro ^[2]

Tokyo Metropolitan Univ. (Japan); DOE/OSTI
Tokyo Metropolitan Univ. (Japan)
Rice Univ., Houston, TX (United States)

How the morphology of a macroscopic assembly of nanoobjects affects its properties is a long-standing question in nanomaterials science and engineering. Here, we examine how the thermoelectric properties of a flexible thin film of carbon nanotubes depend on macroscopic nanotube alignment. Specifically, we have investigated the anisotropy of the Seebeck coefficient of aligned and gated single-wall carbon nanotube thin films. We varied the Fermi level in a wide range, covering both the p-type and n-type regimes, using electrolyte gating. While we found the electrical conductivity along the nanotube alignment direction to be several times larger than that in the perpendicular direction, the Seebeck coefficient was found to be fully isotropic, irrespective of the Fermi level position. We provide an explanation for this striking difference in anisotropy between the conductivity and the Seebeck coefficient using Mott's theory of hopping conduction. Our experimental evidence for an isotropic Seebeck coefficient in an anisotropic nanotube assembly suggests a route toward controlling the thermoelectric performance of carbon nanotube thin films through morphology control.

View Accepted Manuscript (DOE)

Research Organization:: Rice Univ., Houston, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-06ER46308

OSTI ID:: 1609735

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 24 Vol. 113; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (3)

One-directional thermal transport in densely aligned single-wall carbon nanotube films Yamaguchi, Shingi; Tsunekawa, Issei; Komatsu, Natsumi Applied Physics Letters, Vol. 115, Issue 22 https://doi.org/10.1063/1.5127209	journal	November 2019
Macroscopically aligned carbon nanotubes for flexible and high-temperature electronics, optoelectronics, and thermoelectrics Gao, Weilu; Komatsu, Natsumi; Taylor, Lauren W. Journal of Physics D: Applied Physics, Vol. 53, Issue 6 https://doi.org/10.1088/1361-6463/ab4ca4	journal	December 2019
One-directional thermal transport in densely aligned single-wall carbon nanotube films Yamaguchi, Shingi; Tsunekawa, Issei; Komatsu, Natsumi arXiv https://doi.org/10.48550/arxiv.1911.11340	text	January 2019

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Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
Density of states
Electrical conductivity
Electrolytes
Hopping transport
Nanomaterials
Nanotubes
Physics
Thermoelectric effects
Thermoelectric materials
Thin films

Isotropic Seebeck coefficient of aligned single-wall carbon nanotube films

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References (15)

Cited By (3)

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