We examine the effect of UV/O3 oxidation on the thermoelectric properties of semiconducting carbon nanotube films. The oxidative UV/O3 treatment leads to the introduction of epoxy and carbonyl groups and a significant increase in the thermoelectric power factor up to 140 μW m−1 K−2. This power factor is three times larger than that of chemically-doped films because of the enhanced Seebeck coefficient. Characterization with Raman and mid-IR absorption/extinction spectroscopy reveals that the UV/ozone treatment results in simultaneous charge carrier doping and defect formation. This simple way of enhancing thermoelectric properties is suitable for the production of large-area, flexible thermoelectric devices based on semiconducting carbon nanotubes.
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7 October 2019
Research Article|
October 03 2019
Enhanced thermoelectric properties of semiconducting carbon nanotube films by UV/ozone treatment
Special Collection:
Advanced Thermoelectrics
Yoshiyuki Nonoguchi
;
Yoshiyuki Nonoguchi
a)
1
Division of Materials Science, Nara Institute of Science and Technology
, Ikoma 630-0192, Japan
2
JST, PRESTO
, Kawaguchi 332-0012, Japan
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Atsushi Tani;
Atsushi Tani
1
Division of Materials Science, Nara Institute of Science and Technology
, Ikoma 630-0192, Japan
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Takuya Kitano;
Takuya Kitano
1
Division of Materials Science, Nara Institute of Science and Technology
, Ikoma 630-0192, Japan
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Tsuyoshi Kawai
Tsuyoshi Kawai
a)
1
Division of Materials Science, Nara Institute of Science and Technology
, Ikoma 630-0192, Japan
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Note: This paper is part of the special topic on Advanced Thermoelectrics.
J. Appl. Phys. 126, 135108 (2019)
Article history
Received:
July 03 2019
Accepted:
September 08 2019
Citation
Yoshiyuki Nonoguchi, Atsushi Tani, Takuya Kitano, Tsuyoshi Kawai; Enhanced thermoelectric properties of semiconducting carbon nanotube films by UV/ozone treatment. J. Appl. Phys. 7 October 2019; 126 (13): 135108. https://doi.org/10.1063/1.5118694
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