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Open AccessFeature PaperArticle

Thermostability of Hybrid Thermoelectric Materials Consisting of Poly(Ni-ethenetetrathiolate), Polyimide and Carbon Nanotubes

1
Graduate School of Engineering, Tokyo University of Science Yamaguchi, Daigakudori, SanyoOnoda, Yamaguchi 756-0884, Japan
2
Department of Applied Chemistry, Faculty of Engineering, Tokyo University of Science Yamaguchi, Daigakudori, SanyoOnoda, Yamaguchi 756-0884, Japan
3
Department of Applied Chemistry, Tokyo University of Science, Yamaguchi 756-0884, Japan
*
Author to whom correspondence should be addressed.
Materials 2017, 10(7), 824; https://doi.org/10.3390/ma10070824
Received: 31 May 2017 / Revised: 4 July 2017 / Accepted: 14 July 2017 / Published: 18 July 2017
(This article belongs to the Special Issue Advances in Thermoelectric Materials)
Three-component organic/inorganic hybrid films were fabricated by drop-casting the mixed dispersion of nanodispersed-poly(nickel 1,1,2,2-ethenetetrathiolate) (nano-PETT), polyimide (PI) and super growth carbon nanotubes (SG-CNTs) in N-methylpyrrolidone (NMP) at the designed ratio on a substrate. The dried nano-PETT/PI/SG-CNT hybrid films were prepared by the stepwise cleaning of NMP and methanol, and were dried once more. The thermoelectric properties of Seebeck coefficient S and electrical conductivity σ were measured by a thin-film thermoelectric measurement system ADVANCE RIKO ZEM-3M8 at 330–380 K. The electrical conductivity of nano-PETT/PI/SG-CNT hybrid films increased by 1.9 times for solvent treatment by clearing insulated of polymer. In addition, the density of nano-PETT/PI/SG-CNT hybrid films decreased 1.31 to 0.85 g·cm−3 with a decrease in thermal conductivity from 0.18 to 0.12 W·m−1·K−1. To evaluate the thermostability of nano-PETT/PI/SG-CNT hybrid films, the samples were kept at high temperature and the temporal change of thermoelectric properties was measured. The nano-PETT/PI/SG-CNT hybrid films were rather stable at 353 K and kept their power factor even after 4 weeks. View Full-Text
Keywords: organic/inorganic hybrid thermoelectric materials; polyimide; poly(nickel 1,1,2,2-ethenetetrathiolate); carbon nanotube organic/inorganic hybrid thermoelectric materials; polyimide; poly(nickel 1,1,2,2-ethenetetrathiolate); carbon nanotube
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Oshima, K.; Sadakata, S.; Asano, H.; Shiraishi, Y.; Toshima, N. Thermostability of Hybrid Thermoelectric Materials Consisting of Poly(Ni-ethenetetrathiolate), Polyimide and Carbon Nanotubes. Materials 2017, 10, 824.

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