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Effect of mesoscale grains on thermoelectric characteristics of aligned ZnO/INP composite nanofibers

Authors
Lee, DonghoonCho, KyoungahChoi, JinyongKim, Sangsig
Issue Date
1-3월-2015
Publisher
ELSEVIER SCIENCE BV
Keywords
Energy storage and conversion; Thermoelectric; Semiconductors; Composite materials; Nanofibers
Citation
MATERIALS LETTERS, v.142, pp.250 - 252
Indexed
SCIE
SCOPUS
Journal Title
MATERIALS LETTERS
Volume
142
Start Page
250
End Page
252
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/94166
DOI
10.1016/j.matlet.2014.12.029
ISSN
0167-577X
Abstract
The thermoelectric characteristics of aligned ZnO/PVP composite nanofibers (NFs) prepared by electrospinning and subsequent thermal annealing were examined by the comparison between their mesoscale structure and the Seebeck coefficient. Rapid thermal annealing of NFs produces mesoscale grains and a Seebeck coefficient of -313.7 mu V/K. In contrast, the NFs annealed in a conventional furnace have a straight-line shape without any discernible grains, and their Seebeck coefficient is largely four times smaller (-82.1 mu V/K). The difference in the structural morphology of the NFs results in their difference in Seebeck coefficients. The mesoscale grains of the NFs annealed by rapid thermal annealing are efficient in reducing thermal conductivity and contribute to an enhancement of the thermoelectric properties. (C) 2014 Elsevier B.V. All rights reserved.
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