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나노물질 및 화학반응 연구단
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A gigantically increased ratio of electrical to thermal conductivity and synergistically enhanced thermoelectric properties in interface-controlled TiO2-RGO nanocomposites

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Title
A gigantically increased ratio of electrical to thermal conductivity and synergistically enhanced thermoelectric properties in interface-controlled TiO2-RGO nanocomposites
Author(s)
Woo Hyun Nam; Young Soo Lim; Woochul Kim; Hyeon Kook Seo; Kyun Seong Dae; Soonil Lee; Won-Seon Seo; Jeong Yong Lee
Publication Date
2017-06
Journal
NANOSCALE, v.9, no.23, pp.7830 - 7838
Publisher
ROYAL SOC CHEMISTRY
Abstract
We report synergistically enhanced thermoelectric properties through the independently controlled charge and thermal transport properties in a TiO2-reduced graphene oxide (RGO) nanocomposite. By the consolidation of TiO2-RGO hybrid powder using spark plasma sintering, we prepared an interfacecontrolled TiO2-RGO nanocomposite where its grain boundaries are covered with the RGO network. Both the enhancement in electrical conductivity and the reduction in thermal conductivity were simultaneously achieved thanks to the beneficial effects of the RGO network, and detailed mechanisms are discussed. This led to the gigantic increase in the ratio of electrical to thermal conductivity by six orders of magnitude and also the synergistic enhancement in the thermoelectric figure of merit by two orders. Our results present a strategy for the realization of 'phonon-glass electron-crystals' through interface control using graphene in graphene hybrid thermoelectric materials © The Royal Society of Chemistry
URI
https://pr.ibs.re.kr/handle/8788114/4798
ISSN
2040-3364
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
Files in This Item:
Nanoscale, 2017, 9, 7830–7838.pdfDownload

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