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Gigantically increased ratio of electrical to thermal conductivity and synergistically enhanced thermoelectric properties in interface-controlled TiO2-RGO nanocomposite

Abstract

We report synergistically enhanced thermoelectric properties through the independently controlled charge and thermal transport properties in TiO2-reduced graphene oxide (RGO) nanocomposite. By the consolidation of TiO2-RGO hybrid powder using spark plasma sintering, we prepared the interface-controlled TiO2-RGO nanocomposite where its grain boundaries are covered with 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 were discussed. It led to the gigantic increase in the ratio of electrical to thermal conductivity by six orders of magnitude and also the synergistic enhancement in thermoelectric figure of merit by two orders. Our results present a strategy for the realization of ‘phonon-glass electron-crystal’ through the interface control using graphene in graphene hybrid thermoelectric materials.

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Publication details

The article was received on 07 Feb 2017, accepted on 02 May 2017 and first published on 04 May 2017


Article type: Paper
DOI: 10.1039/C7NR00911A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Gigantically increased ratio of electrical to thermal conductivity and synergistically enhanced thermoelectric properties in interface-controlled TiO2-RGO nanocomposite

    W. H. Nam, Y. S. Lim, W. Kim, H. K. Seo, K. S. Dae, S. Lee, W. Seo and J. Y. Lee, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR00911A

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