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Issue 35, 2017
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Phonon-glass electron-crystals in ZnO-multiwalled carbon nanotube nanocomposites

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Abstract

We propose a strategy for enhancing thermoelectric performance through the realization of a ‘phonon-glass electron-crystal’ (PGEC) by interface control using multiwalled carbon nanotubes (MWCNTs). By the consolidation of undoped ZnO nanoparticles with MWCNTs (0.5, 1, and 2 wt%) using spark plasma sintering, we fabricated the interface-controlled ZnO-MWCNT nanocomposites, in which ZnO grains were surrounded with a MWCNT network. Both single crystal-like charge transport (electron-crystal) and considerably reduced thermal conductivity (phonon-glass) were achieved simultaneously thanks to the beneficial effects of the MWCNT network, and this led to the enhancement of the thermoelectric figure of merit. We discussed these findings on PGECs in the ZnO-MWCNT nanocomposites from the viewpoint of interface control in detail, and our strategy may provide a promising way to the realization of PGEC in other hybrid thermoelectric materials.

Graphical abstract: Phonon-glass electron-crystals in ZnO-multiwalled carbon nanotube nanocomposites

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Publication details

The article was received on 26 May 2017, accepted on 27 Jul 2017 and first published on 28 Jul 2017


Article type: Paper
DOI: 10.1039/C7NR03747C
Citation: Nanoscale, 2017,9, 12941-12948
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    Phonon-glass electron-crystals in ZnO-multiwalled carbon nanotube nanocomposites

    W. H. Nam, B. B. Kim, Y. S. Lim, K. S. Dae, W. Seo, H. Park and J. Y. Lee, Nanoscale, 2017, 9, 12941
    DOI: 10.1039/C7NR03747C

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