Phonon-glass electron-crystals in ZnO-multiwalled carbon nanotube nanocomposites

Woo Hyun Nam, Bo Bae Kim, Young Soo Lim, Kyun Seong Dae, Won Seon Seo, Hyung Ho Park, Jeong Yong Lee

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)12941-12948
Number of pages8
JournalNanoscale
Volume9
Issue number35
DOIs
Publication statusPublished - 2017 Sep 21

Bibliographical note

Funding Information:
This work was supported by IBS-R004-D1 and also by the Mid-career Researcher Program (2015R1A2A2A01005929) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology, Republic of Korea.

Publisher Copyright:
© 2017 The Royal Society of Chemistry.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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