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

Donghoon Lee, Kyoungah Cho, Jinyong Choi, Sangsig Kim

Research output: Contribution to journalArticle

12 Citations (Scopus)

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 μV/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 μV/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.

Original languageEnglish
Pages (from-to)250-252
Number of pages3
JournalMaterials Letters
Volume142
DOIs
Publication statusPublished - 2015 Mar 1

Keywords

  • Composite materials
  • Energy storage and conversion
  • Nanofibers
  • Semiconductors
  • Thermoelectric

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

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