Controlled oxidation level of reduced graphene oxides and its effect on thermoelectric properties

Jaeyoo Choi, Nguyen D.K. Tu, Sang-Soo Lee, Hyunjung Lee, Jin Sang Kim, Heesuk Kim

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We investigated the thermoelectric properties of reduced graphene oxide (rGO) as a function of the oxidation level of rGO. rGO among graphene derivatives was selected as a thermoelectric material since rGO bucky paper shows low thermal conductivity due to the phonon scattering at the junctions of rGO nanoplatelets. The oxdation level of rGO was controlled by differing the amount of chemical reductant (hydrazine) used to reduce graphene oxide (GO) to rGO, which correspondingly affected the electrical conductivity and Seebeck coefficient of rGO film. In this study, the maximum of figure of merit (ZT) was found to reach to 1.1×10−4 at 298 K for rGO reduced with the hydrazine of 1000 μL. These results provide the first experimental evidence that the thermoelectric performance of graphene and its derivative can be controlled by the oxidation level of graphitic nanoplatelets.

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Original languageEnglish
Pages (from-to)1104-1108
Number of pages5
JournalMacromolecular Research
Volume22
Issue number10
DOIs
Publication statusPublished - 2014 Oct 17

Keywords

  • oxidation level
  • reduced graphene oxide
  • thermoelectric properties

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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