Thermoelectric properties of unoxidized graphene/Bi2Te2.7Se0.3 composites synthesized by exfoliation/re-assembly method

Jin Il Kim, Eun Sil Lee, Jong Young Kim, Soon Mok Choi, Kyu Hyoung Lee, Won Seon Seo

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Nanocomposites of n-type thermoelectric Bi2Te2.7Se0.3 (BTS) and unoxidized graphene (UG) were prepared from the exfoliated BTS and UG nanoplatelets. Polycrystalline BTS ingots were exfoliated into nanoscoll-type crystals by chemical exfoliation, and were re-assembled with UG nanoplatelets. The composites were chemically reduced by hydrazine hydrate and sintered by a spark-plasma-sintering method. The thermoelectric properties of the sintered composites were evaluated and exhibited decreased carrier concentration and increased thermal conductivity due to the embedded graphene. The peak ZT values for the UG/BTS-US and UG/BTS-EX composites were ∼0.8 at the UG concentration of 0.05 wt%.

Original languageEnglish
Pages (from-to)357-361
Number of pages5
JournalPhysica Status Solidi - Rapid Research Letters
Volume8
Issue number4
DOIs
Publication statusPublished - 2014 Apr

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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