Highly conductive few-layer graphene/Al 2O 3 nanocomposites with tunable charge carrier type

Yuchi Fan, Wan Jiang, Akira Kawasaki

Research output: Contribution to journalArticlepeer-review

113 Citations (Scopus)

Abstract

An ex situ strategy for fabrication of graphene oxide (GO)/metal oxide hybrids without assistance of surfactant is introduced. Guided by this strategy, GO/Al 2O 3 hybrids are fabricated by two kinds of titration methods in which GO and Al 2O 3 colloids are utilized as titrant for hybrids of low and high GO content respectively. After sintered by spark plasma sintering, few-layer graphene (FG)/Al 2O 3 nanocomposites are obtained and GO is well reduced to FG simultaneously. A percolation threshold as low as 0.38 vol.% is achieved and the electrical conductivity surpasses 10 3 Sm -1 when FG content is only 2.35 vol.% in FG/Al 2O 3 composite, revealing the homogeneous dispersion and high quality of as-prepared FG. Furthermore, it is found that the charge carrier type changes from p- to n-type as graphene content becomes higher. It is deduced that this conversion is related to the doping effect induced by Al 2O 3 matrix and is thickness-dependent with respect to FG.

Original languageEnglish
Pages (from-to)3882-3889
Number of pages8
JournalAdvanced Functional Materials
Volume22
Issue number18
DOIs
Publication statusPublished - 2012 Sep 25

Keywords

  • charge carrier type
  • electrical conductivity
  • graphene
  • nanocomposite

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry

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