Local voltage drop in a single functionalized graphene sheet characterized by Kelvin probe force microscopy

Liang Yan, Christian Punckt, Ilhan A. Aksay, Wolfgang Mertin, Gerd Bacher

Research output: Contribution to journalArticle

64 Scopus citations

Abstract

We studied the local voltage drop in functionalized graphene sheets of subμm size under external bias conditions by Kelvin probe force microscopy. Using this noninvasive experimental approach, we measured ohmic current-voltage characteristics and an intrinsic conductivity of about 3.7 × 10 5 S/m corresponding to a sheet resistance of 2.7 kΩ/sq under ambient conditions for graphene produced via thermal reduction of graphite oxide. The contact resistivity between functionalized graphene and metal electrode was found to be <6.3 × 10-7 Ωcm2.

Original languageEnglish (US)
Pages (from-to)3543-3549
Number of pages7
JournalNano Letters
Volume11
Issue number9
DOIs
StatePublished - Sep 14 2011

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Keywords

  • Functionalized graphene
  • Kelvin probe force microscopy
  • contact resistance
  • electrical conductivity
  • sheet resistance

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