Electronic transport properties of individual chemically reduced graphene oxide sheets

Nano Lett. 2007 Nov;7(11):3499-503. doi: 10.1021/nl072090c. Epub 2007 Oct 18.


Individual graphene oxide sheets subjected to chemical reduction were electrically characterized as a function of temperature and external electric fields. The fully reduced monolayers exhibited conductivities ranging between 0.05 and 2 S/cm and field effect mobilities of 2-200 cm2/Vs at room temperature. Temperature-dependent electrical measurements and Raman spectroscopic investigations suggest that charge transport occurs via variable range hopping between intact graphene islands with sizes on the order of several nanometers. Furthermore, the comparative study of multilayered sheets revealed that the conductivity of the undermost layer is reduced by a factor of more than 2 as a consequence of the interaction with the Si/SiO2 substrate.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Crystallization
  • Electric Conductivity
  • Electrochemistry / methods
  • Electronics
  • Graphite / chemistry*
  • Microscopy, Atomic Force
  • Nanoparticles / chemistry
  • Nanostructures
  • Nanotechnology / methods*
  • Oxides / chemistry*
  • Silicon Dioxide / chemistry
  • Spectrum Analysis, Raman
  • Surface Properties
  • Temperature


  • Oxides
  • Silicon Dioxide
  • Graphite