@article{120386,
  author = {C. Punckt and F. Muckel and S. Wolff and I.A. Aksay and C. A. Chavarin and G. Bacher and W. Mertin},
  title = {The effect of degree of reduction on the electrical properties of functionalized graphene sheets},
  abstract = { We study the effect of carbon to oxygen ratio (C/O) on the electrical resistance of functionalized graphene sheets prepared by thermal exfoliation and reduction of graphite oxide at various temperatures. Using a 2-probe technique in conjunction with Kelvin probe force microscopy, we observe a transition from high-resistance (\>400 k Omega/sq) nonlinear current/voltage characteristics at low C/O to low-resistance (\<10 k Omega/sq) linear behavior at high C/O, indicating a transition from hopping to diffusive electron transport. Simultaneously, the metal-graphene contacts change from high-resistance Schottky-type behavior to nearly non-invasive metal-metal contact characteristics. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4775582] },
  year = {2013},
  journal = {Applied Physics Letters},
  volume = {102},
  month = {01/2013},
  isbn = {0003-6951},
  language = {eng},
}