The effect of degree of reduction on the electrical properties of functionalized graphene sheets

Citation:

Punckt, C. ; Muckel, F. ; Wolff, S. ; Aksay, I. A. ; Chavarin, C. A. ; Bacher, G. ; Mertin, W. The effect of degree of reduction on the electrical properties of functionalized graphene sheets. Applied Physics Letters 2013, 102.

Date Published:

Jan

ISBN Number:

0003-6951

Accession Number:

WOS:000313670200091

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]