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

Christian Punckt, Franziska Muckel, Svenja Wolff, Ilhan A. Aksay, Carlos A. Chavarin, Gerd Bacher, Wolfgang Mertin

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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 kΩ/sq) nonlinear current/voltage characteristics at low C/O to low-resistance (<10 kΩ/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.

Original languageEnglish (US)
Article number023114
JournalApplied Physics Letters
Volume102
Issue number2
DOIs
StatePublished - Jan 14 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Punckt, C., Muckel, F., Wolff, S., Aksay, I. A., Chavarin, C. A., Bacher, G., & Mertin, W. (2013). The effect of degree of reduction on the electrical properties of functionalized graphene sheets. Applied Physics Letters, 102(2), [023114]. https://doi.org/10.1063/1.4775582