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

doi:10.1063/1.4775582

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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93 Scopus citations

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 language	English (US)
Article number	023114
Journal	Applied Physics Letters
Volume	102
Issue number	2
DOIs	https://doi.org/10.1063/1.4775582
State	Published - Jan 14 2013

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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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.",

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AU - Punckt, Christian

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AU - Wolff, Svenja

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AU - Chavarin, Carlos A.

AU - Bacher, Gerd

AU - Mertin, Wolfgang

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