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

Research output: Contribution to journal › Article › peer-review

126 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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10.1063/1.4775582

Cite this

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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 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.",

author = "Christian Punckt and Franziska Muckel and Svenja Wolff and Aksay, \{Ilhan A.\} and Chavarin, \{Carlos A.\} and Gerd Bacher and Wolfgang Mertin",

note = "Funding Information: The portion of the work at Princeton was supported by the Army Research Office (ARO)/Multidisciplinary Research Initiative (MURI) under Grant No. W911NF-09-1-476 and the Pacific Northwest National Laboratory (operated for the United States Department of Energy by Battelle) through Battelle Grant No. 66354. F.M. and S.W. acknowledge the SFB 445 of the Deutsche Forschungsgemeinschaft for the financial support. The work of C.A.C. was supported by The National Council on Science and Technology (CONACYT) Mexico under Grant No. 252826. We thank Michael A. Pope for assisting with FGS production.",

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doi = "10.1063/1.4775582",

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AU - Punckt, Christian

AU - Muckel, Franziska

AU - Wolff, Svenja

AU - Aksay, Ilhan A.

AU - Chavarin, Carlos A.

AU - Bacher, Gerd

AU - Mertin, Wolfgang

N1 - Funding Information: The portion of the work at Princeton was supported by the Army Research Office (ARO)/Multidisciplinary Research Initiative (MURI) under Grant No. W911NF-09-1-476 and the Pacific Northwest National Laboratory (operated for the United States Department of Energy by Battelle) through Battelle Grant No. 66354. F.M. and S.W. acknowledge the SFB 445 of the Deutsche Forschungsgemeinschaft for the financial support. The work of C.A.C. was supported by The National Council on Science and Technology (CONACYT) Mexico under Grant No. 252826. We thank Michael A. Pope for assisting with FGS production.

PY - 2013/1/14

Y1 - 2013/1/14

N2 - 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.

AB - 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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JO - Applied Physics Letters

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ER -

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

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