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Chemical Vapor Deposition of Graphene on Copper from Methane, Ethane and Propane: Evidence for Bilayer Selectivity

Authors

  • Jonathan K. Wassei,

    1. Department of Chemistry & Biochemistry and California NanoSystems Institute, University of California, Los Angeles, CA, 90095
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  • Matthew Mecklenburg,

    1. Department of Physics & Astronomy and California NanoSystems Institute, University of California, Los Angeles, CA, 90095
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  • Jaime A. Torres,

    1. Department of Chemistry & Biochemistry and California NanoSystems Institute, University of California, Los Angeles, CA, 90095
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  • Jesse D. Fowler,

    1. Micro/Nano Technology Department, Space Materials Laboratory, The Aerospace Corporation, P.O. Box 92957/M2-248, Los Angeles, CA, 90009
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  • B. C. Regan,

    1. Department of Physics & Astronomy and California NanoSystems Institute, University of California, Los Angeles, CA, 90095
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  • Richard B. Kaner,

    Corresponding author
    1. Department of Chemistry & Biochemistry and California NanoSystems Institute, University of California, Los Angeles, CA, 90095
    2. Department of Materials Science and Engineering and California NanoSystems Institute, University of California, Los Angeles, CA, 90095
    • Department of Chemistry & Biochemistry and California NanoSystems Institute, University of California, Los Angeles, CA, 90095
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  • Bruce H. Weiller

    Corresponding author
    1. Micro/Nano Technology Department, Space Materials Laboratory, The Aerospace Corporation, P.O. Box 92957/M2-248, Los Angeles, CA, 90009
    • Micro/Nano Technology Department, Space Materials Laboratory, The Aerospace Corporation, P.O. Box 92957/M2-248, Los Angeles, CA, 90009.
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Abstract

To study the effects of hydrocarbon precursor gases, graphene is grown by chemical vapor deposition from methane, ethane, and propane on copper foils. The larger molecules are found to more readily produce bilayer and multilayer graphene, due to a higher carbon concentration and different decomposition processes. Single- and bilayer graphene can be grown with good selectivity in a simple, single-precursor process by varying the pressure of ethane from 250 to 1000 mTorr. The bilayer graphene is AB-stacked as shown by selected area electron diffraction analysis. Additionally propane is found to only produce a combination of single- to few-layer and turbostratic graphene. The percent coverage is investgated using Raman spectroscopy and optical, scanning electron, and transmission electron microscopies. The data are used to discuss a possible mechanism for the second-layer growth of graphene involving the different cracking pathways of the hydrocarbons.

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