Chemical exfoliation procedure for graphene deposition

ORAL

Abstract

Mechanical exfoliation techniques for graphene production yield flakes which are too small and too rare for feasible large-scale experiments or commercial device fabrication. We present a systematic evaluation of the steps involved in chemical exfoliation of graphite to generate suspended graphene sheets. The approach is based on the solubilizing of a graphite intercalation compound in a polar solvent, analogous to solubilization of CNT salts [1] and recently reported for graphene [2]. A shift in the Raman G peak of graphite provides a metric of the degree of intercalation of lithium and naphthalene into graphite flakes. To optimize deposition onto SiO$_{2}$ substrates, we compare drop casting, spin-coating and dip-coating, as well as the effects of different surface treatments (UV ozone, oxygen plasma, functionalization). [1] A. P\'{e}nicaud, et al., \textit{J. Am. Chem. Soc. }\textbf{127}, 8 (2005). [2] C. Vall\'{e}s, et al., \textit{J. Am. Chem. Soc.} \textbf{130}, 15802 (2008).

*Supported by NSF Grant No. DMR-0804976 and UMD-NSF-MRSEC-SEF.

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Authors

  • Michelle Zimmermann

    • Department of Physics and University of Maryland Materials Research Science and Engineering Center, University of Maryland, College Park, MD 20742

  • Mahito Yamamoto

    • Department of Physics and University of Maryland Materials Research Science and Engineering Center, University of Maryland, College Park, MD 20742

  • Brad Conrad

    • Department of Physics and University of Maryland Materials Research Science and Engineering Center, University of Maryland, College Park, MD 20742
    • Physics Department, University of Maryland, College Park, MD 20742
    • University of Maryland College Park

  • Jian-Hao Chen

    • University of Maryland, College Park
    • Department of Physics and University of Maryland Materials Research Science and Engineering Center, University of Maryland, College Park, MD 20742
    • Dept of Physics, Center for Nanophysics and Advanced Materials, and Materials Research Science and Engineering Center, Univ. of Maryland, College Park
    • University of Maryland
    • Department of Physics, University of Maryland
    • Materials Research Science and Engineering Center, Center for Nanophysics and Advanced Materials, Dept of Physics, Univ. of Maryland, College Park, MD

  • Ellen Williams

    • University of Maryland, College Park
    • Department of Physics and University of Maryland Materials Research Science and Engineering Center, University of Maryland, College Park, MD 20742
    • University of Maryland
    • LPS, CNAM, and the DOP, UM
    • Physics Department, University of Maryland, College Park, MD 20742
    • Materials Research Science and Engineering Center, Center for Nanophysics and Advanced Materials, Dept of Physics, Univ. of Maryland, College Park, MD
    • University of Maryland College Park
    • Dept. of Physics, U. of Maryland - College Park
    • Department of Physics and Center for Nanophysics and Advanced Materials, University of Maryland, College Park, MD 20742-4111, USA