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).

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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