AVS 55th International Symposium & Exhibition
    Graphene Topical Conference Tuesday Sessions
       Session GR+TF+NC-TuA

Paper GR+TF+NC-TuA4
Graphene on Graphite

Tuesday, October 21, 2008, 2:40 pm, Room 306

Session: Graphene: Characterization, Properties, and Application
Presenter: J.W. Choi, Kyung Hee University, South Korea
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Topmost graphne layer of graphite is investigated using scanning tunneling micropscopy and spectroscopy. Tunneling gap-distance, gap-voltage and bias polarity play an important role in the atomic image contrast and site-dependent tunneling spectra. The study revealed that the coupling and decoupling of the topmost graphene layer to the underlying graphite is occured because of the weak physical interaction between graphen layers, the electronically active and mechanically soft beta-carbon atoms of graphite and the strong tip-sample interaction.