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Andres Castellanos-Gomez, Magdalena Wojtaszek, Arramel, Nikolaos Tombros and Bart J. van Wees Reversible Hydrogenation and Bandgap Opening of Graphene and Graphite Surfaces Probed by Scanning Tunneling Spectroscopy Small 8

Version of Record online: 19 MAR 2012 | DOI: 10.1002/smll.201101908

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The effect of hydrogenation of graphene and graphite surfaces is studied by scanning tunneling microscopy and spectroscopy. An Ar/H2 plasma is used to chemically modify the surface of the samples, opening an energy bandgap of 0.4 eV. Moderate annealing is enough to close this bandgap and the samples can be hydrogenated again to yield a similar semiconducting behavior.

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