Journal
SMALL
Volume 8, Issue 10, Pages 1607-1613Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201101908
Keywords
electronic structure; graphene; graphite; hydrogenation; scanning tunneling microscopy
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Funding
- Comunidad de Madrid (Spain)
- Universidad Autonoma de Madrid (Spain)
- Groningen Graduate School of Science
- Zernike Institute for Advanced Materials
- Netherlands Organization for Scientific Research (NWO-CW) through a VENI
- Foundation for Fundamental Research on Matter [FOM G-08]
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The effects of hydrogenation on the topography and electronic properties of graphene and graphite surfaces are studied by scanning tunneling microscopy and spectroscopy. The surfaces are chemically modified using an Ar/H2 plasma. By analyzing thousands of scanning tunneling spectroscopy measurements it is determined that the hydrogen chemisorption on the surface of graphite/graphene opens on average an energy bandgap of 0.4 eV around the Fermi level. Although the plasma treatment modifies the surface topography in an irreversible way, the change in the electronic properties can be reversed by moderate thermal annealing and the samples can be hydrogenated again to yield a similar, but slightly reduced, semiconducting behavior after the second hydrogenation.
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