"Reversible graphene-metal contact through hydrogenation"

Srivats Rajasekaran: Sarp Kaya, Frank Abild-Pedersen, Toyli Anniyev, Fan Yang, Dario Stacchiola, Hirohito Ogasawara, Anders Nilsson; Physical Review B, 08/08/12.

Additional Authors: Sarp Kaya, Frank Abild-Pedersen, Toyli Anniyev, Fan Yang, Dario Stacchiola, Hirohito Ogasawara, Anders Nilsson

Abstract:

We use x-ray spectroscopy and density functional theory to investigate the hydrogenation-induced electronic
structure changes in graphene on Pt(111). The atom-specific properties of the spectroscopy allow for a direct
projection of the band structure onto the carbon atoms; this was compared with the calculated density of
states. Instead of the generally expected band opening behavior, we observe states at the Fermi level in the
carbon-projected density of states. Hydrogenation is accompanied by pinning of the graphene to the substrate
through the formation of local C–Pt bonds which cause the graphene layer to become metallic upon hydrogenation.