title: Interlayer carbon bond formation induced by hydrogen adsorption in few-layer supported graphene.
abstract: We report on the hydrogen adsorption induced phase transition of a few layer graphene (1 to 4 layers) to a diamondlike structure on Pt(111) based on core level x-ray spectroscopy, temperature programed desorption, infrared spectroscopy, and density functional theory total energy calculations. The surface adsorption of hydrogen induces a hybridization change of carbon from the sp2 to the sp3 bond symmetry, which propagates through the graphene layers, resulting in interlayer carbon bond formation. The structure is stabilized through the termination of interfacial sp3 carbon atoms by the substrate. The structural transformation occurs as a consequence of high adsorption energy.
authors.affiliation: Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA and SIMES, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
authors.forename: Srivats
authors.initials: S
authors.lastname: Rajasekaran
authors.forename: Frank
authors.initials: F
authors.lastname: Abild-Pedersen
authors.forename: Hirohito
authors.initials: H
authors.lastname: Ogasawara
authors.forename: Anders
authors.initials: A
authors.lastname: Nilsson
authors.forename: Sarp
authors.initials: S
authors.lastname: Kaya