Structure and dynamics investigations of a partially hydrogenated graphene/Ni(111) surface

Emanuel Bahn, Anton Tamtögl, John Ellis, William Allison, Peter Fouquet

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Using helium-3 atom scattering, we have studied the adsorption kinetics, the structure and the diffusional dynamics of atomic hydrogen on the surface of a graphene monolayer on Ni(111). Diffraction measurements reveal a 4° rotated rectangular hydrogen overstructure. Hydrogen adsorption and desorption exhibit activation barriers of Ea = ( 89 ± 7 ) meV and Ed = ( 1.8 ± 0.2 ) eV, respectively. Helium-3 spin-echo measurements showed no decay of the spatial correlation function (or intermediate scattering function) within the time range of the spectrometer. Hence, we are able to set lower limits for a possible hydrogen surface diffusion rate.
Original languageEnglish
Pages (from-to)504
Number of pages510
JournalCarbon
Volume114
DOIs
Publication statusPublished - Dec 2016

    Fingerprint

Keywords

  • Graphene
  • Ni(111)
  • Hydrogenation
  • Helium atom scattering

Fields of Expertise

  • Advanced Materials Science

Cite this