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

Graphite
Graphene
Hydrogen
Helium
Scattering
Adsorption
Surface diffusion
Spectrometers
Monolayers
Desorption
Diffraction
Chemical activation
Atoms
Kinetics

Keywords

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

Fields of Expertise

  • Advanced Materials Science

Cite this

Structure and dynamics investigations of a partially hydrogenated graphene/Ni(111) surface. / Bahn, Emanuel; Tamtögl, Anton; Ellis, John; Allison, William; Fouquet, Peter.

In: Carbon, Vol. 114, 12.2016, p. 504.

Research output: Contribution to journalArticleResearchpeer-review

Bahn, Emanuel ; Tamtögl, Anton ; Ellis, John ; Allison, William ; Fouquet, Peter. / Structure and dynamics investigations of a partially hydrogenated graphene/Ni(111) surface. In: Carbon. 2016 ; Vol. 114. pp. 504.
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