Structure and dynamics investigations of a partially hydrogenated graphene/Ni(111) surface
| Autor: | Anton Tamtögl, John Ellis, William Allison, Emanuel Bahn, Peter Fouquet |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Diffraction
Materials science Hydrogen Analytical chemistry FOS: Physical sciences chemistry.chemical_element 02 engineering and technology 01 natural sciences law.invention law Desorption Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Atom Physics::Atomic and Molecular Clusters General Materials Science Physics::Atomic Physics 010306 general physics Helium atom scattering Surface diffusion Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Graphene Scattering Materials Science (cond-mat.mtrl-sci) General Chemistry 021001 nanoscience & nanotechnology chemistry Atomic physics 0210 nano-technology |
| Popis: | 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 E a = ( 89 ± 7 ) meV and E d = ( 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. |
| Databáze: | OpenAIRE |
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