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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 language | English |
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Pages (from-to) | 504 |
Number of pages | 510 |
Journal | Carbon |
Volume | 114 |
DOIs | |
Publication status | Published - Dec 2016 |
Keywords
- Graphene
- Ni(111)
- Hydrogenation
- Helium atom scattering
Fields of Expertise
- Advanced Materials Science
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