期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 14, 期 15, 页码 5153-5163出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2cp40278e
关键词
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资金
- Cluster of Excellence Engineering of Advanced Materials''
- Alexander-von-Humboldt Foundation
- [SPP 1191]
Ultrathin films of the ionic liquid 1,3-dimethylimidazolium bis(trifluoromethylsulfonyl) imide ([C(1)C(1)Im][Tf2N]) were deposited on differently terminated Ni(111) single crystal surfaces. The initial wetting behaviour, the growth characteristics, the molecular arrangement at the interface, and thermal reactivity were investigated using angle-resolved X-ray photoelectron spectroscopy (ARXPS). On clean Ni(111), the initial growth occurs in a layer-by-layer mode. At submonolayer coverages up to at least 0.40 ML, a preferential arrangement of the IL ions in a bilayer structure, with the imidazolium cations in contact with the Ni surface atoms and the anions on top of the cation, is deduced. For higher coverages, a transition to a checkerboard-type arrangement occurs, which is most likely due to repulsive dipole-dipole interactions in the first layer. An overall preference for a checkerboard-type adsorption behaviour, i.e., anions and cations adsorbing next to each other, is found on the oxygen-precovered O(root 3 x root 3)R30 degrees Ni(111) surface. The thermal stability of adsorbed IL layers on Ni(111) and on a fully oxidised Ni(111) surface was studied by heating the layers to elevated temperatures. For clean Ni(111) reversible adsorption takes place. For the oxidised surface, however, only cation-related moieties desorb, starting at similar to 450 K, while anion-related signals remain on the surface up to much higher temperatures.
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