期刊
LANGMUIR
卷 27, 期 7, 页码 3662-3671出版社
AMER CHEMICAL SOC
DOI: 10.1021/la105007c
关键词
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资金
- Cluster of Excellence Engineering of Advanced Materials
- [SPP 1191]
Ultrathin films of two imidazolium-based ionic liquids (IL), [C(1)C(1)Im][Tf2N] (= 1,3-dimethylimidazolium bis(trifluoromethyl)imide) and [C(8)C(1)Im][Tf2N] (= 1-methyl-3-octylimidazolium bis(trifluoromethyl)imide) were prepared on a Au(111) single-crystal surface by physical vapor deposition in ultrahigh vacuum. The adsorption behavior, orientation, and growth were monitored via angle-resolved X-ray photoelectron spectroscopy (ARXPS). Coverage-dependent chemical shifts of the IL-derived core levels indicate that for both ILs the first layer is formed from anions and cations directly in contact with the Au surface in a checkerboard arrangement and that for [C(8)C(1)Im][Tf2N] a reorientation of the alkyl chain with increasing coverage is found. For both ILs, geometry models of the first adsorption layer are proposed. For higher coverages, both ILs grow in a layer-by-layer fashion up to thicknesses of at least 9 nm (>10 ML) Moreover, beam damage effects are discussed, which are mainly related to the decomposition of [Tf2N](-) anions directly adsorbed at the gold surface.
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