Abstract
The adsorption of non-reactive alkanethiols and cyano-terminated thiols possessing the same chain length as well as their mixtures were examined on polycrystalline gold surfaces by angle resolved X-ray photoelectron spectroscopy (ARXPS). The adsorption behavior was investigated based on the chemical shift of the S 2p peak components. Besides the expected bound state of the thiols at the surface, non-bound molecules were detected with an increasing intensity at lower take-off angles. The layer composition does not entirely reflect the solution composition and the degree of adsorption is independent of the solution composition. A preferential adsorption of the methyl-terminated alkanethiol at the polycrystalline gold surface was measured.
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