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    Chemisorption of alkyl thiols and S-alkyl thiosulfates on Pt(111) and polycrystalline platinum surfaces

    Year: 2005

    Journal: Surface Science 584 (2005) 83-89, 20111221

    Authors: T. Laiho, J. Lukkari, M. Meretoja, K. Laajalehto, J. Kankare, J.A. Leiro

    Organizations: Laboratory of Materials Science, Department of Physics, University of Turku, Fin-20014 Turku, Finland; Department of Chemistry, University of Turku, Fin-20014 Turku, Finland

    The self-assembled monolayers prepared from 1-dodecanethiol (C12SH) or S-dodecylthiosulfate (Bunte salt, C12SSO3Na) have been characterised on polycrystalline gold and platinum surfaces and on Pt(111). Contact angle and impedance measurements show that the film quality decreases in the order Au/C12SH > Pt/C12SH ~ Au/C12SSO3- Na > Pt/C12SSO3Na. XPS measurements show that the S-SO3 bond of organic thiosulfates is broken on platinum surfaces and the state of the surface-bound sulfur is indistinguishable from that of thiolate. On platinum three sulfur species are formed upon SAM formation and we suggest that the catalytic activity of platinum is responsible for their existence in pristine monolayers.