Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 3: Thin Film Characterisation: Structure Analysis and Composition I

DS 3.3: Vortrag

Montag, 20. März 2017, 10:00–10:15, CHE 91

ARXPS study of the growth behaviour of ultrathin ionic liquid layers on metal surfaces — •Matthias Lexow, Benjamin May, Florian Maier, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen

Ionic liquids (IL) are ionic compounds with a relatively low melting point, often even below room temperature. In addition to numerous applications as a solvent or electrolyte, the extremely low vapour pressure of ILs also led to the development of completely new concepts for catalytically active systems. Thin layers of ILs on solid materials are applied e.g. in SCILL (Solid Catalyst with Ionic Liquid Layer) catalysis.

In this context, the structure and composition of the IL/solid interface is studied by our group with angle-resolved X-ray photoelectron spectroscopy (ARXPS). Recently it was shown that by deposition of sub-monolayer amounts of Pd on single-crystalline Au(111) the growth mode of ILs can be switched from three-dimensional to two-dimensional growth, i.e. from non-wetting to wetting behaviour.

Aiming to understand the behaviour of applied catalyst systems containing Ag and Pd, the ARXPS studies are extended to the Ag(111) surface. The results offer possible explanations for the beneficial influence of the IL layer on heterogeneous metal alloy catalysts.

M.L., B.M and H.P.S. thank the European Research Council (ERC) for financial support of this research in the context of an Advanced Investigator Grant to H.P.S.!