Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 8: Solid-liquid interfaces: Structure, Spectroscopy I

O 8.8: Vortrag

Montag, 12. März 2018, 12:15–12:30, MA 144

Growth and dynamics of ultrathin ionic liquid layers on metal surfaces — •Matthias Lexow, Bettina Heller, Benjamin May, Radha G. Bhuin, 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 combining in vacuo deposition of ultrathin IL films and angle-resolved X-ray photoelectron spectroscopy. The investigations show how the IL/solid interface forms and how to control the process by modifying the IL or substrate properties on the molecular scale.

Aiming to understand and predict the behaviour of applied catalyst systems, we discuss on the example of imidazolium based ionic liquids the role of the molecular structure in the mechanisms of initial film formation.

M.L., B.M, R.G.B 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 (No. 693398-ILID).