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O: Fachverband Oberflächenphysik

O 8: Poster Session I: Solid-liquid interfaces: Structure, spectroscopy

O 8.1: Poster

Monday, March 1, 2021, 10:30–12:30, P

Interface Composition of Pure and Mixed Ionic Liquid Films on Metal Surfaces — •Stephen Massicot¹, Tomoya Sasaki², Matthias Lexow¹, Sunghwan Shin¹, Florian Maier¹, Susumu Kuwabata², and Hans-Peter Steinrück¹ — ¹Lehrstuhl für Physikalische Chemie 2, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany — ²Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Japan

Ionic liquids (ILs) are salts with melting points below 100°C and extremely low vapor pressure. Thin films of ILs are of utmost interest in potential applications, e.g. in the fields of catalysis and electrochemistry. In this context, we investigate mixed ultrathin films of two ILs on metal surfaces. The molecular composition of the IL/solid and IL/vacuum interfaces is studied by angle-resolved and temperature-programmed X-ray photoelectron spectroscopy on the molecular scale. We observe phenomena of ion exchange and preferential enrichment at the interfaces, and selective desorption which opens pathways for on surface formation of new ILs by metathesis at IL/metal interfaces. In particular, we address mixtures of the protic IL diethylmethylammonium trifluoromethanesulfonate ([dema][TfO]) and the aprotic IL 1-methyl-3-octylimidazolium hexafluorophosphate ([C8C1Im][PF6]).

Supported by the European Research Council (ERC) through an Advanced Investigator Grant (ILID 693398) to HPS.