Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 45: Focus Session: Catalysis at Liquid Interfaces

O 45.8: Vortrag

Mittwoch, 7. September 2022, 17:30–17:45, H4

Mixed Films of protic and non-protic Ionic Liquids on Metal Surfaces – on-surface metathesis on Ag(111) — •Stephen Massicot¹, Tomoya Sasaki², Matthias Lexox¹, Sunghwan Shin¹, Florian Maier¹, Susumu Kuwabata², and Hans-Peter Steinrück¹ — ¹Lehrstuhl für Physikalische Chemie 2, Friedrich-Alexander-Universität Erlangen-Nürnberg — ²Department of Applied Chemistry, Graduate School of Engineering, Osaka University

Ionic liquids (ILs) are salts that are composed of poorly coordinating ions and thus exhibit melting points typically well below 100^∘C. Thin films of ILs are of utmost interest in many applications such as in catalysis and electrochemistry. In this context, we investigate mixed ultrathin films of the protic IL diethylmethylammonium trifluoromethanesulfonate ([dema][TfO]) and the aprotic IL 1-methyl-3-octylimidazolium hexafluorophosphate ([C8C1Im][PF6]) on a Ag(111) surface. The films are prepared by in situ physical vapor deposition in UHV. The molecular composition of the IL/solid and IL/vacuum interfaces is studied by angle-resolved and temperature-programmed X-ray photoelectron spectroscopy. We observe thermally induced phenomena of ion exchange and preferential enrichment at these interfaces. Furthermore, ions desorb selectively which leads to the on-surface formation of a new IL by metathesis at the IL/metal interface.

Supported through an ERC Advanced Investigator Grant (ILID 693398) to HPS and by the DFG through SFB 1452.