Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 20: Poster Monday: Solid-Liquid Interfaces

O 20.2: Poster

Montag, 5. September 2022, 18:00–20:00, P4

Film growth and stabilty of the ionic liquid [C1C1Im][Tf2N] on Cu(111) — •Timo Talwar, Stephen Massicot, Florian Maier, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie 2, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen

Ionic liquids (ILs) are salts with melting points below 100^∘C and extremly low vapor pressure. These properties made them promising candidates for various new catalytic concepts like solid catalysis with Ionic Liquid Layer (SCILL). In this context, the interplay of ILs with metal surfaces is highly important.

In this study, the growth and thermal behavior of ultrathin films of 1,3-dimethylimidazolium bis[(trifluoromethyl)sulfonyl]imide [C1C1Im][Tf2N] on Cu(111) are investigated under UHV conditions. The films are prepared in vacuum by physical vapor deposition and measured by angle-resolved and temperature-programmed X-ray photoelectron spectroscopy. Different film thicknesses are investigated to identify the underlying growth model, which is 2D growth up to 0.3 ML and 3D growth for higher coverages. Note that 1 ML corresponds to a bilayer of cations and anions irrespective of their arrangement. These films are stable up to 300 K. However above 300 K, the anion partly decomposes, and above 500 K, the remaining IL desorbs leaving a decomposed residual on the surface.

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