SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 38: Poster: Organic Molecules on Inorganic Substrates II

O 38.2: Poster

Dienstag, 28. März 2023, 18:00–20:00, P2/EG

Film growth and stabilty of the Ionic Liquid [C1C1Im][Tf2N] on Pt(111) — •Timo Talwar, Stephen Massicot, Afra Gezmis, Cynthia Fernández, Leonhard Winter, Florian Maier, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie 2, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen

Solid catalyst with Ionic Liquid Layer (SCILL) is a new catalytic concept using the advantageous properties of Ionic Liquids (ILs) to improve the catalytic performance such as selectivity and long-term stability of a solid catalyst by the coated IL. In this context, extensive knowledge about the IL-metal interface properties is highly desired.

In this study, the growth and thermal behavior of ultrathin films of 1,3-dimethylimidazolium bis[(trifluoromethyl)sulfonyl]imide [C1C1Im][Tf2N] on Pt(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. Complementary information is gained by Scanning Tunneling Microscopy. At 200 K, an intact closed wetting layer can be deposited on Pt(111). The underlying growth mode is 2D up to 0.5 ML (a closed wetting layer) and moderate 3D for higher coverages. At higher temperatures up to 360 K, the IL continuously decomposes leading to desorption of volatile decomposition products. We will compare this behavior to previous results for this IL on the less-reactive Cu(111) and on the non-reactive Au(111) surface.

We acknowledge support by the DFG (SFB 1452 CLINT).