SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 60: Solid-Liquid Interfaces I: Structure and Spectroscopy
O 60.6: Vortrag
Mittwoch, 29. März 2023, 16:15–16:30, TRE Phy
Structure and Reactivity of an Ionic Liquid on Cu(111) investigated by Scanning Probe Microscopy, Photoelectron Spectroscopy and Simulations — Rajan Adhikari1, Stephen Massicot1, Lukas Fromm2, •Simon Jaekel1, Timo Talwar1, Afra Gezmis1, Manuel Meusel1, Andreas Bayer1, Florian Maier1, Andreas Görling2, and Hans-Peter Steinrück1 — 1Chair of Physical Chemistry II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany — 2Chair of Theoretical Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
We studied the adsorption and reaction behaviour of the ionic liquid (IL) 1,3-dimethylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([C1C1Im][Tf2N]) on Cu(111) in UHV. Our nc-AFM and STM results show that the IL transitions from an ordered structure observed after annealing at 200 K into a different ordered structure and disordered islands after extended annealing at 300 K. Complementary, ARXPS reveals that the IL initially adsorbs intact and that no IL desorption occurs until 300 K but that a significant fraction of the IL is converted to a new species. We correlate the remaining unshifted peaks to the ordered phases observed in AFM and the shifted peaks to decomposition products, which appear as disordered islands. From DFT, we obtain additional information on the structure of the ordered phases and the interaction of the IL with the substrate.