Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 32: Poster: Solid-Liquid Interfaces
O 32.12: Poster
Dienstag, 19. März 2024, 18:00–20:00, Poster C
Temperature-dependent structure formation in the wetting layer of the ionic liquid [C2C1Im][OTf] on Au(111) — •Jonas Hauner1, Hanna Bühlmeyer1, Simon Trzeciak2, Julien Steffen3, Andreas Görling3, Dirk Zahn2, and Jörg Libuda1 — 1Interface Research and Catalysis, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany — 2Computer Chemistry Center, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nägelsbachstraße 25, 91052 Erlangen, Germany — 3Chair of Theoretical Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
We report on in-situ studies on the structure of ultrathin films of the ionic liquid (IL) 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIm][OTf]) on Au(111). The IL thin films were prepared by physical vapor deposition and investigated by scanning tunneling microscopy (STM). We carried out measurements at sample temperatures between 100 K and 350 K on submonolayers and monolayers of [EMIm][OTf]. In this temperature range, we identified three different surface structures. At a submonolayer coverage, [EMIm][OTf] tends to exhibit a 2D-glass structure growing close to gold terraces and the elbows of the herringbone structure of Au(111). Oblique and hexagonal structures of the IL are visible at higher coverage. We investigated the phase transitions and the melting behavior of these wetting layers by temperature dependent STM measurements. Ordered domains are visible above the bulk melting temperature up to 350 K.
Keywords: Scanning Tunneling Microscopy; Ionic liquids; Physical Vapor Deposition; SCILL