Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 69: Poster: Solid-Liquid Interfaces
O 69.9: Poster
Wednesday, March 29, 2023, 18:00–20:00, P2/EG
Growth and structure formation of [EMIm][OTf] on Au(111) — Jonas Hauner1, •Hanna Bühlmeyer1, Simon Trzeciak2, Julien Steffen3, Dirk Zahn2, Andreas Görling3, 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
The growth mechanisms of ultrathin ionic liquid (IL) films have recently received considerable attention. We report on in situ studies of 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 various sample temperatures and coverages, and identified three different surface structures. At low coverage, [EMIm][OTf] tends to exhibit a 2D-glass structure growing close to gold terraces and the elbows of the well-known herringbone structure of Au(111). Oblique and hexagonal structures of the IL are visible at higher coverage. With temperature-dependent measurements, possible phase transitions and melting points of [EMIm][OTf] were investigated. Small glass-like islands of IL melt at 190 - 200 K resulting in a mobile phase of 2D liquid/gas. Islands with highly ordered structures are stable up to 300 K.