Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)
O 58.6: Poster
Mittwoch, 13. März 2013, 18:15–21:45, Poster B1
Growth of imidazolium-based ionic liquid films on gold at low temperatures — Marcel Marschewski1, Cornelia Kunz1, •Oliver Höfft2, Wolfgang Maus-Friedrichs1, and Frank Endres2 — 1Institut für Energieforschung und Physikalische Technologien, TU Clausthal, Leibnizstr. 4, 38678 Clausthal-Zellerfeld, Germany — 2Institut für Elektrochemie, TU Clausthal, Arnold-Sommerfeld-Str.6, 38678 Clausthal-Zellerfeld, Germany
Room temperature Ionic Liquids (RT-ILs) are a class of materials, which has recently gained enormous interest. Due to their exciting combination of properties they are of interest for numerous applications. Here we present our results for the growth of monolayers of imidazolium-based ionic liquid (ILs) films on gold at low temperatures. This was studied by electron spectroscopy using ultraviolet photoelectron spectroscopy (UPS, HeI) and metastable induced electron spectroscopy (MIES). We have prepared monolayers of 1-octyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide ([OMIm]Tf2N) on gold by vapour deposition at 140K. In contrast to the preparation of the monolayers at room temperature we observe an ordered growth of [OMIm]Tf2N beyond the first monolayer. Heating up to room temperature, results in the formation of a disordered film. In addition we present the interaction of cesium with thin films of imidazolium based ILs. Here we will focus on the solvation of cesium in these ionic liquid films. For the IL monolayers, grown on Si(100), we find a shift of the IL valence band states to higher binding energies during Cs adsorption.