Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 76: Organic, Polymeric, Biomolecular Films - also with Adsorbates
O 76.9: Vortrag
Donnerstag, 28. Februar 2008, 17:15–17:30, MA 043
Preparation and Surface Characterisation of Thermally Deposited Ultrathin Ionic Liquid Films — •Till Cremer1, Manuela Killian1, Claudia Kolbeck1, J. Michael Gottfried1, Peter Wasserscheid2, Florian Maier1, and Hans-Peter Steinrück1 — 1Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen — 2Lehrstuhl für Chemische Reaktionstechnik, Universität Erlangen
Due to their unique physico-chemical properties, ionic liquids (ILs) are promising candidates for many applications in electrochemistry, analysis, synthesis, separation and lubrication technology, and in catalysis.
In surface science, ILs open up interesting new possibilities: Since most ILs exhibit negligible vapour pressures at room temperature, various surface science techniques that employ ultra-high vacuum can be applied, enabling detailed investigations of their surface chemical composition and electronic structure. Furthermore, at elevated temperatures, thermal evaporation of ILs takes place, providing a new way for the in-situ preparation of ultrathin IL films on planar substrates.
In an angular dependent photoelectron spectroscopy (XPS) study we investigated imidazolium-based IL films of nanometer thickness, deposited on glass. For 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM]+ [Tf2N]−), we were able to demonstrate that the initial film growth occurs via a bilayer structure, with the [Tf2N]− anions pointing away from the surface while the [EMIM]+ cations are oriented towards the surface.
This work is supported by the DFG through SPP1191.