Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)
O 41.104: Poster
Dienstag, 23. März 2010, 18:30–21:00, Poster B1
Surface electronic structure of imidazolium-based ionic liquid films on Au(111)/Mica — •Marcel Marschewski1, Tomonori Ikari2,3,4, Angela Keppler3, Oliver Höfft4, Markus Reinmöller3, Wichard J. D. Beenken3, Wolfgang Maus-Friedrichs1, Stefan Krischok3, and Frank Endres4 — 1Institut für Physik und Physikalische Technologien, TU Clausthal, Leibnizstr. 4, 38678 Clausthal-Zellerfeld — 2Ube National College of Technology, Department of Electrical Engineering 2-14-1 Tokiwadai, Ube, Yamaguchi 755-8555, Japan — 3Institut für Physik and Institut für Mikro- und Nanotechnologien der TU Ilmenau, P.O. Box 100565, 98684 Ilmenau — 4Institute of Particle Technology, TU Clausthal, Arnold-Sommerfeld-Str. 6, 38678 Clausthal-Zellerfeld
Room temperature Ionic Liquids (RT-ILs) are a class of materials, which has recently gained enormous interest. Here we present our results for the surface electronic structure of very thin imidazolium-based ionic liquid (ILs) films on Au(111)/Mica and thick IL films. This was studied by electron spectroscopy using ultraviolet photoelectron spectroscopy (UPS, HeI and HeII) and metastable induced electron spectroscopy (MIES). We have prepared monolayers of four different types of imidazolium-based ILs ([RMIm]Tf2N; R stands for Ethyl-, Butyl-, Hexyl- and Octyl-chains) on Au(111)/Mica by vapour deposition. By comparing these results with our data for the thick IL films we find evidence for ordered growth of the ILs in the monolayer regime. For better understanding of the electronic structure of the ILs, we compare the experimental data with corresponding DFT calculations.