Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.70: Poster
Tuesday, April 1, 2014, 18:30–22:00, P1
Characterization of 1-octyl-3-methyl-imidazolium chloride interfaces with Photoelectron Spectroscopy and Metastable Induced Electron Spectroscopy — •Marcel Marschewski1, Wolfgang Maus-Friedrichs1, Volker Kempter1, Angela Ulbrich2, Stefan Krischok2, Frank Endres3, and Oliver Höfft3 — 1Institut für Energieforschung und Physikalische Technologien, TU Clausthal, 38678 Clausthal-Zellerfeld, Germany — 2Institut für Physik und Institut für Mikro- und Nanotechnologien, TU Ilmenau, 98684 Ilmenau, Germany — 3Institut für Elektrochemie, TU Clausthal, 38678 Clausthal-Zellerfeld, Germany
Room temperature Ionic Liquids are a class of materials, which has recently gained enormous interest. Due to the low vapour pressure ionic liquids interfaces can be investigated with photoelectron spectroscopy (UPS/XPS) and metastable induced electron spectroscopy (MIES). In this study we investigate the liquid solid and liquid vacuum interfaces of 1-octyl-3-methyl-imidazolium chloride ([OMIm]Cl). For the analysis of the solid/liquid interface we have prepared monolayers of [OMIm]Cl on Si(100) by vapour deposition at room temperature. The obtained data are compared with results for the multilayer films. The electron spectra of thick [OMIm]Cl films indicate, that the alkyl chain sticks out of the surface. The chlorine induced feature is not detected in the MIES spectra and the anion seems to be completely buried under the alkyl chain. In the monolayer case, due to the visibility of the chlorine feature in MIES, our results indicate a more flat adsorption of alkyl chains of the cation.