Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.1: Poster

Mittwoch, 16. März 2011, 17:30–21:00, P4

Investigation of the growth of thin Ionic Liquid films on Au(111) and HOPG — •Marcel Marschewski¹, Evgenij Pachomov¹, Oliver Höfft², Wolfgang Maus-Friedrichs¹, and Frank Endres² — ¹Institut für Energieforschung und Physikalische Technologien, TU Clausthal, Leibnizstr. 4, 38678 Clausthal-Zellerfeld, Germany — ²Institut für Mechanische Verfahrenstechnik, TU Clausthal, Arnold-Sommerfeld-Str. 6, 38678 Clausthal-Zellerfeld, Germany

Ionic liquids (IL) are a highly interesting group of solvents for electrochemical processes; mainly due to the combination of their high electrical conductivity, their electrochemical stability and their ability to dissolve a wide range of compounds [1]. Due to the low vapour pressure ionic liquids can be used in ultra high vacuum. We present our results on the growth of thin films imidazolium - based ionic liquids on Au(111) and HOPG. These were studied by electron spectroscopy using ultraviolet photoelectron spectroscopy (UPS, HeI) and metastable atom induced electron spectroscopy (MIES). We have prepared monolayers of [RMIm]Tf2N; (R stands for Ethyl- and Octyl-chains) on the substrates by vapour deposition. For Au(111) we find hints for a reorientation of [OMIm] cation during the growth of the first two monolayers. In addition we have investigated the behaviour of evaporated silver on [EMIm]Tf2N monolayers on HOPG. We find that due to the ionic liquid films the silver particles size is increased compared to silver on clean HOPG. [1] F. Endres, S. Zein El Abedin, Phys. Chem. Chem. Phys., 8 (2006) 2101