Regensburg 2010 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 44: Liquids and Ionic Liquids
CPP 44.3: Talk
Thursday, March 25, 2010, 10:15–10:30, H45
Changes of the surface electronic structure of [EMIm]Tf2N room temperature ionic liquid induced by copper ions — •Angela Keppler1, Tomonori Ikari1,2,3, Oliver Höfft2, Markus Reinmöller1, Wichard J. D. Beenken1, Frank Endres2, and Stefan Krischok1 — 1Institut für Physik and Institut für Mikro- und Nanotechnologien, TU Ilmenau, P.O. Box 100565, 98684 Ilmenau, Germany — 2Institut für Mechanische Verfahrenstechnik, TU Clausthal, Arnold-Sommerfeld-Str. 6, 38678 Clausthal-Zellerfeld, Germany — 3Ube National College of Technology, Department of Electrical Engineering, 2-14-1 Tokiwadai, Ube, Yamaguchi 755-8555, Japan
The influence of Cu on the surface electronic structure of [EMIm]Tf2N is investigated using photoelectron spectroscopy. Cu+ ions are electrochemically dissolved in [EMIm]Tf2N. An enrichment of Cu in the near surface region of [EMIm]Tf2N is obtained in XPS results. By comparing the copper containing IL with the neat [EMIm]Tf2N a modification of the near surface chemical composition is found. The Cu induced change of the cation/anion ratio directly correlates with the amount of Cu detected by XPS. Additionally, this modifies the valence band structure, which was analysed by XPS and UPS. This modification throws some light on the origin of certain valence band structures and will be discussed on the basis of new DFT calculations. The results will be compared with available data obtained in additional experiments like Cu deposited on the liquid directly under UHV conditions and with data from other ionic liquids ([BMP]Tf2N and [BMIm]dca).