Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Poster: Colloids and Complex Liquids

CPP 16.32: Poster

Tuesday, March 27, 2012, 18:15–20:45, Poster A

Electron spectroscopy study of the interaction of copper with [EMIm]Tf₂N under the influence of aerobic conditions — •André Zühlsdorff, Angela Ulbrich, Markus Reinmöller, Wichard J. D. Beenken, and Stefan Krischok — Institut für Physik and Institut für Mikro- und Nanotechnologien, TU Ilmenau, PF 100565, 98684 Ilmenau, Germany

The interest of Cu/Ionic Liquid (IL) systems is motivated by the possibility to produce Cu nanoparticles as well as the great potential for catalytic processes. A detailed knowledge of the electronic structure of the Cu/IL system and the behaviour under environmental conditions is therefore important. Due to the low vapour pressure of ILs it is possible to analyse their properties under ultra high vacuum (UHV) conditions. In the present study copper was deposited onto [EMIm]Tf₂N by electron beam evaporation. Afterwards the influence of copper on the surface electronic structure of [EMIm]Tf₂N was investigated by X-ray photoelectron spectroscopy (XPS). An enrichment of copper at the edge of the liquid film was observed. The storage of the Cu/IL system under aerobic conditions for several days leads to a formation of Cu²⁺ species. Additionally, a modification of the near surface chemical composition was found and will be discussed. By comparing the copper containing IL with the neat [EMIm]Tf₂N a modification of the valence band structure was observed. The reconstruction of the photoelectron spectra by density functional theory (DFT) gives decent hints to the origin of these additional valence band structures.