Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 61: Nanostructures at Surfaces III
O 61.1: Vortrag
Mittwoch, 2. April 2014, 16:00–16:15, WIL B321
XANES and UV-Vis measurements on Ag clusters deposited into ionic liquid — •David Engemann1, Stefanie Roese1, Stefanie Duffe1, Kristina Kvashnina2, Pieter Glatzel2, and Heinz Hövel1 — 1Fakultät Physik / Delta, Technische Universität Dortmund, 44227 Dortmund — 2European Synchrotron Radiation Facility (ESRF), 6 Rue Jules Horowitz, BP220, 38043 Grenoble
The properties of silver clusters can differ widely from that of bulk material. These differences correspond to the size of the clusters, their chemical environment and, if deposited, the supporting or embedding material. For applications of clusters for example in medicine their properties must be tuned in or for the presence of liquid environments. Deposition experiments were performed with Room Temperature Ionic Liquids (RTIL) as embedding material for clusters due to their applicability in high vacuum techniques.
Silver was vaporised by a thermal cluster source and cluster were formed by atom collisions in a super sonic expansion nozzle while expanding into a vacuum. The cluster than were deposited into 1-butyl-3-methylimidazolium hexafluorophosphat (BMIM-PF6). This RTIL, an organic salt in liquid state, consists of a big organic cation (BMIM) and a small inorganic anion (PF6). The asymmetry between the cation and the anion prevents the liquid from condensation at room temperature. These systems were investigated with UV-Vis measurements of the cluster plasmon extinction. Also first X-ray Absorption Near Edge Structure (XANES) spectroscopy measurements at the Ag-L2 absorption edge were performed and will be presented.