Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 49: Poster: Nanostructures on Surfaces I
O 49.16: Poster
Tuesday, March 13, 2018, 18:15–20:30, Poster A
Silver clusters in ionic liquids of different viscosity - stabilisation and aggregation — •Philippe Poulet, Florian Lippert, Alexander Kononov, Stefanie Roese, and Heinz Hövel — Fakultät Physik/DELTA, Technische Universität Dortmund, 44227 Dortmund, Germany
Due to their low vapor-pressure, enabling cluster deposition to liquids, Ionic Liquids (IL) gained interest for vacuum application [1]. Due to the relativly high viscosity of the IL at low temperature the aggregation of deposited clusters is significantly slowed down and the clusters stay separated. However, during cluster deposition a high viscosity hinders the mixing of the clusters into the volume of the IL.
For ILs with high viscosity Ag-clusters are deposited by temperatures higher than room-temperature to decrease the viscosity of the ILs and the temperature is decreased afterwards for storage. Via UV/vis-spectroscopy the aggregation of clusters is measured in-situ and ex-situ for different storage-temperatures.
Therefore the refractive indices depending on the wavelength are measured via Fabry-Pérot-Interferometry for the ILs [BMIM] [PF6], [BMIM] [BF4], [BMIM] [TF2N], [BMIM] [DCA], [OMIM] [BF6] and [EMIM] [FAP].
Additionally the temperatures for the glass transition of the above mentioned ILs are determined by measuring transmission.
[1] D. C. Engemann, S. Roese, H. Hövel, J. Phys. Chem. C 120, 6239, (2016)