Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 56: Nanostructures: Dots, Particles and Clusters

O 56.7: Vortrag

Mittwoch, 9. März 2016, 12:00–12:15, H4

Silver clusters in room temperature ionic liquids: supersonic nozzle expansion deposition — •Stefanie Roese, David Engemann, Andreas Gruhn, and Heinz Hövel — Fakultät Physik / DELTA, TU Dortmund, Otto-Hahn-Str. 4, 44221 Dortmund, Germany

Promising stabilizers for nanoparticles are room temperature ionic liquids (RTIL), which are salts of weakly coordinating cations and anions being liquid at room temperature [1]. They consist of a large organic cation and a small inorganic anion. The different charges of the molecules cause a strong attractive interaction, while the large difference of size of the molecules prevents condensation at room temperature [2]. Due to their low vapor pressure RTIL can be used under vacuum conditions. BMIM PF6 is one of the most widely studied ionic liquids [3] and is here used for the generation and stabilization of silver nanoparticles.

The investigated silver nanoparticles are formed in a supersonic nozzle expansion [4] and deposited into the RTIL using a rotating cylinder for mixing. The cluster properties are investigated afterwards with UV/Vis absorption measurements, XANES and SAXS. The formation of a cation layer at the cluster surface could be observed.

[1] J. Dupont, J. D. Scholten, Chem. Soc. Rev. 39, 1780 (2010). [2] J. Dupont, Accounts of chemical research 44, 11 (2011). [3] P. Dash and R. W. J. Scott, Chem. Commun. 2009, 812. [4] H. Hövel, et al., Z. Phys. D 42, 203 (1997).