Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 56: Nanostructures: Dots, Particles and Clusters
O 56.5: Talk
Wednesday, March 9, 2016, 11:30–11:45, H4
Vortex Assisted Growth of Metallic Nanowires in Superfluid Helium Droplets — •Alexander Volk1, Philipp Thaler1, Andreas W. Hauser1, Daniel Knez2, Werner Grogger2, Ferdinand Hofer2, and Wolfgang E. Ernst1 — 1Institute of Experimental Physics, TU Graz, Petersgasse 16, 8010 Graz, Austria — 2Institute for Electron Microscopy and Nanoanalysis, TU Graz, Steyrergasse 17, 8010 Graz, Austria
Helium droplets provide an ideal matrix for the aggregation of tailored metallic nanoclusters and nanowires. The vortex guided growth process of the wires in the superfluid helium environment has not been fully understood yet. Silver represents a special case among the metals studied so far since no continuous wires were detected after surface deposition, which was attributed to some unexplained barrier formation by the helium. We have explored the growth process of silver nanowires in detail and show by high resolution transmission electron microscopy in combination with computer simulations under which conditions continuous nanowires are obtained. These insights enable us to deduce a model for the growth process of these wires inside the helium droplets from comparison of silver and gold nanowire morphologies. It shows further, that the morphologies of the nanowires can be controlled via the doping rates with which the metal atoms are added to the droplets during the synthesis process.