Formation of bimetallic core-shell nanowires along vortices in superfluid He nanodroplets

Philipp Thaler, Alexander Volk, Florian Lackner, Johannes Steurer, Daniel Knez, Werner Grogger, Ferdinand Hofer, and Wolfgang E. Ernst
Phys. Rev. B 90, 155442 – Published 23 October 2014

Abstract

We report on the formation of one-dimensional Au/Ag core-shell nanostructures in superfluid helium nanodroplets (HeN) and their subsequent surface deposition under soft landing conditions. In vortex charged HeN, dopant atoms and clusters prefer to agglomerate along vortex cores, which serve as personal cryo-templates for each nanowire. A sequential pickup scheme enables the fabrication of Au/Ag structures with either Au as core and Ag as shell or vice versa. The core-shell structure is in both cases shown by energy-dispersive x-ray spectroscopy (EDX) in a scanning transmission electron microscope (STEM). The inherent spatial resolution and element sensitivity of this method allows a direct observation of the two different phases. High resolution STEM studies elucidate morphological details of the Au/Ag nanostructures and, together with the EDX analysis, indicate that the nanowires are formed in a multicenter aggregation process.

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  • Received 3 June 2014
  • Revised 7 October 2014

DOI:https://doi.org/10.1103/PhysRevB.90.155442

©2014 American Physical Society

Authors & Affiliations

Philipp Thaler1, Alexander Volk1, Florian Lackner1, Johannes Steurer1, Daniel Knez2, Werner Grogger2, Ferdinand Hofer2, and Wolfgang E. Ernst1,*

  • 1Institute of Experimental Physics, TU Graz, Petersgasse 16, A-8010 Graz, Austria
  • 2Institute for Electron Microscopy and Nanoanalysis & Graz Centre for Electron Microscopy, TU Graz, Steyrergasse 17, A-8010 Graz, Austria

  • *wolfgang.ernst@tugraz.at

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Vol. 90, Iss. 15 — 15 October 2014

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