Journal
PHYSICAL REVIEW B
Volume 90, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.90.155442
Keywords
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Funding
- Austrian Science Fund (FWF) [P 22962-N20]
- European Commission
- Styrian Government within the ERDF program
- European Union within the 7th Framework Programme (FP7) [312483 (ESTEEM2)]
- Austrian Research Promotion Agency (FFG)
- NAWI Graz
- Austrian Science Fund (FWF) [P 22962] Funding Source: researchfish
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We report on the formation of one-dimensional Au/Ag core-shell nanostructures in superfluid helium nanodroplets (He-N) and their subsequent surface deposition under soft landing conditions. In vortex charged He-N, 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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