Journal
APL MATERIALS
Volume 2, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4866052
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Funding
- US Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
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Using in situ scanning transmission electron microscopy heating experiments, we observed the formation of a 3-dimensional (3D) epitaxial Cu-core and Ag-shell equilibrium structure of a Cu-Ag nanoalloy. The structure was formed during the thermal interaction of Cu(similar to 12 nm) and Ag NPs(similar to 6 nm) at elevated temperatures (150-300 degrees C) by the Ag NPs initially wetting the Cu NP along its {111} surfaces at one or multiple locations forming epitaxial Ag/Cu (111) interfaces, followed by Ag atoms diffusing along the Cu surface. This phenomenon was confirmed through Monte Carlo simulations to be a nanoscale effect related to the large surface-to-volume ratio of the NPs. (C) 2014 Author(s).
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