Equilibrium Cu-Ag nanoalloy structure formation revealed by in situ scanning transmission electron microscopy heating experiments | Zendy

Ping Lu | Zendy; Michael Chandross | Zendy; Timothy J. Boyle | Zendy; Blythe Clark | Zendy; Paul T. Vianco | Zendy

Open Access

Equilibrium Cu-Ag nanoalloy structure formation revealed by in situ scanning transmission electron microscopy heating experiments

Author(s) -

Ping Lu,

Michael Chandross,

Timothy J. Boyle,

Blythe Clark,

Paul T. Vianco

Publication year - 2014

Publication title -

apl materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.571

H-Index - 60

ISSN - 2166-532X

DOI - 10.1063/1.4866052

Subject(s) - materials science , transmission electron microscopy , scanning electron microscope , wetting , copper , in situ , scanning transmission electron microscopy , nanostructure , epitaxy , crystallography , monte carlo method , analytical chemistry (journal) , nanotechnology , composite material , metallurgy , chemistry , organic chemistry , layer (electronics) , chromatography , statistics , mathematics

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(∼12 nm) and Ag NPs(∼6 nm) at elevated temperatures (150–300 °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

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