title: Void coalescence in core/alloy nanoparticles with stainless interfaces.
abstract: The oxidation properties of nanoparticles with core/alloy microstructure and stainless steel like interfaces is described. In particular, 15-nm Fe/FeCr nanoparticles with a stainless steel like interface are prepared. These particles show a unique morphological transformation that is induced by surface oxidation, oxide passivation, and vacancy coalescence. This Kirkendall diffusion results in a tailorable oxide layer thickness, Fe-core size, as well as void size and symmetry. Much like the interface of bulk stainless steel, the interfacial FeCr oxide passivates oxidation, resulting in self-limited diffusion. Because of this, a highly uniform and stable core-void-shell morphology is observed.
authors.affiliation: Syracuse University, Department of Chemistry, Syracuse, NY, 13244, USA.
authors.forename: Wenjie
authors.initials: W
authors.lastname: Wu
authors.forename: Mathew M
authors.initials: MM
authors.lastname: Maye
keywords: core-void-shell; core/alloy; kirkendall; stainless; vacancy coalescence