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Void Coalescence in Core/Alloy Nanoparticles with Stainless Interfaces
Author(s) -
Wu Wenjie,
Maye Mathew M.
Publication year - 2014
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201301420
Subject(s) - kirkendall effect , materials science , passivation , alloy , microstructure , oxide , coalescence (physics) , void (composites) , nanoparticle , vacancy defect , metallurgy , chemical engineering , composite material , nanotechnology , layer (electronics) , crystallography , chemistry , physics , astrobiology , engineering
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.