Solid-State Conversion Chemistry of Multicomponent Nanocrystals Cast in a Hollow Silica Nanosphere: Morphology-Controlled Syntheses of Hybrid Nanocrystals

During thermal transformation of multicomponent nanocrystals in a silica nanosphere, FeAuPd alloy nanocrystals migrate outward and thereby leave a cavity in the silica matrix. Oxidation then converts these nanocrystals back into phase-segregated hybrid nanocrystals, AuPd@Fe3O4, with various morpholo...

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Published inACS nano Vol. 9; no. 11; pp. 10719 - 10728
Main Authors Kim, Yeon Jun, Choi, Jung Kyu, Lee, Dong-Gyu, Baek, Kyungjoon, Oh, Sang Ho, Lee, In Su
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 24.11.2015
Subjects
nanoparticles
solid-state reactions
nanostructures
nanoreactor
hollow nanoparticle
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Summary:During thermal transformation of multicomponent nanocrystals in a silica nanosphere, FeAuPd alloy nanocrystals migrate outward and thereby leave a cavity in the silica matrix. Oxidation then converts these nanocrystals back into phase-segregated hybrid nanocrystals, AuPd@Fe3O4, with various morphologies. The FeAuPd-to-AuPd@Fe3O4 transformation was cast by the in situ generated hollow silica mold. Therefore, the morphological parameters of the transformed AuPd@Fe3O4 are defined by the degree of migration of the FeAuPd in the hollow silica nanoshell. This hollow silica-cast nanocrystal conversion was studied to develop a solid state protocol that can be used to produce a range of hybrid nanocrystals and that allows for systematic and sophisticated control of the resulting morphologies.
ISSN:1936-0851
1936-086X
DOI:10.1021/acsnano.5b05860