Solid-State Conversion Chemistry of Multicomponent Nanocrystals Cast in a Hollow Silica Nanosphere: Morphology-Controlled Syntheses of Hybrid Nanocrystals
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- 作者：Yeon Jun Kim ; Jung Kyu Choi ; Dong-Gyu Lee ; Kyungjoon Baek ; Sang Ho Oh ; In Su Lee
- 刊名：ACS Nano
- 出版年：2015
- 出版时间：November 24, 2015
- 年：2015
- 卷：9
- 期：11
- 页码：10719-10728
- 全文大小：905K
- ISSN：1936-086X
文摘
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@Fe<sub>3sub>O<sub>4sub>, with various morphologies. The FeAuPd-to-AuPd@Fe<sub>3sub>O<sub>4sub> transformation was cast by the in situ generated hollow silica mold. Therefore, the morphological parameters of the transformed AuPd@Fe<sub>3sub>O<sub>4sub> 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.