Journal
NANOSCALE
Volume 8, Issue 41, Pages 17947-17952Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr06395k
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Funding
- U.S. Army Research Office [W911NF-15-1-0147]
- National Natural Science Foundation of China [51508055]
- Natural Science Foundation of Chongqing Science & Technology Commission [cstc2016jcyjA0154]
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We report a facile synthesis of Au-Fe heterodimer nanoparticles (NPs) with tunable Au/Fe sizes and their sequential oxidations to Au-Fe3O4 heterostructured NPs with controllable morphologies. The size of Au in Au-Fe heterodimer NPs was tuned to be 4, 7 and 10 nm, while the Fe crystal structure was maintained as single-crystal bcc. Further oxidation of the as-synthesized Au-Fe NPs led to the formation of Au-hollow Fe3O4 yolk-shell, Au-hollow Fe3O4 heterodimer NPs and Au-porous hollow Fe3O4 yolk-shell NPs, depending on the size of the Au-Fe NPs and the oxidation conditions used. Our study has provided not only a variety of bifunctional NPs with tunable surface plasmon absorption and magnetic properties, but also a new general approach to design and synthesize multicomponent NPs with multiple heterostructures.
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