Controlled synthesis of Au-Fe heterodimer nanoparticles and their conversion into Au-Fe3O4 heterostructured nanoparticles

Guangming Jiang; Yuxi Huang; Sen Zhang; Huiyuan Zhu; Zhongbiao Wu; Shouheng Sun

doi:10.1039/c6nr06395k

Controlled synthesis of Au-Fe heterodimer nanoparticles and their conversion into Au-Fe₃O₄ heterostructured nanoparticles

Nanoscale. 2016 Oct 20;8(41):17947-17952. doi: 10.1039/c6nr06395k.

Authors

Guangming Jiang¹, Yuxi Huang², Sen Zhang³, Huiyuan Zhu², Zhongbiao Wu⁴, Shouheng Sun²

Affiliations

¹ Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China and Department of Chemistry, Brown University, Providence, RI, 02912, USA. ssun@brown.edu.
² Department of Chemistry, Brown University, Providence, RI, 02912, USA. ssun@brown.edu.
³ Department of Chemistry, University of Virginia, Charlottesville, VA, 22904, USA.
⁴ Department of Environmental Engineering, Zhejiang University, Zhejiang, 310058, China. zbwu@zju.edu.cn.

PMID: 27731449
DOI: 10.1039/c6nr06395k

Abstract

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.