Sonochemical synthesis, structure and magnetic properties of air-stable Fe3O4/Au
nanoparticles

doi:10.1088/0957-4484/18/14/145609

Sonochemical synthesis, structure and magnetic properties of air-stable Fe₃O₄/Au nanoparticles

Wei Wu et al 2007 Nanotechnology 18 145609 (8pp) doi: 10.1088/0957-4484/18/14/145609

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Wei Wu¹, Quanguo He^1,3, Hong Chen^1,2, Jianxin Tang¹ and Libo Nie¹
¹ Green Packaging and Biological Nanotechnology Laboratory, Hunan University of Technology, Zhuzhou 412008, People's Republic of China
² College of Life Science and Technology, Central South University of Forestry and Technology, Changsha 41004, People's Republic of China
³ Author to whom any correspondence should be addressed
E-mail: hequanguo@163.com

Abstract. Air-stable nanoparticles of Fe₃O₄/Au were prepared via sonolysis of a solution mixture of hydrogen tetrachloroaureate(III) trihydrate (HAuCl₄) and (3-aminopropyl)triethoxysilane (APTES)-coated Fe₃O₄ nanoparticles with further drop-addition of sodium citrate. The Fe₃O₄/Au nanoparticles were characterized by x-ray powder diffraction (XRD), ultraviolet–visible spectroscopy (UV–vis), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), x-ray photoelectron spectroscopy (XPS) and superconducting quantum interference device (SQUID) magnetometry. Nanoparticles of Fe₃O₄/Au obtained under appropriate conditions possess a very high saturation magnetization of about 63 emu g⁻¹ and their average diameter is about 30 nm.

Print publication: Issue 14 (11 April 2007)
Received 29 November 2006, in final form 22 January 2007
Published 6 March 2007

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Sonochemical synthesis, structure and magnetic properties of air-stable Fe₃O₄/Au nanoparticles

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