Wei Wu et al 2007 Nanotechnology 18 145609 doi:10.1088/0957-4484/18/14/145609
Wei Wu1, Quanguo He1,3, Hong Chen1,2, Jianxin Tang1 and Libo Nie1
Show affiliationsAir-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.
81.16.Be Chemical synthesis methods
68.37.Lp Transmission electron microscopy (TEM)
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
Issue 14 (11 April 2007)
Received 29 November 2006, in final form 22 January 2007
Published 6 March 2007
Wei Wu et al 2007 Nanotechnology 18 145609
Jonathan Pumplin et al JHEP07(2002)012
Bergfinnur Durhuus and Thordur Jonsson JHEP10(2004)050
G Ratel et al 2008 Metrologia 45 06006
Y Hino et al 2008 Metrologia 45 06001
G Ratel et al 2008 Metrologia 45 06008
N G Domostroeva and A G Chunovkina 2008 Metrologia 45 07009
Sutirtha Mukhopadhyay et al 2009 New J. Phys. 11 055002
Matej Grum and Lars Nielsen 2008 Metrologia 45 07007
David Seery and James E Lidsey JCAP06(2005)003