首页|Synthesis of Fe-core/Au-shell Nanoparticles Under Ambient Pressure

Synthesis of Fe-core/Au-shell Nanoparticles Under Ambient Pressure

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  • NETL
  • NSTL
  • Trans Tech Publications Ltd
Pure metal iron nanoparticles are unstable in the air. By a coating iron on nanoparticle surface with gold, these air-stable nanoparticles are protected from the oxidation and retain most of the favorable magnetic properties. However, it is difficult to prepare Fe-core/Au-shell (Fe@Au) nanoparticles under ambient pressure because iron nanoparticles are very easily to be oxidized in the air. In this study, we synthesized Fe@Au nanoparticles by modified reverse micelle method under ambient pressure and investigated them by X-ray diffraction, transmission electron microscopy (TEM), ultraviolet-visible absorption spectra, and magnetic susceptibility measurements. X-ray diffraction analysis shows that the pattern of iron is hidden under the pattern of gold. TEM image reveals that the core-shell structure is obviously observed and the average size of Fe@Au nanoparticles is about 12 nm, with about 8 nm diameter core and 2 nm shell. The absorption band of the Fe@Au nanoparticles shifts to a longer wavelength and broadens relative to that of the pure gold. The magnetic susceptibility of Fe@Au nanoparticles is measured with a SQUID magnetometer and found to be superparamagnetic with a blocking temperature Tb～25 K.

Fe@Au nanoparticlesmodified reverse micelle methodsuperparamagnetic

Shi-Mian Chao、Teen-Hang Meen、Wen-Ray Chen、Kuen-Hsien Wu、Yu-Sung Liu、Wen-Cheng Tzou、Chien-Jung Huang

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Department of Electrical Engineering, Hsiuping Institute of Technology, Dali City, Taichung 412, Taiwan

Department of Electronic Engineering, National Formosa University, Hu-Wei, Yunlin 632, Taiwan

Department of Electro-Optical Engineering, Southern Taiwan University of Technology, Tainan 710, Taiwan

Department of Applied Physics, National University of Kaohsiung, Nan-Tzu, Kaohsiung 811, Taiwan

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2010

10.4028/www.scientific.net/KEM.434-435.799

Key engineering materials

Key engineering materials

ISSN：1013-9826
年,卷(期)：2010.434/435
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