Paper Title:
Synthesis of Fe-Core/Au-Shell Nanoparticles under Ambient Pressure
  Abstract

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.

  Info
Periodical
Key Engineering Materials (Volumes 434-435)
Edited by
Wei Pan and Jianghong Gong
Pages
799-802
DOI
10.4028/www.scientific.net/KEM.434-435.799
Citation
S. M. Chao, T. H. Meen, W. R. Chen, K. H. Wu, Y. S. Liu, W. C. Tzou, C. J. Huang, "Synthesis of Fe-Core/Au-Shell Nanoparticles under Ambient Pressure", Key Engineering Materials, Vols. 434-435, pp. 799-802, 2010
Online since
March 2010
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$32.00
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