Magnetic and mössbauer spectral study of core/shell structured Fe/Au nanoparticles

Sung Jin Cho, Ahmed M. Shahin, Gary J. Long, Joseph E. Davies, Kai Liu, Fernande Grandjean, Susan M. Kauzlarich

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76 Scopus citations


Fe/Au nanoparticles have been chemically synthesized through a reverse micelle reaction and investigated by both conventional and synchrotron-based X-ray diffraction and by magnetic and Mössbauer spectral studies. The powder X-ray diffraction patterns reveal both the presence of crystalline α-iron and gold and the absence of any crystalline iron oxides or other crystalline products. First-order reversal curves, along with the major hysteresis loops of the Fe/Au nanoparticles, have been measured as a function of time in order to investigate the evolution of their magnetic properties. The iron-57 Mössbauer spectra of both uncoated iron nanoparticles and the Fe/Au nanoparticles have been measured at 78 and 295 K and indicate that two major iron-containing components are present, namely, the expected α-iron and the unexpected amorphous Fe 1-xB x alloy; several poorly crystallized ordered iron(III) oxide components as well as paramagnetic iron(II) and iron(III) components are also observed. These results indicate that the Fe-core/Au-shell nanoparticles synthesized through reverse micelles are far more complex than had been believed.

Original languageEnglish (US)
Pages (from-to)960-967
Number of pages8
JournalChemistry of Materials
Issue number4
StatePublished - Feb 21 2006

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)


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