Physics – Condensed Matter – Materials Science
Scientific paper
2005-12-16
Chem. Mater. 18, 960-967 (2006).
Physics
Condensed Matter
Materials Science
31 pages, 1 table, 8 figures, to appear in Chemistry of Materials
Scientific paper
10.1021/cm0522073
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 Moessbauer spectral studies. The powder x-ray diffraction patterns reveal both the presence of crystalline alpha-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 Moessbauer 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 alpha-iron and the unexpected amorphous Fe1-xBx 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 that had been believed.
Cho Sung-Jin
Davies Joseph E.
Grandjean Fernande
Kauzlarich Susan M.
Liu Kaijian
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