Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 286, Issue 1, Pages 187-194Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2005.01.013
Keywords
magnetite nanoparticles; tunable gold and silver shell; glucose; micelles
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Fe3O4 nanoparticles with size similar to 13 nm have been prepared successfully in aqueous micellar medium at similar to 80 degrees C. To make Fe3O4 nanoparticles resistant to surface poisoning a new route is developed for coating Fe3O4 nanoparticles with noble metals such as gold or silver as shell. The shell thickness of the core-shell particles becomes tunable through the adjustment of the ratio of the constituents. Thus, the route yields well-defined core-shell structures of size from 18 to 30 nm with varying proportion of Fe3O4 to the noble metal precursor salts. These magnetic nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), MR, differential scanning calorimetry (DSC), Raman and temperature-dependent magnetic studies. (c) 2005 Elsevier Inc. All rights reserved.
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