Web Release Date: March 20,
Synthesis of Fe Oxide Core/Au Shell Nanoparticles by Iterative Hydroxylamine Seeding
and
Department of Chemistry, The Pennsylvania State University, 152 Davey Laboratory, University Park, Pennsylvania 16802, and Department of Physics and Materials Research Institute, The Pennsylvania State University, 104 Davey Laboratory, University Park, Pennsylvania 16802
Received December 30, 2003
Revised February 26, 2004
Abstract:
Water-soluble, Au-coated magnetic Fe oxide nanoparticles with diameters ~60 nm were synthesized by the reduction of Au3+ onto the surfaces
of ~9 nm diameter particles consisting of either 
-Fe2O3 or partially oxidized Fe3O4 via iterative hydroxylamine seeding. The morphology and
optical properties of the core/shell particles are dependent on the quantity of deposited Au, while the magnetic properties remain largely
independent of Au addition. The Au-coated particles exhibit a surface plasmon resonance peak that blue-shifts from 570 to 525 nm with
increasing Au deposition. SQUID magnetometry reveals that particle magnetic properties are not affected by the overlayer of a moderately
thick Au shell.
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