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A method for the two-step synthesis of magnetic composites with a γ-Fe2O3 core, silica inner layer and numerous gold nanoparticles supported on the surface of the silica (γ-Fe2O3/SiO2/Au) is described. First, thiol-functionalized γ-Fe2O3/SiO2 composites and gold colloids are prepared by modifying γ-Fe2O3/SiO2 composites with mercaptosilane and reduction of Au3+ to Au0 with citrate, respectively. Gold...
Micrometer-sized Fe3O4 particles and nano-sized gold particles were first synthesized by methods of self-aggregation of surface-chemically modified Fe3O4 nanoparticles and citrate reduction of the Au3+ to Au0, respectively. Interaction between these two types of particles resulted in the assembly of nano-sized gold particles on the surface of the micrometer-sized Fe3O4 particles, forming an assembled...
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