Fabrication and Characterization of Iron (II, III) on Positively Charged Gold Nanoparticles with Application for Magnetically Recoverable Catalysis

An aqueous dispersion was prepared by attaching positively charged gold nanoparticles to the surface of poly-sodium-p-styrenesulfonate-modified Fe3O4 nanoparticles. The Fe3O4@positively charged gold nanoparticles offer high monodispersion, stability against aggregation, and high magnetization with uniform size. The Fe3O4@positively charged gold nanoparticles were efficient and recyclable catalysts due to the formation of a positively charged gold layer on the surface of Fe3O4 nanoparticles and were stable in aqueous solution for over forty-eight hours and hence may have a broad range of applications.