Preparation and Characterization of Fe3O4@Au Nanoparticles Used as Precursor of Ferrofluids
The Fe3O4 magnetic nanoparticles were prepared through co-precipitation of Fe3+ and Fe2+ with ammonium hydroxide. The initially obtained Fe3O4 nanoparticles were then coated by gold in solution of chloroauric acid through connecting of 3-aminopropyropyl thriethoxysilane (3-APTES) and the obtained Fe3O4@Au nanoparticles were further characterized by X-ray photoelectron spectrum (XPS). During the process, the influences of chloroauric acid, reducing agent, coupling agent and nanoparticles of Fe3O4 were studied. The results showed that core-shell structure Fe3O4@Au particles have diameters of about 20nm in size synthesized from sodium citrate as reducing agent with 10.08 emu/g of saturation magnetization.
Yiwang Bao, Li Tian and Jianghong Gong
D. C. Li et al., "Preparation and Characterization of Fe3O4@Au Nanoparticles Used as Precursor of Ferrofluids", Advanced Materials Research, Vol. 177, pp. 415-417, 2011