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Synthesis of gold-coated iron oxide nanoparticles

2010; Elsevier BV; Volume: 356; Issue: 25-27 Linguagem: Inglês

10.1016/j.jnoncrysol.2010.04.022

1873-4812

E. Iglesias-Silva, José Luis Vilas‐Vilela, M. Arturo López‐Quintela, J. Rivas, Miguel Á. Rodríguez, L. M. León,

Nanoparticle-Based Drug Delivery

A microemulsion method has been used for the synthesis of iron oxide nanoparticles and its aqueous stabilization. Iron oxide nanoparticles of 9±2 nm in size were then coated with gold in a second step. For this purpose HAuCl4 was reduced employing glucose as a reducing agent. The mild conditions promote the reduction of Au ions adsorbed onto the γ-Fe2O3 particles in order to ensure a controlled shell growth of gold, and avoiding the formation of new gold nuclei. Different molar ratios of HAuCl4/glucose were investigated. The obtained core–shell structures have been characterized by TEM, UV spectroscopy, XRD and Magnetometry measurements.