Jianbo Wu1, Zhenmeng Peng2, and Hong Yang2. (1) Department of Chemical Engineering, University of Rochester, Gavett Hall 206,Department of Chemical Engineering, University of Rochester, Rochester, NY 14627, (2) Chemical Engineering, University of Rochester, Gavett Hall 206,Department of Chemical Engineering, University of Rochester, Rochester, NY 14627
This paper presents several solution phase strategies for shape-controlled synthesis of metal and metal alloy nanostructures. Platinum-based hollow spheres and necklaces are among the interesting morphologies that will be discussed. In this synthesis, cobalt nanoparticles were synthesized by reducing cobalt salts in solution and used as sacrificial templates. We show that these templates can be completely or partially oxidized by platinum-containing ions and form hollow and higher-ordered necklace structures. The as-synthesized necklace nanostructures, presumably formed in situ through the self-assembly, can have an average diameter between 20 and 40 nm and a length of several micrometers. This method can be used to control the composition of the alloys by designing the molar ratios of various metal ions. The method may potentially be extended to the synthesis of other Pt-based alloy nanostructures and scaled up for large scale production.