Synthesis of Platinum Cubes, Polypods, Cuboctahedrons, and

pubs.acs.org/NanoLett

Synthesis of Platinum Cubes, Polypods, Cuboctahedrons, and Raspberries Assisted by Cobalt Nanocrystals Stephanie I. Lim,† Isaac Ojea-Jime´nez,† Miriam Varon,† Eudald Casals,† Jordi Arbiol,‡,§ and Victor Puntes*,†,§ †

Institut Catala` de Nanotecnologia, Barcelona, Spain, ‡ Institut de Cie`ncia de Materials de Barcelona, CSIC, Barcelona, Spain, and § Institut Catala` de Recerca i Estudis Avanc¸ats (ICREA), Barcelona, Spain ABSTRACT The introduction of metallic traces into the synthesis of platinum nanocrystals (Pt NCs) has been investigated as a surfactant-independent means of controlling shape. Various nanocrystal morphologies have been produced without modification of the reaction conditions, composition, and concentration other than the presence of cobalt traces (