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Bimetallic Au@Pd-Au Tadpole-Shaped asymmetric nanostructures by a combination of precursor reduction and Ostwald ripening

Grant number: 16/09589-5
Support type:Regular Research Grants - Publications - Scientific article
Duration: July 01, 2016 - December 31, 2016
Field of knowledge:Physical Sciences and Mathematics - Chemistry
Principal Investigator:Pedro Henrique Cury Camargo
Grantee:Pedro Henrique Cury Camargo
Home Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

Bimetallic and asymmetric heterostructures represent an emerging class of nanomaterials. They allow for the combination of distinct compositions, shapes, and physicochemical features within a single particle, thus leading to intriguing properties. We demonstrate herein the synthesis of asymmetric Au@Pd-Au tadpoles having a tail comprised of a single Au nanorod and a spherical head composed of core@shell Au@Pd decorated with small Au NPs. This material was produced by a combination of Au deposition and Ostwald ripening at the surface of Au@Pd core-shell NPs. The overall morphology could be tailored both by controlling the amount of AuCl4- employed as precursor and by altering the reaction time, leading to shape-dependent optical and catalytic properties. We believe that these results may have important implications for the synthesis nanomaterials having novel morphologies and complex functionalities that may combine properties from their different components. (AU)