Size effect of Au seeds on structure of Au-Pt bimetallic nanoparticles

摘要

Au-Pt bimetallic nanoparticles (NPs) were synthesized by a seeded growth method. Au NPs with different sizes were obtained by reducing HAuCl_4 with butyllithium, and AuPt bimetallic NPs were synthesized by reducing H_2PtCl_6 with oleylamine using the pre-synthesized Au NPs as seeds. The size of Au seeds was found to be a key factor on the structure of Au-Pt bimetallic NPs. Using big AuNP seeds (8 nmor 12 nm) resulted in the formation of Au-Pt dendritic structures. While relatively small Au NPs (3 nm) were used as seeds, the fast atomic diffusion inside relatively small bimetallic NPs will result in an Au-Pt alloy formation.