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Synthesis of Au nanoparticles with Bi adlayers using glucose as dispersant

Tian Yanping,Ouyang Lei,Xiao Mingshu,Zhou Hualan

Well-dispersed Au/Bi nanoparticles with average size below 10 nm were prepared by using NaBH 4 to reduce HAuCl 4 with glucose as dispersant. The obtained Au/Bi NPs were well characterized by UV-Vis spectra, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and electrochemical measurements. The electrochemical study found that Bi adlayers on the surface of Au nanoparticles owns two kinds of surface structures, including a low coverage (2 × 2)-Bi adlayer and a close-packed (p × √3)-2 Bi adlayer due to the strong interaction between the two Bi layers and the below Au atoms, which is same with that bulk on Au surface.