Synthesis and growth mechanism of pentagonal bipyramid-shaped gold-rich Au/Ag alloy nanoparticles

Xu Zhang; Masaharu Tsuji; Seongyop Lim; Nobuhiro Miyamae; Michiko Nishio; Sachie Hikino; Mitsutaka Umezu

doi:10.1021/la063662w

Synthesis and growth mechanism of pentagonal bipyramid-shaped gold-rich Au/Ag alloy nanoparticles

Langmuir. 2007 May 22;23(11):6372-6. doi: 10.1021/la063662w. Epub 2007 May 1.

Authors

Xu Zhang¹, Masaharu Tsuji, Seongyop Lim, Nobuhiro Miyamae, Michiko Nishio, Sachie Hikino, Mitsutaka Umezu

Affiliation

¹ Institute for Materials Chemistry and Engineering, Graduate School of Engineering Sciences, and Art, Science and Technology Center for Cooperative Research, Kyushu University, Kasuga 816-8580, Japan.

PMID: 17469858
DOI: 10.1021/la063662w

Abstract

Pentagonal bipyramid-shaped gold-rich Au/Ag alloy nanoparticles are synthesized in ethylene glycol (EG) in the presence of small amounts of AgNO3 and PVP without using Au seeds. The contents of Au and Ag in pentagonal nanobipyramids are determined by energy-dispersive X-ray spectroscopy (EDS). The EDS data demonstrates that this kind of nanoparticles is composed of Au/Ag alloys, not silver monolayers simply covering the surface of Au nanoparticles. Insights into the growth mechanism of pentagonal bipyramid-shaped gold-rich Au/Ag alloy nanoparticles are discussed.