Issue 38, 2013
From the journal:

CrystEngComm

Synthesis and growth mechanism of triangular Ag-rich AgAu alloy prisms in an aqueous solution in the presence of PVP, citrate and H2O2†

Masaharu Tsuji,*abc   Atsuhiko Yajima,b   Mika Hamasaki,d   Masashi Hattori,a   Masahito Mitaraie  and  Hirofumi Kawazumid  

* Corresponding authors

a Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga 816-8580, Japan
E-mail: tsuji@cm.kyushu-u.ac.jp
Fax: +81-092-583-7815
Tel: +81-092-583-7815

b Department of Automotive Science, Graduate School of Integrated Frontier Sciences, Kyushu University, Kasuga, Japan

c Department of Applied Science for Electronics and Materials, Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan

d Department of Biological and Environmental Chemistry, School of Humanity-oriented Science and Technology, Kinki University, Iizuka 820-8555, Japan

e Department of Mechanical and Control Engineering, Tokuyama College of Technology, Shunan 745-8585, Japan

Abstract

The effects of the addition of a small amount of HAuCl4·4H2O in the preparation of triangular Ag prisms from an aqueous AgNO3–NaBH4–polyvinylpyrrolidone (PVP)–trisodium citrate (Na3CA)–H2O2 solution were studied by monitoring time-dependent surface plasmon resonance (SPR) bands in the UV-vis region and by analyzing the data obtained from transmission electron microscopic (TEM) images and TEM-energy dispersed X-ray spectroscopy (EDS). The results show that Ag-rich AgAu alloy triangular prisms are formed by the addition of a small amount of AuCl4− ions. At first, small Au seeds were formed without latent time, along with spherical Ag-rich AgAu alloy particles. Then, a spherical-to-prism (STP) transformation of the AgAu alloy particles occurred. The plasmon band of the AgAu prism shifts slightly to red with the increasing concentration of HAuCl4·4H2O.

Graphical abstract: Synthesis and growth mechanism of triangular Ag-rich AgAu alloy prisms in an aqueous solution in the presence of PVP, citrate and H2O2

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Article information

DOI
https://doi.org/10.1039/C3CE41172A
Article type
Paper
Submitted
18 Jun 2013
Accepted
25 Jul 2013
First published
25 Jul 2013

CrystEngComm, 2013,15, 7688-7695

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Synthesis and growth mechanism of triangular Ag-rich AgAu alloy prisms in an aqueous solution in the presence of PVP, citrate and H2O2

M. Tsuji, A. Yajima, M. Hamasaki, M. Hattori, M. Mitarai and H. Kawazumi, CrystEngComm, 2013, 15, 7688 DOI: 10.1039/C3CE41172A

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