Issue 10, 2012
From the journal:

CrystEngComm

Syntheses of Au–Cu-rich AuAg(AgCl)Cu alloy and Ag–Cu-rich AuAgCu@Cu core–shell and AuAgCu alloy nanoparticles using a polyol method†

Masaharu Tsuji,*ab   Mika Matsunaga,a   Toshitaka Ishizakic  and  Takamasa Nonakac  

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

c Toyota Central R & D Labs, Inc., Nagakute, Aichi 480-1192, Japan

Abstract

Core–shell and alloy types of nanoparticles including Au, Ag, and Cu components were prepared by reducing mixtures of HAuCl4·4H2O, AgNO3, and Cu(OAc)2·H2O in ethylene glycol (EG) in the presence of poly(vinylpyrrolidone) (PVP) at 175 °C. At a HAuCl4·4H2O : AgNO3 : Cu(OAc)2·H2O molar ratio of 1 : 2 : 1, mixtures of Au–Cu-rich AuAg(AgCl)Cu alloy nanoparticles and AgCl precipitates were formed after 2.5–35 min heating. On the other hand, at a HAuCl4·4H2O : AgNO3 : Cu(OAc)2·H2O molar ratio of 0.0065 : 2 : 1, at which the formation of AgCl precipitate was suppressed, Ag–Cu-rich AuAgCu alloy particles were prepared via AuAgCu@Cu core–shell particles after 2.5–34 min heating. The growth mechanisms of AuAg(AgCl)Cu, AuAgCu@Cu, and AuAgCu particles were examined using TEM-energy dispersed X-ray spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-ray absorption near edge structure (XANES), and ultraviolet (UV)-visible (Vis)-near infrared (NIR) extinction spectral data. The time dependence of UV-Vis-NIR spectral data indicated that the Cu components of AuAg(AgCl)Cu and AuAgCu alloy particles retained good anti-oxidation properties about 1 month after preparation.

Graphical abstract: Syntheses of Au–Cu-rich AuAg(AgCl)Cu alloy and Ag–Cu-rich AuAgCu@Cu core–shell and AuAgCu alloy nanoparticles using a polyol method

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Article information

DOI
https://doi.org/10.1039/C2CE06119H
Article type
Paper
Submitted
31 Aug 2011
Accepted
08 Feb 2012
First published
15 Mar 2012

CrystEngComm, 2012,14, 3623-3632

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Syntheses of Au–Cu-rich AuAg(AgCl)Cu alloy and Ag–Cu-rich AuAgCu@Cu core–shell and AuAgCu alloy nanoparticles using a polyol method

M. Tsuji, M. Matsunaga, T. Ishizaki and T. Nonaka, CrystEngComm, 2012, 14, 3623 DOI: 10.1039/C2CE06119H

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