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Journal of Nanomaterials
Volume 2013 (2013), Article ID 425071, 10 pages
Research Article

Effects of Ar or O2 Gas Bubbling for Shape, Size, and Composition Changes in Silver-Gold Alloy Nanoparticles Prepared from Galvanic Replacement Reaction

1Department of Agronomy and Agricultural Extension, Rajshahi University, Rajshahi 6205, Bangladesh
2Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga 816-8580, Japan

Received 13 June 2013; Accepted 15 August 2013

Academic Editor: Shuangxi Xing

Copyright © 2013 Md. Jahangir Alam and Masaharu Tsuji. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The galvanic replacement reaction between silver nanostructures and solution has recently been demonstrated as a versatile method for generating metal nanostructures with hollow interiors. Here we describe the results of a systematic study detailing the morphological, structural, compositional, and spectral changes involved in such a heterogeneous reaction on the nanoscale. Effects of Ar or O2 gas bubbling for the formation of Ag-Au alloy nanoparticles by the galvanic replacement between spherical Ag nanoparticles and especially were studied in ethylene glycol (EG) at C. The shape, size, and composition changes occur rapidly under O2 bubbling in comparison with those under Ar bubbling. The major product after 60 min heating under Ar gas bubbling was perforated Ag-Au alloy particles formed by the replacement reaction and the minor product was ribbon-type particles produced from splitting off some perforated particles. On the other hand, the major product after 60 min heating under O2 gas bubbling was ribbon-type particles. In addition, small spherical Ag particles are produced. They are formed through rereduction of Ag+ ions released from the replacement reaction and oxidative etching of Ag nanoparticles by O2/Cl in EG.