Synthesis of Cu core Ag shell nanoparticles using chemical reduction method

A simple chemical reduction method is used to prepare colloidal bimetallic Cu-Ag core-shell (Cu@Ag) nanoparticles. Polyvinyl pyrrolidone (PVP) was used as capping agent, and ascorbic acid (C6H8O6) and sodium borohydride (NaBH4) were used as reducing agents. The obtained Cu@Ag nanoparticles were characterized by powder x-ray diffraction (XRD), transmission electron microscopy (TEM) and UV-vis spectrophotometry. The influence of [Ag]/[Cu] molar ratios on the formation of Ag coatings on the Cu particles was investigated. From the TEM results we found that the ratio [Ag+]/[Cu2+] = 0.2 is the best for the stability of Cu@Ag nanoparticles with an average size of 22 nm. It is also found out that adding ammonium hydroxide (NH4OH) makes the obtained Cu@Ag nanoparticles more stable over time when pure deionized water is used as solvent.

Title:	Synthesis of Cu core Ag shell nanoparticles using chemical reduction method
Authors:	Trinh, Dung Chinh Dang, Thi My Dung Huynh, Kim Khanh Blanc, Eric Fribourg Dang, Mau Chien
Keywords:	Silver;Cu@Ag nanoparticles;Core-shell structure;Copper;Bimetallic
Issue Date:	2015
Publisher:	Institute of Physics Publishing
Citation:	Scopus
Abstract:	A simple chemical reduction method is used to prepare colloidal bimetallic Cu-Ag core-shell (Cu@Ag) nanoparticles. Polyvinyl pyrrolidone (PVP) was used as capping agent, and ascorbic acid (C6H8O6) and sodium borohydride (NaBH4) were used as reducing agents. The obtained Cu@Ag nanoparticles were characterized by powder x-ray diffraction (XRD), transmission electron microscopy (TEM) and UV-vis spectrophotometry. The influence of [Ag]/[Cu] molar ratios on the formation of Ag coatings on the Cu particles was investigated. From the TEM results we found that the ratio [Ag+]/[Cu2+] = 0.2 is the best for the stability of Cu@Ag nanoparticles with an average size of 22 nm. It is also found out that adding ammonium hydroxide (NH4OH) makes the obtained Cu@Ag nanoparticles more stable over time when pure deionized water is used as solvent.
Description:	Advances in Natural Sciences: Nanoscience and Nanotechnology, Volume 6, Issue 2, 1 June 2015, Article number 025018
URI:	http://iopscience.iop.org/article/10.1088/2043-6262/6/2/025018/meta;jsessionid=2E0EBEA9ACEAEAD01668B4BEB77C397F.c2.iopscience.cld.iop.org http://repository.vnu.edu.vn/handle/VNU_123/32312
ISSN:	20436262
Appears in Collections:	Bài báo của ĐHQGHN trong Scopus