期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 286, 期 2, 页码 602-609出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2005.01.057
关键词
PAMAM dendrimers; hydrolyzed PAMAM dendrimers; dendrimer gold-silver alloy nanocomposite; catalytic reduction of p-nitrophenol
Gold-silver binary nanoparticles, which feed atomic ratios of gold to silver were 3: 1, 1: 1, and 1:3, were prepared. These particles were stabilized by amine-terminated (generation (G) 3.0 and 5.0) and carboxyl-terminated (G 3.5 and 5.5) poly(amidoamine) (PAMAM) dendrimers in water. UV-vis spectra indicate that the particles are not mere physical mixtures of monometallic particles or core/shell type but alloy. According to transmission electron microscope (TEM) observation, the mean diameters of the particles were 7-10 nm for silver particles and 3-4 nm for both gold and alloy particles, respectively. Catalytic activities for reduction of p-nitrophenol were investigated by monitoring the absorbance at 400 nm during the reaction. They were proportional to the feed ratio of gold in the particles and showed a maximum at the ratio of Au:Ag = 3: 1. (c) 2005 Elsevier Inc. All rights reserved.
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