%A JIN Yi-liang;YAO Jian-lin;GU Ren-ao* %T UV-Vis Studies on the Course of Reaction of Au/Ag Alloy Colloid with Hydrogen Tetrachloroaurate(Ⅲ) Hydrate %0 Journal Article %D 2009 %J SPECTROSCOPY AND SPECTRAL ANALYSIS %R 10.3964/j.issn.1000-0593(2009)10-2815-05 %P 2815-2819 %V 29 %N 10 %U {https://www.gpxygpfx.com/CN/abstract/article_2023.shtml} %8 2009-10-01 %X Using citrate as protector, Au-Ag alloy nanoparticles with different molar ratios were prepared with hydrazine as the reducer. One plasmon band between monometallic Ag and Au was observed in their UV-Vis spectra. And the peak of alloy shifted linearly with the ratio of Au changing in the alloy. By UV-Vis spectra, the course of reaction of the alloy colloid with HAuCl4 was studied. The result shows that the UV-Vis spectra of the alloy colloid changed regularly with the adding volume of HAuCl4 increasing. And there is a linear interval in it with the change in the calculated ratio of Au. With the former studies, the course can be attributed to the dealloy of Au/Ag alloy.