绿色和黄色银胶的光化学制备及其共振散射光谱研究

PHOTOCHEMICAL PREPARATION OF GREEN SILVER AND YELLOW SILVER COLLOID AND THEIR RESONANCE SCATTERING SPECTROSCOPIC STUDY

研究了不同光源、光照时间、反应物浓度等对绿色银胶形成的影响 ,分别制备了绿色银胶和黄色银胶 .透射电镜显示 ,它们的平均粒径分别为 1 0 0nm和 4 0nm .绿色银胶在 393 9nm和 71 3 3nm处有两个吸收峰 ;黄色银胶在 4 1 9 3nm处有一较宽的吸收峰 .它们的最强共振散射峰位于 4 70nm处 ;绿色银胶在 34 0nm和 680nm还有两个小共振峰 .

The green silver colloid and yellow silver colloid were prepared by two?step photochemical procedure and UV photochemical procedure respectively. Their sizes measured by TEM are 100 nm and 40 nm respectively. The green silver solloid exhibits two absorption peaks at 393.9 nm and 713.3 nm , The absorption peak of yellow silver colloid is at 419.3 nm. They have a maxium resonance scattering peak at 470 nm, and the green silver colloid has other two resonance scattering peaks at 340 nm and 680 nm.