硫化镉准纳米圆球的人工活性膜法控制合成及其性能研究

Controlled Synthesis and Properties of CdS Quasi-nanospheres with Artificial Active Membrane as Template

首次利用胶棉人工活性膜模板 ,在 0 1mol/LCdCl2 溶液和 0 1mol/LNa2 S溶液组成的隔膜组装体系中 ,成功制备了硫化镉准纳米圆球 .产物粒径范围 80～ 2 80nm ,平均粒径～ 170nm ,圆球边界清晰 ,为立方闪锌矿多晶结构 ,晶格常数a =0 5 818nm .光学性质研究表明 ,当激发波长为 3 90nm时 ,出现了波长为 480nm的蓝光和 5 3 5nm的绿光两个发射峰 ;紫外 -可见光谱在 475nm处有最大吸收 ,与常规材料相比“蓝移”了 40nm ,表现出明显的量子尺寸效应 .

Quasi-nanospheres of US were successfully synthesized with artificial active membrane of collodion as template. The results indicated that regular US quasi-nanospheres, which had a cubic zinc-blende structure with a cell constant a = 0.5818 nm, could be formed with 0.1 mol/L CdCl2 and 0.1 mol/L Na2S as reactants at room temperature. The sphere diameter range was from 80 to 280 nm, and the average diameter was about 170 nm. When the exciting wavelength was 390 nm, two emission peaks at 480 nm with blue light and at 535 nm with green light appeared. The UV-vis spectrum showed a wider absorption peak at 475 nm, and had 40 nm blue-shift compared with bulky materials, indicating that the particles had obvious quantum size effect. In addition, the reaction mechanism has primarily been explored.