采用溶胶-凝胶浸渍提拉法在石英玻璃片上制备了Ag/TiO2薄膜。为研究不同热处理温度(500,600,700℃)对制备过程的影响,在薄膜的制备过程中其他的条件均不变(钛酸丁酯和硝酸银的摩尔比为1:0.18)。用透射电子显微镜(Transmission Electron Microscope,TEM)记录样品的透射显微镜图像和衍射花样以表征薄膜的结构,用背散射电子(Backscattered Electron,BSE)检测器观察样品表面的组分分布,用能谱EDAX(Energy Dispersive Analysis of X-rays)分析Ag/TiO2薄膜样品的元素成分组成。实验结果表明,500℃热处理时得到了含有尺寸均匀的纳米银粒子的Ag/TiO2膜,随着热处理温度的升高,Ag的颗粒逐渐长大,尺寸分布变得不均匀,同时,膜中的银逐渐向薄膜表面迁移并挥发。
The CdS nanoparticles with good crystallinity were prepared by hydrothermal method in microemulsion composed of poly oxyethylene lauryl ether/water/ cyclohexane/butanol. The structure and the size of the nanoparticles were analyzed by TEM and XRD. The UV-Vis optical absorption of the samples was also investigated.The results show that hydrothermal treatment is an effective method to prepare CdS nanoparticles of hexagonal structure at low temperature. The particles were in dimensional uniformity. The diameter of the nanoparticles decreased with the increase of the molar ratio of water to surfactant. The minimum diameter of the nanoparticles prepared in this work was 10 nm. Obvious blue-shift were observed in the UV-Vis absorption.
