功能性CdTe纳米晶的合成及自组装膜的发光性质

Preparation and Optical Properties of Functional ized CdTe Nanocrystals and Self-Assembled Films

以巯基乙酸为稳定剂和修饰剂,采用湿化学法合成了功能性CdTe纳米晶;用X射线衍射(XRD)、选区电子衍射(SAED)和高分辨透射电镜(HRTEM)表征其粒度和形貌,制得的CdTe为立方单晶,近似呈球形,分散性较好,粒径约40-70nm;通过CdTe纳米晶与阳离子聚电解质聚二烯丙基二甲基氯化铵(PDDA)之间的静电相互作用,在石英基片表面通过静电自组装方法制备了多层CdTe纳米晶薄膜,以荧光分光光度计、UV-Vis和场发射扫描电子显微镜(SEM)测试手段对所得的CdTe纳米晶薄膜进行了表征;结果表明:所得CdTe-PDDA复合膜组装有序,分布均匀,该复合膜的荧光强度随着组装层数的增加而呈线性增强,具有良好的光致发光性,在554nm附近有绿色荧光发射。

CdTe, a functionalized nanocrystal was synthesized with thioglycollic acid as a stabilizer by a wet chemical method. The particle size and morphology were characterized by XRD, SAED and high resolution transmission electron microscope （HRTEM）. The prepared CdTe nanocrystal was globular shape with the particle diameter between 40nm to 70nm. The related CdTe-CH2COO^-/PDDA complex pellicle was synthesized by static self-assembled. The film forming process was observed by UV--Vis absorption spectra, fluorescence emission spectra and SEM. The complex film has good photoluminescence ability and has an green fluorescence-emission at 554nm. The fluorescence intensity of the film linearly increased while the number of layers increased.