通过静电作用组装CdSe/PDDA纳米复合膜

Fabrication of Multilayer of CdSe/PDDA Nanocomposite Films Through Electrostatic Interaction

以巯基丙酸为稳定剂,用水相法合成了表面带负电荷的CdSe半导体纳米晶.通过CdSe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,在经过预处理的带负电的石英基片表面组装多层CdSe/PDDA纳米复合膜.透射电镜(TEM)、紫外-可见光谱和荧光光谱研究结果表明,所得CdSe纳米晶粒径分布比较均匀,平均粒径约为5 nm,且具有很高的荧光光致发光性.CdSe/PDDA纳米复合膜的紫外-可见吸收光谱中波长260 nm和400 nm处薄膜的吸光度与组装层数之间呈现良好的线性关系,表明所得的多层CdSe/PDDA纳米复合薄膜的成膜质量和稳定性良好.

Thiol-stabilized CdSe nanocrystals are synthesized in aqueous phase with 3-mercapto- propionic acid as stabilization reagent. Through the electrostatic interaction between the negatively charged CASe nanocrystals and poly （diallyldimethylammonium chloride） （PDDA）, multilayer CdSe/ PDDA nanocomposite films are fabricated by layer-by-layer deposition on the pretreated quartz substrate. The characterization of transmission electron microscopy （TEM）, UV-Vis spectra and photoluminescence spectra show that resultant CdSe nanocrystals have a narrow size distribution with average sizes of about 5 nm and show high luminescence intensity. The linear relationship of absorbency a- gainst the layers of CdSe/PDDA thin films at 260 nm and 400 nm in UV-Vis spectra indicates that multilayer CdSe/PDDA nanocomposite films with good quality are fabricated successfully.