水溶性的CdSe/CdS/ZnS量子点的合成及表征  

Synthesis and Characterization of Water-soluble CdSe/CdS/ZnS Core-shell Quantum Dots

作　　者：杨芳芳[1] 于俊生[1] 谢颖[1] 

机构地区：[1]南京大学化学化工学院,教育部生命分析化学重点实验室,南京210093

出　　处：《无机化学学报》2008年第7期1142-1147,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金项目(No.20275016);创新研究群体项目(No.20521503);国家留学人员回国项目基金资助

摘　　要：用L-半胱氨酸盐(Cys)作为稳定剂,合成了水溶性的双壳结构的CdSe/CdS/ZnS半导体量子点。吸收光谱和荧光光谱结果表明,双壳结构的CdSe/CdS/ZnS纳米微粒比单一的CdSe核纳米粒子和单核壳结构的CdSe/CdS纳米粒子具有更优异的发光特性。用透射电子显微镜(TEM)、ED、XRD、XPS和FTIR等方法对CdSe核和双壳层的CdSe/CdS/ZnS纳米微粒的结构、分散性及形貌分别进行了表征。The water-soluble CdSe/CdS/ZnS core-shell quantum dots（QDs） have been prepared by using L-cysteine as stabilizer in aqueous phase.The optical properties of CdSe core and the influence of shell CdS and two-shelled CdS/ZnS on the CdSe core were studied by UV-Vis absorption and fluorescence spectroscopy.As compared to the CdSe core,the absorption peaks and the maximum emission wavelengths of CdSe/CdS,CdSe/CdS/ZnS core-shell structure showed a slight redshift.The remarkable emission enhancements in intensity were observed with factors of 3.7,4.5 for CdSe/CdS and CdSe/CdS/ZnS QDs,respectively.TEM,ED and XPS were used to characterize the size,shape and composition of prepared nanoparticles.The results of FTIR show that sulfur and oxygen atom in L-cysteine molecules take part in coordination with metal ions on the surface of the nanoparticles.These results disclose that the as prepared CdSe/CdS/ZnS QDs in this report have the superior chemical stability and favorable photoluminescence properties.

关 键 词：L-半胱氨酸 CDSE CdSe/CdS/ZnS 量子点 

分 类 号：O613.5[理学—无机化学] O614.241[理学—化学]