| 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 |
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| 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。 |
| 关键词: L-半胱氨酸 CdSe CdSe/CdS/ZnS 量子点 |
| 基金项目: |
| Abstract: 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. |
| Keywords: L-cysteine CdSe CdSe/CdS/ZnS quantum dots |
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| 杨芳芳,于俊生,谢 颖.水溶性的CdSe/CdS/ZnS量子点的合成及表征[J].无机化学学报,2008,24(7):1142-1147. |
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