| 水溶性CdTe/CdS纳米晶表面SiO2壳层的反相胶束法包覆 |
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| 引用本文： | 王永,牛书花,张志娟,王海涛,袁春伟,付德刚.水溶性CdTe/CdS纳米晶表面SiO2壳层的反相胶束法包覆[J].化学物理学报,2007,20(6):685-689. |
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| 作者姓名： | 王永 牛书花 张志娟 王海涛 袁春伟 付德刚 |
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| 作者单位： | 东南大学生物电子学国家重点实验室，南京210096,东南大学化学化工学院，南京210096,东南大学生物电子学国家重点实验室，南京210096,东南大学生物电子学国家重点实验室，南京210096,东南大学生物电子学国家重点实验室，南京210096,东南大学生物电子学国家重点实验室，南京210096 |
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| 摘 要： | "提出了一种水相中制备CdTe/CdS核壳结构纳米粒子的方法.用Te粉作为碲源，用Na2S作为硫源，在50 ℃下制备了CdTe/CdS核壳结构纳米粒子. 用紫外可见吸收光谱和荧光光谱分析了CdS壳层对CdTe核的影响. 随CdS壳层厚度的增加，紫外可见吸收光谱和荧光光谱均发生了红移. CdS壳层厚度较薄时，CdTe/CdS纳米晶的荧光强度较CdTe纳米粒子有显著提高；而CdS壳层厚度较厚时，CdTe/CdS纳米晶的荧光强度会逐渐降低. 用反相胶束法在CdTe/CdS核壳结构纳米粒子的表面包被一层SiO2，
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| 关 键 词： | 量子点，荧光，微乳液，SiO2包覆 |
| 收稿时间： | 2007/8/30 0:00:00 |
| 修稿时间： | 2007/8/29 0:00:00 |
Silica Coating of Water-Soluble CdTe/CdS Core-Shell Nanocrystals by Microemulsion Method |
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| Yong Wang,Shu-hua Niu,Zhi-juan Zhang,Hai-tao Wang,Chun-wei Yuan and De-gang Fu.Silica Coating of Water-Soluble CdTe/CdS Core-Shell Nanocrystals by Microemulsion Method[J].Chinese Journal of Chemical Physics,2007,20(6):685-689. |
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| Authors: | Yong Wang Shu-hua Niu Zhi-juan Zhang Hai-tao Wang Chun-wei Yuan and De-gang Fu |
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| Institution: | State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China,College of Chemistry and Chemical Engineering, Southeast University, Nanjing 210096, China,State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China,State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China,State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China,State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China |
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| Abstract: | "Using Te powder as a tellurium source and Na2S as a sulfur source, core-shell CdTe/CdS NPs were synthesized at 50 oC. UV-visible and photoluminescence (PL) spectra were used to probe the effect of CdS passivation on the CdTe quantum dots. As the thickness of CdS shell increases, there is a red-shift in the optical absorption spectra, as well as the PL spectra. The broadening absorption peaks and PL spectra indicate that the size distributions of CdTe/CdS NPs widen increasingly with the increase of CdS coverage. The PL spectra also show that the fluorescence intensity of CdTe QDs will increase when the particles are covered with CdS shell with ratio of S/Te less than 1.0, otherwise it will decrease if the ratio of S/Te is larger than 1.0. Furthermore, the (CdTe/CdS)@SiO2 particles were prepared using a water-in-oil microemulsion method at room temperature in which hydrolysis of tetraethyl orthosilicate leads to the formation of monodispersed silica nanospheres. The obtained (CdTe/CdS)@SiO2 particles show bright photoluminescence with their fluorescence intensity being enhanced 18.5% compared with that of CdTe NPs. TEM imaging shows that the diameter of these composite particles is 50 nm. These nanoparticles are suitable for biomarker applications since they are much smaller than cellular dimensions." |
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| Keywords: | Quantum dots Photoluminescence Microemulsion Silica coating |
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