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Silica Coating of Water-Soluble CdTe/CdS Core-Shell Nanocrystals by Microemulsion Method
Yong Wang, Shu-hua Niu, Zhi-juan Zhang, Hai-tao Wang, Chun-wei Yuan, De-gang Fu*
Author NameAffiliationE-mail
Yong Wang State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China  
Shu-hua Niu College of Chemistry and Chemical Engineering, Southeast University, Nanjing 210096, China  
Zhi-juan Zhang State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China  
Hai-tao Wang State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China  
Chun-wei Yuan State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China  
De-gang Fu* State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China fudegang@seu.edu.cn 
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."
Key words:  Quantum dots, Photoluminescence, Microemulsion, Silica coating
FundProject:
水溶性CdTe/CdS纳米晶表面SiO2壳层的反相胶束法包覆
王永,牛书花,张志娟,王海涛,袁春伟,付德刚*
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,
关键词:  量子点,荧光,微乳液,SiO2包覆
DOI:10.1088/1674-0068/20/06/685-689
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