Aqueous synthesis of CdTe/CdS/ZnS quantum dots and their optical and chemical properties.
Aqueous synthesis of CdTe/CdS/ZnS quantum dots and their optical and chemical properties.
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DOI：
10.1002/bio.1250
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发表时间：
2011-11
期刊：
影响因子：
--
通讯作者：
Zhong Li;Chaoqing Dong;Lichuan Tang;Xin-na Zhu;Hongjin Chen;Jicun Ren
中科院分区：
文献类型：
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作者：
Zhong Li;Chaoqing Dong;Lichuan Tang;Xin-na Zhu;Hongjin Chen;Jicun Ren
采用水相合成法制备了巯基包覆的CdTe/CdS/ZnS（核-壳-壳）量子点。对合成条件进行了系统的优化，包括CdTe核的尺寸、退火时间、单层膜的数目和配体的数目，并对合成产物的化学和光学性质进行了研究。结果表明，巯基丙酸（MPA）修饰的CdTe/CdS/ZnS量子点具有较高的光致发光量子产率（PL QYs）、良好的光稳定性和化学稳定性、良好的耐盐性和pH耐受性以及良好的生物相容性。高分辨透射电子显微镜（HRTEM）、X射线粉末衍射（XRD）和荧光相关光谱（FCS）表征表明，CdTe/CdS/ZnS量子点具有良好的单分散性和晶体结构。荧光寿命谱表明，CdTe/CdS/ZnS量子点的荧光寿命比荧光染料和CdTe量子点的荧光寿命长。此外，MPA稳定的CdTe/CdS/ZnS量子点还用于细胞成像。与现有的合成方法相比，该方法具有重复性好、反应条件温和、操作简便等优点。更重要的是，我们的方法是成本有效的，非常适合于大规模合成的CdTe/CdS/ZnS量子点的未来应用。
In this paper, we described a strategy for synthesis of thiol-coated CdTe/CdS/ZnS (core-shell-shell) quantum dots (QDs) via aqueous synthesis approach. The synthesis conditions were systematically optimized, which included the size of CdTe core, the refluxing time and the number of monolayers and the ligands, and then the chemical and optical properties of the as-prepared products were investigated. We found that the mercaptopropionic acid (MPA)-coated CdTe/CdS/ZnS QDs presented highly photoluminescent quantum yields (PL QYs), good photostability and chemical stability, good salt tolerance and pH tolerance and favorable biocompatibility. The characterization of high-resolution transmission electron microscopy (HRTEM), X-ray powder diffraction (XRD) and fluorescence correlation spectroscopy (FCS) showed that the CdTe/CdS/ZnS QDs had good monodispersity and crystal structure. The fluorescence life time spectra demonstrated that CdTe/CdS/ZnS QDs had a longer lifetime in contrast to fluorescent dyes and CdTe QDs. Furthermore, the MPA-stabilized CdTe/CdS/ZnS QDs were applied for the imaging of cells. Compared with current synthesis methods, our synthesis approach was reproducible and simple, and the reaction conditions were mild. More importantly, our method was cost-effective, and was very suitable for large-scale synthesis of CdTe/CdS/ZnS QDs for future applications.