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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (6): 561-565. 上一篇    下一篇

研究论文

核/壳型CdTe@SiO2荧光纳米复合粒子的制备与表征

尤晓刚, 贺蓉*, 高峰, 邵君, 潘碧峰, 崔大祥*   

  1. (微米/纳米加工技术国家重点实验室 薄膜与微细技术教育部重点实验室
    上海交通大学微纳科技研究院 上海 200030)
  • 投稿日期:2006-07-03 修回日期:2006-08-22 发布日期:2007-03-28
  • 通讯作者: 贺蓉

Preparation and Characterization of CdTe@SiO2 Core/Shell Luminescent Composite Nanoparticles

YOU Xiao-Gang; HE Rong*; GAO Feng; SHAO Jun; PAN Bi-Feng; CUI Da-Xiang*   

  1. (National Key Laboratory of Nano/Micro Fabrication Technology, Key Laboratory for Thin Film and Microfabri-cation of Ministry of Education, Institute of Micro and Nano Science and Technology, Shanghai Jiaotong Uni-versity, Shanghai 200030)
  • Received:2006-07-03 Revised:2006-08-22 Published:2007-03-28
  • Contact: HE Rong

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利用反相微乳法, 以巯基乙酸修饰的水溶性CdTe量子点为核, 包覆SiO2, 制备得到核壳型CdTe@SiO2荧光纳米复合粒子. 用紫外-可见(UV-vis)分光光度计, 荧光(PL)分光光度计, 红外(FT-IR)光谱仪, 透射电子显微镜(TEM)等分析测试手段, 对得到的荧光纳米复合粒子的性能进行表征, 结果表明: 得到的CdTe@SiO2纳米复合粒子是核壳型结构, 由SiO2壳层包覆多个量子点, 其大小均匀, 水溶性好, 有效地提高了量子点的稳定性, 大大增强了其抗光漂白性能, 为该材料的进一步生物应用打下了良好的基础.

关键词: 量子点, 纳米复合粒子, 核壳结构, 光漂白

CdTe@SiO2 core/shell luminescent composite nanoparticles were synthesized by the method of reverse microemulsion to coat SiO2 on water-soluble CdTe QD (quantum dot) cores. And the properties of the as-prepared nanoparticles were characterized by different ways including ultraviolet spectra (UV-vis), fluorescence spectra (FL), FT-IR spectra, and transmission electron microscopy (TEM). The results indicated that the as-prepared nanoparticles had a core/shell structure in which multi-QDs were encapsuled in a single composite nanoparticle. Moreover, the homogeneous nonoparticles had excellent water solubility as well as improved stability and photobleaching resistance. The approach introduced in this paper lays a solid foundation for the biological applications of the nanoparticles.

Key words: quantum dot (QD), composite nanoparticle, core/shell structure, photobleaching