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Preparation of Fluorescent SiO_2 Particles with Single CdTe Nanocrystal Cores by the Reverse Microemulsion Method

机译：反向微乳液法制备单CdTe纳米晶核的SiO_2荧光粉

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摘要

Fluorescent GdTe/SiO_2 composite particles with either CdTe@SiO_2 core-shell structures or raisin-bun-type structures were successfully obtained by the reverse-micro-emulsion method. Systematic results reveal that electrostatic interactions between negatively charged CdTe NCs and silica intermediates play a critical role in determining the final structures of the resultant particles. In comparison with methods based on the Stoeber process, the current investigations also provide a much simpler approach for defining the final composite structure of silica spheres incorporating fluorescent NCs and, therefore, will certainly open up a remarkable way to produce high quality fluorescent biolabels. Furthermore, our preliminary experimental results also demonstrate that increasing the thickness of the silica shell in the 15-40 nm range greatly enhances the photostability of the CdTe@SiO_2 core-shell particles with respect to fluorescence intensity; this result indicates that the silica shell can effectively block the diffusion of oxygen. Therefore, it is reasonable to infer that the silica shell can also block the diffusion of Cd~(2+) ions released upon the photo-oxidation of CdTe NCs, and can consequently reduce the cyto-toxicity of those NCs in biological applications.
机译：通过反向微乳液法成功地获得了具有CdTe @ SiO_2核-壳结构或葡萄干-束缚型结构的荧光GdTe / SiO_2复合颗粒。系统性结果表明，带负电的CdTe NCs与二氧化硅中间体之间的静电相互作用在确定所得颗粒的最终结构中起关键作用。与基于Stoeber方法的方法相比，当前的研究还提供了一种更为简单的方法来定义包含荧光NC的二氧化硅球的最终复合结构，因此，无疑将为生产高质量的荧光生物标签开辟一条非凡的途径。此外，我们的初步实验结果还表明，在15-40 nm范围内增加二氧化硅壳的厚度可大大提高CdTe @ SiO_2核壳颗粒相对于荧光强度的光稳定性。该结果表明二氧化硅壳可以有效地阻止氧的扩散。因此，有理由推断，二氧化硅壳还可以阻止CdTe NCs的光氧化时释放的Cd〜（2+）离子的扩散，从而可以降低这些NCs在生物应用中的细胞毒性。

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  • 来源
    《Advanced Materials》 |2005年第19期|p.2354-2357|共4页
  • 作者

    Yunhua Yang; Mingyuan Gao;

  • 作者单位

    Key Laboratory of Colloid, Interface Science and Chemical Thermodynamics Institute of Chemistry, Chinese Academy of Sciences Zhong Guan Cun, Bei Yi Jie 2, Beijing 100080 (P.R. China);

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
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