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Silica capped CdS/Cd(OH)_2 quantum dots for biological applications

机译：二氧化硅封端的CdS / Cd（OH）_2量子点的生物学应用

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摘要

In the last few years, quantum confinement effects in semiconductor nanocrystals (quantum dots - QDs) have attracted a significant amount of interest due to their new optical properties and also because of their potential applications in biological systems. In this work, cadmium sulphide (CdS) nanoparticles were synthesized in aqueous medium and passivated with Cd(OH)_2. Polyphosphate ions were used in order to avoid particle aggregation. After the passivation step, CdS/Cd(OH)_2 quantum dots were coated with silica. Silica coating has been extensively investigated concerning its properties in biocompatibilizing QDs to biological systems. Silica coated core-shell CdS/Cd(OH)_2 water soluble QDs optical properties were studied by absorption, excitation and emission spectroscopies, while their morphological characterization was carried out by transmission electron microscopy.
机译：在最近几年中，半导体纳米晶体（量子点-QDs）中的量子限制效应由于其新的光学特性以及它们在生物系统中的潜在应用而引起了人们的极大兴趣。在这项工作中，硫化镉（CdS）纳米粒子在水性介质中合成并用Cd（OH）_2钝化。为了避免颗粒聚集，使用了多磷酸根离子。在钝化步骤之后，用二氧化硅涂覆CdS / Cd（OH）_2量子点。二氧化硅涂层已被广泛研究，涉及其在生物相容性QD与生物系统中的性能。通过吸收，激发和发射光谱学研究了二氧化硅包覆的核壳CdS / Cd（OH）_2水溶性QDs的光学性质，并通过透射电子显微镜对它们的形貌进行了表征。

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  • 来源
  • 会议地点 San Francisco CA(US)
  • 作者

    C. R. Chaves; D. B. Almeida; C. L. Cesar; A. Fontes; B. S. Santos; P. M. A. Farias;

  • 作者单位

    Nanoestruturas e Interfaces Biologicas Research Group, UFPE, 50740-120, Recife, PE, Brazil Programa de Pos-graduacao em Ciencias de Materials, CCEN, UFPE, 50740-120, Recife, PE, Brazil;

    Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, 13083-970, Campinas, SP, Brazil;

    Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, 13083-970, Campinas, SP, Brazil;

    Nanoestruturas e Interfaces Biologicas Research Group, UFPE, 50740-120, Recife, PE, Brazil Programa de Pos-graduacao em Ciencias Biologicas, UFPE, 50740-120, Recife, PE, Brazil;

    Nanoestruturas e Interfaces Biologicas Research Group, UFPE, 50740-120, Recife, PE, Brazil Dept. Ciencias Farmaceuticas, UFPE, 50740-120, Recife, PE, Brazil;

    Nanoestruturas e Interfaces Biologicas Research Group, UFPE, 50740-120, Recif;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 医用物理学;
  • 关键词

    nanocrystals quantum dots silica biological systems;

    机译：纳米晶体量子点二氧化硅生物系统;

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