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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Surface modification of SiO _2 beads with multiple hydrophobic quantum dots for bioapplications
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Surface modification of SiO _2 beads with multiple hydrophobic quantum dots for bioapplications

机译：具有多个疏水量子点的SiO _2珠的表面改性，可用于生物应用

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摘要

Multi hydrophobic CdSe/ZnS or CdSe/Cd _xZn _(1 - x)S quantum dots were encapsulated into SiO _2 beads through a three-step sol-gel procedure. First, the quantum dots were transferred from toluene to water phase via silanization using tetraethyl orthosilicate. The control of ligand exchange (partially hydrolyzed tetraethyl orthosilicate instead of organic amine) resulted in the quantum dots retaining their initial photoluminescence efficiencies after the phase transfer. Second, the assembly of the quantum dots occurs by the hydrolysis and condensation of tetraethyl orthosilicate to form seeds. The amount of 3-mercaptopropyltrimethoxysilane during incorporation plays an important role in controlling the quantum dot number per seed. Third, the seeds are coated with a SiO _2 shell by a subsequent St?ber process. The resulting SiO _2 beads with a controlled number of hydrophobic quantum dots revealed high photoluminescence efficiency. The SiO _2 beads were functionalized with amine, carboxyl, and thiol-terminated biolinkers for surface modification. To confirm the surface modification by carboxyl groups, the SiO _2 beads were conjugated with amino functional polystyrene beads. The silica beads introduced here represent a new platform for nanoparticulate multimodality bioanalysis.
机译：通过三步溶胶-凝胶法将多疏水的CdSe / ZnS或CdSe / Cd _xZn _（1-x）S量子点封装到SiO _2珠中。首先，使用原硅酸四乙酯通过硅烷化将量子点从甲苯转移至水相。控制配体交换（部分水解原硅酸四乙酯而不是有机胺）导致量子点在相转移后保持其初始的光致发光效率。第二，量子点的组装通过原硅酸四乙酯的水解和缩合形成种子而发生。引入期间3-巯基丙基三甲氧基硅烷的量在控制每个种子的量子点数中起重要作用。第三，通过随后的St？ber工艺将种子用SiO _2壳包被。所得的具有受控数量的疏水量子点的SiO _2珠粒显示出高的光致发光效率。 SiO _2珠用胺，羧基和巯基封端的生物连接剂官能化以进行表面修饰。为了证实通过羧基进行的表面改性，将SiO _2珠粒与氨基官能的聚苯乙烯珠粒缀合。此处介绍的硅胶珠代表了纳米颗粒多峰态生物分析的新平台。

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