量子点
硅氧烷
纳米晶
量子产额
半导体
材料科学
化学工程
纳米颗粒
胶体
纳米技术
粒径
半最大全宽
涂层
荧光
光致发光
光电子学
聚合物
复合材料
工程类
物理
量子力学
作者
Daniele Gerion,Fabien Pinaud,Shara C. Williams,Wolfgang J. Parak,Daniela Zanchet,Shimon Weiss,A. Paul Alivisatos
摘要
We describe the synthesis of water-soluble semiconductor nanoparticles and discuss and characterize their properties. Hydrophobic CdSe/ZnS core/shell nanocrystals with a core size between 2 and 5 nm are embedded in a siloxane shell and functionalized with thiol and/or amine groups. Structural characterization by AFM indicates that the siloxane shell is 1−5 nm thick, yielding final particle sizes of 6−17 nm, depending on the initial CdSe core size. The silica coating does not significantly modify the optical properties of the nanocrystals. Their fluorescence emission is about 32−35 nm fwhm and can be tuned from blue to red with quantum yields up to 18%, mainly determined by the quantum yield of the underlying CdSe/ZnS nanocrystals. Silanized nanocrystals exhibit enhanced photochemical stability over organic fluorophores. They also display high stability in buffers at physiological conditions (>150 mM NaCl). The introduction of functionalized groups onto the siloxane surface would permit the conjugation of the nanocrystals to biological entities.
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