Water-soluble silica-overcoated CdS:Mn/ZnS semiconductor quantum dots

被引：56

作者：

Yang, HS ^{[1
]}

Holloway, PH

Santra, S

机构：

[1] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA

[2] Univ Florida, Dept Neurol Surg, Gainesville, FL 32611 USA

来源：

JOURNAL OF CHEMICAL PHYSICS | 2004年 / 121卷 / 15期

关键词：

D O I：

10.1063/1.1797071

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Highly luminescent and photostable CdS:Mn/ZnS core/shell quantum dots are not water soluble because of their hydrophobicity. To create water-soluble quantum dots by an appropriate surface functionalization, CdS:Mn/ZnS quantum dots synthesized in a water-in-oil (W/O) microemulsion system (reverse micelles) were consecutively overcoated with a very thin silica layer (similar to2.5 nm thick) within the same reverse micellar system. The water droplet serves as a nanosized reactor for the controlled hydrolysis and condensation of a silica precursor, tetraethyl orthosilicate (TEOS), using an ammonium hydroxide (NH4OH) catalyst. Structural characterizations with transmission electron microscopy (TEM) and x-ray photoelectron spectroscopy (XPS) indicate that the silica-quantum dot nanocomposites consist of a layered structure. Owing to the amorphous, porous nature of a silica layer, the optical and photophysical properties of silica-overcoated CdS:Mn/ZnS quantum dots are found to remain close to those of uncoated counterparts. (C) 2004 American Institute of Physics.

引用

页码：7421 / 7426

页数：6

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