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Sizes of water-soluble luminescent quantum dots measured by fluorescence correlation spectroscopy

被引：57
作者：
Zhang, PD
Li, LA
Dong, CQ
Qian, HF
Ren, JC
机构：
[1] Shanghai Jiao Tong Univ, Coll Chem & Chem Engn, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Coll Environm Sci & Engn, Shanghai 200240, Peoples R China
来源：
ANALYTICA CHIMICA ACTA | 2005年 / 546卷 / 01期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
fluorescence correlation spectroscopy; water-soluble quantum dot; size; diffusion;
D O I：
10.1016/j.aca.2005.05.034
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
In this paper, fluorescence correlation spectroscopy (FCS) was applied to measure the size of water-soluble quantum dots (QDs). The measurements were performed on a home-built FCS system based on the Stokes-Einstein equation. The obtained results showed that for bare CdTe QDs the sizes from FCS were larger than the ones from transmission electron microscopy (TEM). The brightness of QDs was also evaluated using FCS technique. It was found that the stability of the surface chemistry of QDs would be significantly improved by capping it with hard-core shell. Our data demonstrated that FCS is a simple, fast, and effective method for characterizing the fluorescent quantum dots, and is especially suitable for determining the fluorescent nanoparticles less than 10 nm in water solution. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：46 / 51
页数：6
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