A near-infrared-emitting CdTe/CdS core/shell quantum dots-based OFF-ON fluorescence sensor for highly selective and sensitive detection of Cd2+

被引：78
|
作者：
Gui, Rijun [1 ]
An, Xueqin [1 ]
Su, Hongjuan [1 ]
Shen, Weiguo [1 ]
Chen, Zhiyun [1 ]
Wang, Xiaoyong [1 ]
机构：
[1] E China Univ Sci & Technol, Dept Phys Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China
来源：
TALANTA | 2012年 / 94卷
基金：
中国国家自然科学基金;
关键词：
Quantum dots; Sensor; Fluorescence quenching; Fluorescence enhancement; NANOCRYSTALS; CDSE; CADMIUM; SHELL; SEPARATION;
D O I：
10.1016/j.talanta.2012.03.036
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A near-infrared-emitting CdTe/CdS core/shell quantum dots (QDs)-based photoluminescence (PL) sensor was designed and applied for highly selective and sensitive detection of Cd2+. This sensor was based on a PL "OFF-ON" mode. First, the addition of ammonium pyrrolidine dithiocarbamate (APDC) led to remarked PL quenching of QDs. Second, PL of APDC surface modified QDs (QDs-APDC) was gradually restored with the each increment of Cd2+ concentration. Experimental results showed that PL of QDs-APDC was near proportional upon the addition of Cd2+ in the range from 0.1 to 2 mu M with a good correlation coefficient of 0.9989. The limit of detection of this proposed method was 6 nM. Interferential experiments confirmed that this sensor of Cd2+ was highly selective over other metal ions. To further investigate perfect analysis performance, this sensor was favorably utilized to determine Cd2+ in tap water, river water and liposome solutions. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：257 / 262
页数：6
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