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

页码：257 / 262

页数：6