文献类型：期刊文献

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

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

年份：2012

卷号：94

起止页码：257

外文期刊名：TALANTA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000305167300039)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Nos. 20673059 and 20573056), the Nature Science Keystone Foundation of Shanghai (08jc1408100), the Nanotechnology Special Program Foundation of Shanghai (0652nm010), and the Fundamental Research Funds for the Central Universities of China (WK0913002).

语种：英文

外文关键词：Quantum dots; Sensor; Fluorescence quenching; Fluorescence enhancement

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.