文献类型：期刊文献

英文题名：Quantum dot-based "turn-on" fluorescent probe for detection of zinc and cadmium ions in aqueous media

作者：Xu, Hu[1];Miao, Ran[1];Fang, Zheng[1];Zhong, Xinhua[1]

机构：[1]E China Univ Sci & Technol, Dept Chem, Key Lab Adv Mat, Shanghai 200237, Peoples R China

年份：2011

卷号：687

期号：1

起止页码：82

外文期刊名：ANALYTICA CHIMICA ACTA

收录：;EI(收录号：20110313601841);WOS:【SCI-EXPANDED(收录号:WOS:000287065000011)】；

基金：We thank the National Natural Science Foundation of China (No. 20771037), NCET-06-0417, Shuguang Project (065G33), SRFDP (20070251014), the Fundamental Research Funds for the Central Universities, and the Program for Professor of Special Appointment at Shanghai Institutions of Higher Learning for financial support.

语种：英文

外文关键词：Quantum dots; Fluorescent probe; Fluorescence enhancement; Metal ions

摘要：Health or environmental issue caused by abnormal level of metal ions like Zn2+ or Cd2+ is a worldwide concern. Developing an inexpensive and facile detection method for Zn2+ and Cd2+ is in urgent demand. Due to their super optical properties, fluorescent quantum dots (QDs) have been developed as a promising alternative for organic dyes in fluorescence analysis. In this study, a CdTe QDs-based sensitive and selective probe for Zn2+ and Cd2+ in aqueous media was reported. The proposed probe worked in fluorescence "turn-on" mode. The initial bright fluorescence of CdTe QDs was effectively quenched by sulfur anions (S2-). The presence of Zn2+ (or Cd2+) can "turn-on" the weak fluorescence of QDs quenched by S2- due to the formation of ZnS (or CdS) passivation shell. Under optimal conditions, a good linear relationship between the fluorescence response and concentration of Zn2+ (or Cd2+) could be obtained in the range from 1.6 to 35 mu M (1.3-25 mu M for Cd2+). The limit of detection (LOD) for Zn2+ and Cd2+ were found to be 1.2 and 0.5 mu M, respectively. Furthermore, the present probe exhibited a high selectivity for Zn2+ and Cd2+ over other metal ions and was successfully used in the detection of Zn2+ or Cd2+ in real water samples. (C) 2010 Elsevier B.V. All rights reserved.