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 Cd 2+

作者：Gui, Rijun[1]; An, Xueqin[1]; Su, Hongjuan[1]; Shen, Weiguo[1]; Chen, Zhiyun[1]; Wang, Xiaoyong[1]

机构：[1] Department of Physical Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Meilong Road 130, Shanghai 200237, China

年份：2012

卷号：94

起止页码：257

外文期刊名：Talanta

收录：EI(收录号：20122115056188)

语种：英文

外文关键词：Nanocrystals - II-VI semiconductors - Metal ions - Infrared devices - Semiconductor quantum dots - Cadmium telluride - Metals

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 μM 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. ? 2012 Elsevier B.V. All rights reserved.