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

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• 作者：Rijun Gui ^{jacky_0538@163.com} ; Xueqin An ; ^{anxueqin@ecust.edu.cn} ; Hongjuan Su ; Weiguo Shen ; Zhiyun Chen ; Xiaoyong Wang
• 关键词：Quantum dots ; Sensor ; Fluorescence quenching ; Fluorescence enhancement
• 刊名：Talanta
• 出版年：2012
• 期刊代码：106_00399140
• 类别：ch
• 出版时间：30 May, 2012
• 卷：94
• 期：Complete
• 页码：257-262
• 文件大小：699 K

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 鈥淥FF-ON鈥?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 渭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.