Sensitive and Selective Determination of Cu2+ by Electrochemiluminescence of CdTe Quantum Dots
Sensitive and Selective Determination of Cu2+ by Electrochemiluminescence of CdTe Quantum Dots
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DOI：
10.1016/j.elecom.2008.07.015
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发表时间：
2008-10
影响因子：
5.4
通讯作者：
Lihua Zhang;Li Shang;S. Dong
中科院分区：
文献类型：
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作者：
Lihua Zhang;Li Shang;S. Dong
本文首次报道了一种基于水溶液中CdTe量子点（QDs）电化学发光猝灭的灵敏、选择性检测Cu2+的方法。制备了巯基琥珀酸（MSA）保护的CdTe量子点，并用紫外、荧光和ECL对其进行了表征。阳极ECL猝灭机制归因于MSA封盖从CdTe量子点表面去除，并优先与Cu2+结合。MSA封盖层的位移在CdTe量子点表面产生缺陷，最终导致ECL猝灭。Cu2+对CdTe量子点阳极ECL的猝灭作用具有选择性和浓度依赖性，因此我们利用Cu2+的猝灭作用建立了一种灵敏、选择性检测Cu2+的方法。该方法可以在亚纳摩尔到微摩尔范围内检测Cu2+的浓度。
For the first time, we report a sensitive and selective method to detect Cu2+based on the electrochemiluminescence quenching of CdTe quantum dots (QDs) in aqueous solution. The mercaptosuccinic acid (MSA) protected CdTe QDs were prepared and characterized with UV, fluorescence and ECL. The anodic ECL quenching mechanism was attributed to the fact that MSA capping was removed from the surface of the CdTe QDs and preferentially bound with Cu2+. The displacement of MSA capping layer created imperfections on the CdTe QDs surface, and eventually led to the ECL quenching. The quenching effect of Cu2+on the anodic ECL of CdTe QDs was found to be selective and concentration dependent, so we applied it to develop a method for the sensitive and selective detection of Cu2+. With the proposed method, the concentration of Cu2+could be detected in the range of sub-nanomolar to micromolar levels.