Enhanced Fluorescence of CdS Quantum Dots by Cadmium(Ⅱ)-Cysteine and Its Application in Ion Detection

doi:10.11944/j.issn.1000-0518.2015.08.140418

Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (8): 969-976.DOI: 10.11944/j.issn.1000-0518.2015.08.140418

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Enhanced Fluorescence of CdS Quantum Dots by Cadmium(Ⅱ)-Cysteine and Its Application in Ion Detection

WU Xiuming,JIN Luyi,XU Yi,WANG Guangli()

The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China

Received:2014-12-09 Accepted:2015-04-02 Published:2015-08-08 Online:2015-08-08
Contact: WANG Guangli
Supported by:
Supported by the National Natural Science Foundation of China(No.21275065, No.21005031)

Abstract

Abstract:

CdS quantum dots capped by citrate(Cit-CdS QDs) were synthesized in aqueous solution. TEM analysis indicates that the Cit-CdS QDs are well-dispered with the diameter of 4 to 6 nm. The influence of silver(Ⅰ), cadmium(Ⅱ), thioglycolic acid, cysteine and the complexes formed by silver(Ⅰ)/cadmium(Ⅱ) with the thiol compounds(thioglycolic acid or cysteine) on the fluorescence of Cit-CdS QDs was investigated. All above modifiers can enhance the fluorescence intensity of Cit-CdS QDs. The complexes above have much greater fluorescence enhancement effect than that of the solely metal ions or thiol compounds. In addition, the CdS QDs modified by the complexes also have much higher sensitivity for copper(Ⅱ) sensing. Based on this phenomenon, a highly sensitive and selective fluorescence probe for Cu²⁺ was developed with a wide range of 1.0×10^-8~1.0×10^-6 mol/L and a low detection limit of 1.0×10^-9 mol/L. It may open up new opportunity for the synthesis and application of complex modified quantum dots in analytical chemistry.

Key words: quantum dots, fluorescence, copper(Ⅱ) ion, sensor, complex

CLC Number:

WU Xiuming, JIN Luyi, XU Yi, WANG Guangli. Enhanced Fluorescence of CdS Quantum Dots by Cadmium(Ⅱ)-Cysteine and Its Application in Ion Detection[J]. Chinese Journal of Applied Chemistry, 2015, 32(8): 969-976.

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Enhanced Fluorescence of CdS Quantum Dots by Cadmium(Ⅱ)-Cysteine and Its Application in Ion Detection

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