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Citation: WU Xiuming, JIN Luyi, XU Yi, WANG Guangli. Enhanced Fluorescence of Cd S Quantum Dots by Cadmium (Ⅱ)-Cysteine and Its Application in Ion Detection[J]. Chinese Journal of Applied Chemistry, ;2015, 32(8): 969-976. doi: 10.11944/j.issn.1000-0518.2015.08.140418 shu

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

1.
The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China

Corresponding author: WANG Guangli,
Received Date: 9 December 2014
Available Online: 28 January 2015
Fund Project: 国家自然科学基金项目(21275065,21005031) (21275065,21005031)

CdS quantum dots capped by citrate (Cit-Cd S QDs) were synthesized in aqueous solution.TEM analysis indicates that the Cit-Cd S 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^-6mol/L and a low detection limit of 1.0×10^-9mol/L.It may open up new opportunity for the synthesis and application of complex modified quantum dots in analytical chemistry.
- quantum dots,
- fluorescence,
- copper (Ⅱ) ion,
- sensor,
- complex
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