Diethyldithiocarbamate functionalized CdSe/CdS quantum dots as a fluorescent probe for copper ion detection

Jiazi Wang, Xiaopan Zhou, Hongbing Ma, Guanhong Tao
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy 2011 October 15, 81 (1): 178-83
A new fluorescent probe for copper ion detection is reported that it is based on the quenching of the fluorescence of the diethyldithiocarbamate (DDTC)-functionalized quantum dots (QDs) in the presence of copper ions. DDTC was bound to the QDs via the surface ligand exchange to form DDTC-QDs conjugates following the capping of 2-mercaptoacetic acid on the core-shell CdSe/CdS QDs. It was found that the fluorescence intensity of the conjugates was quenched after coordinated with Cu(2+). A linear relationship existed between the extent of quenching and the concentration of copper in the range of 0-100 μg L(-1), with a detection limit of 0.29 μg L(-1) (3σ). The DDTC-functionalized QDs showed excellent selectivity for Cu(2+) over other metal cations. The fluorescent probe was successfully used for the determination of copper in environmental samples.

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