The synthesis of Ag@CQDs composite and its electrochemiluminescence application for the highly selective and sensitive detection of chloride

Carbon quantum dots (CQDs) decorated Ag nanoparticles (Ag@CQDs) were successfully synthesized and characterized by UV-Vis spectroscopy, fluorescence, FT-IR, and transmission electron microscopy (TEM), then utilized for the sensitive detection of chloride ions (Cl−). Compared to CQDs, the Ag@CQDs sho...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2016-11, Vol.781, p.114-119
Main Authors: Lu, Yi-Yang, Li, Nian-Lu, Jia, Li-Ping, Ma, Rong-Na, Jia, Wen-Li, Tao, Xu-Qian, Cui, Hui, Wang, Huai-Sheng
Format: Article
Language:English
Subjects:
Ag@CQDs composite
Carbon nanodots
Chloride ion detection
Chloride ions
Electrochemiluminescence
Electroluminescence
Fluorescence
Fourier transforms
Infrared spectroscopy
Nanoparticles
Potassium persulfate
Quantum dots
Sensitivity
Silver chloride
Spectrum analysis
Transmission electron microscopy
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Summary:Carbon quantum dots (CQDs) decorated Ag nanoparticles (Ag@CQDs) were successfully synthesized and characterized by UV-Vis spectroscopy, fluorescence, FT-IR, and transmission electron microscopy (TEM), then utilized for the sensitive detection of chloride ions (Cl−). Compared to CQDs, the Ag@CQDs showed stronger electrochemiluminescence (ECL) in 0.1M PBS (pH=7.4) containing 0.1M K2S2O8. In the presence of chloride (Cl−), a significant reduction in the ECL intensity of Ag@CQDs was noticed, which was used to develop a sensitive detection method of Cl−. The ECL quenching of Ag@CQDs was utilized to establish the method, of which the mechanism might be caused by the formation of AgCl on the Ag@CQDs composite surface. The prepared Cl− sensor showed a wide linear range (0.99–450nM) and low detection limit (0.33nM). Furthermore, the prepared sensor exhibited high sensitivity and good selectivity towards several ion inferences.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2016.05.045