Near-Infrared Electrogenerated Chemiluminescence of Ultrasmall Ag2Se Quantum Dots for the Detection of Dopamine

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• 作者：Ran Cui ; Yi-Ping Gu ; Lei Bao ; Jing-Ya Zhao ; Bao-Ping Qi ; Zhi-Ling Zhang ; Zhi-Xiong Xie ; Dai-Wen Pang
• 刊名：Analytical Chemistry
• 出版年：2012
• 出版时间：November 6, 2012
• 年：2012
• 卷：84
• 期：21
• 页码：8932-8935
• 全文大小：270K
• 年卷期：v.84,no.21(November 6, 2012)
• ISSN：1520-6882

文摘

The near-infrared (NIR) electrogenerated chemiluminescence (ECL) of water-dispersed Ag₂Se quantum dots (QDs) with ultrasmall size was presented for the first time. The Ag₂Se QDs have shown a strong and efficient cathodic ECL signal with K₂S₂O₈ as coreactant on the glassy carbon electrode (GCE) in aqueous solution. The ECL spectrum exhibited a peak at 695 nm, consistent with the peak in photoluminescence (PL) spectrum of the Ag₂Se QDs solution, indicating that the Ag₂Se QDs had no deep surface traps. Dopamine was chosen as a model analyte to study the potential of Ag₂Se QDs in the ECL analytical application. The ECL signal of Ag₂Se QDs can also be used for the detection of the dopamine concentration in the practical drug (dopamine hydrochloride injection) containing several adjuvants such as edetate disodium, sodium bisulfite, sodium chloride and so on. The Ag₂Se QDs could be a promising candidate emitter of ECL biosensors in the future due to their fantastic features, such as ultrasmall size, low toxicity, good water solubility, and near infrared (NIR) fluorescent emission.