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Enhanced electrochemiluminescence behavior of C,N quantum dots embedded g-C3N4 nanosheets and its sensing application for copper (II)

  • Lu Fang
  • Yan Xue
  • Xing-Ming Hu
  • Dong Xie
  • Wen-Jun Li
Article
  • 23 Downloads

Abstract

Electrochemiluminescence (ECL) is a very sensitive method for trace analysis because of its background interference and high signal-to-noise ratio. In the past decade, the determination of Cu2+ in environment has attracted considerable attention since it plays an essential role in many physiological processes. Herein, a novel ECL sensor based on C,N quantum dots embedded g-C3N4 nanosheets (C,N-QDs@NSs) was constructed for the detection of Cu2+. The nanocomposite was rapidly obtained via the oxidation of normal g-C3N4 in H2O2 solution using sonochemical synthesizing method. Due to the abundant surface defects on C,N-QDs@NSs, the ECL intensity was magnified 2.5 times for using a C,N-QDs@NSs electrode in comparision to a g-C3N4 modified electrode. Besides, C,N-QDs@NSs could accelerate the rate of electron transfer in ECL reaction and thus resulted in the lower cathodic peak potential. Significantly, Cu2+ could effectively quench the ECL of C,N-QD@NSs, which endowed C,N-QD@NSs with a great advantage in the ECL detection of Cu2+. under optimum conditions, C,N-QDs@NSs modified electrode exhibited a linear detection range from 5 × 10−4 to 10 µM with a detection limit of 2 × 10−4 µM (S/N = 3) for Cu2+, and was finally applied to detect Cu2+ in real samples with satisfactory results.

Notes

Acknowledgements

This research was funded by National Natural Science Foundation of China (Grant No. 21501040).

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Chemical and Chemical EngineeringHefei Normal UniversityHefeiPeople’s Republic of China
  2. 2.School of Chemical Science and EngineeringTongji UniversityShanghaiPeople’s Republic of China

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