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

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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.

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Acknowledgements

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

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Authors and Affiliations

  1. Department of Chemical and Chemical Engineering, Hefei Normal University, Hefei, 230601, People’s Republic of China

    Lu Fang, Yan Xue, Xing-Ming Hu & Dong Xie

  2. School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, People’s Republic of China

    Wen-Jun Li

Authors
  1. Lu Fang
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  2. Yan Xue
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  3. Xing-Ming Hu
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  4. Dong Xie
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Correspondence to Lu Fang.

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Fang, L., Xue, Y., Hu, XM. et al. Enhanced electrochemiluminescence behavior of C,N quantum dots embedded g-C3N4 nanosheets and its sensing application for copper (II). J Mater Sci: Mater Electron 29, 20580–20587 (2018). https://doi.org/10.1007/s10854-018-0193-8

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  • DOI: https://doi.org/10.1007/s10854-018-0193-8

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