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A fluorometric optical fiber nanoprobe for copper(II) by using AgInZnS quantum dots

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Abstract

An optical fiber nanoprobe is presented for fluorometric determination of copper(II). The method based on the use of water-dispersible AgInZnS quantum dots (QDs) deposited at the end of an optical fiber in a poly(vinyl alcohol) matrix. The fluorescnece of the QDs, best measured at excitation/emisssion wavelengths of 365/570 nm, is quenched by Cu(II) due to both static and electron transfer from the QDs to Cu(II). This is experimentally confirmed by photoluminescence and UV-vis absorption spectra, and measurement of luminescence lifetimes. The probe is highly selective and possesses a linear detection range that extends from 2.5 to 800 nM.

Schematic representation of an optical fiber nanoprobe based on hydrophilic AgInZnS quantum dots for fluorometric determination of copper(II). The fluorescence is quenched by Cu(II) due to static quenching and dynamic quenching. It has a detection range of 2.5–800 nM.

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Acknowledgements

This work was supported by Science Foundation of China (61635004, 61705023, 61705024, 11574161, 61405023), Key Research and Development Project of Ministry of Science and Technology (2016YFC0801200), the national natural science foundation (61575190), Chongqing Postdoctoral Program for Innovative Talents (CQBX201703), Postdoctoral Science Foundation of Chongqing (Xm2017047), Natural Science Foundation of Chongqing (cstc2018jcyjAX0644), Science and Technology on Plasma Physics Laboratory (6142A0403050817), and National Science Fund for Distinguished Young Scholars (61825501).

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Authors and Affiliations

  1. Key Laboratory of Optoelectronic Technology & Systems of the Education Ministry of China, College of Optoelectronic Engineering, Chongqing University, Chongqing, 400044, China

    Yongfeng Liu, Xiaosheng Tang, Wei Huang, Guolu Yin, Ming Deng, Yulong Cao, Leilei Shi, Tao Zhu, Ligang Huang & Yuan Gong

  2. Information and Communications Engineering from the Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education, Chongqing University, Chongqing, 400044, China

    Iroegbu Paul Ikechukwu

  3. Key Laboratory of Optical Fiber Sensing and Communications (Ministry of Education of China), University of Electronic Science and Technology of China, Chengdu, 611731, Sichuan, China

    Yuan Gong

  4. State Key Laboratory of Safety and Control for Chemicals, SINOPEC Research Institute of Safety Engineering, Qingdao, 266000, China

    Yongzhong Bai, Dingrong Qu, Xianbin Huang & Feng Qiu

Authors
  1. Yongfeng Liu
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  2. Xiaosheng Tang
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  3. Wei Huang
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  9. Ligang Huang
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  10. Iroegbu Paul Ikechukwu
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  13. Dingrong Qu
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  14. Xianbin Huang
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Correspondence to Guolu Yin or Tao Zhu.

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Liu, Y., Tang, X., Huang, W. et al. A fluorometric optical fiber nanoprobe for copper(II) by using AgInZnS quantum dots. Microchim Acta 187, 146 (2020). https://doi.org/10.1007/s00604-020-4110-5

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