Construction of off-on electrochemiluminescence sensor based on doped graphene quantum dots for continuous determination of Fe³⁺ and F^-

Authors

ZHANG Xiao-wei, School of Science, Qingdao Technological University, Qingdao, Shandong 266033, China

Abstract

Objective: The study focused on investigating the electrochemiluminescence properties of graphene quantum dots. Methods: By doping heteroatoms into graphene quantum dots (GQDs), the surface chemical reactivities and optical characteristics of GQDs could be effectively improved. Nitrogen and sulfur co-doped graphene quantum dots (NS-GQDs) were prepared using a one-step solonthermic method. Based on its excellent luminescent properties, an “off-on” electrochemiluminescence (ECL) sensor was constructed for the simultaneous determination of Fe³⁺ and F^-. Results: Under the optimal conditions, the quenched ECL value of NS-GQDs was linearly related with the Fe³⁺ concentration in the range 0.1~460.0 μmol/L, and the detection limit was 0.028 μmol/L; Meanwhile, the restored ECL value was linearly related with the F- concentration in the range 1~5 600 μmol/L, and the detection limit was 0.62 μmol/L. Conclusion: The quenching and restoring of the ECL signal had good reversibility. The proposed method was successfully applied to the determination of Fe³⁺ and F^- in water samples, suggesting its potential and significance in food analysis in the future.

Publication Date

11-28-2021

First Page

55

Last Page

60

DOI

10.13652/j.issn.1003-5788.2021.11.010

Recommended Citation

Xiao-wei, ZHANG (2021) "Construction of off-on electrochemiluminescence sensor based on doped graphene quantum dots for continuous determination of Fe³⁺ and F^-," Food and Machinery: Vol. 37: Iss. 11, Article 10.
DOI: 10.13652/j.issn.1003-5788.2021.11.010
Available at: https://www.ifoodmm.cn/journal/vol37/iss11/10

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