Citation: DU Fang-Kai, ZHANG Hui, TAN Xue-Cai, FENG De-Fen, LUO Yan-Ni. Detection of Hydrogen Sulfide Based on Nitrogen-doped Graphene Quantum Dots/Cadmium Sulfide Nanocrystals Electrochemiluminescence Sensor[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(2): 240-247. doi: 10.19756/j.issn.0253-3820.191559 shu

Detection of Hydrogen Sulfide Based on Nitrogen-doped Graphene Quantum Dots/Cadmium Sulfide Nanocrystals Electrochemiluminescence Sensor

School of Chemistry and Chemical and Engineering, Guangxi University for Nationalities, Key Laboratory of Guangxi Colleges and Universities for Food Safety and Pharmaceutical Analytical Chemistry, Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Nanning 530006, China

Received Date: 18 September 2019
Revised Date: 18 November 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 11904059), the Natural Science Foundation of Guangxi Province, China (Nos. 2017GXNSFBA198026, 2018GXNSFAA294044, 2018GXNSFAA281136), the Key Research and Development Project of Guangxi Province, China (No. AB18126048), the Basic Ability Enhancement Program for Young and Middle-aged Teachers of Guangxi Province, China (No. 2018KY0168), and the State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University (No. SKLACL1810).

Nitrogen-doped graphene quantum dots (NGQDs) were synthesized by hydrothermal method with citric acid and ammonia as raw materials. A solid-state electrochemiluminescence (ECL) sensor was thus constructed by dropping NGQDs/CdS nanocluster (NCs) composites. The properties of NGQDs and CdS NCs were characterized by UV-Vis absorption spectroscopy and fluorescence spectroscopy. The electrochemiluminescent and electrochemical behaviors of the sensor were studied. The results showed that NGQDs could enhance electrochemiluminescence signal of CdS NCs and the stability of NGQDs/CdS NCs increased when H₂S was used as the co-reaction reagent of CdS NCs. In the presence of H₂S, S^2- bonded with excess Cd²⁺, and the ECL intensity decreased. Under the optimal conditions, the decrease in electrochemiluminescence intensity varied proportionally with the logarithmic concentration of H₂S from 2.0×10^-10-2.0×10^-5 mol/L, and the detection limit was estimated to be 6.7×10^-11 mol/L. The sensor was used for the determination of H₂S in bovine serum with recoveries of 92.7%-103.8%, which indicated that the proposed sensor had the potential for detection of H₂S in practical complex samples.
- Electrochemiluminescence,
- Graphene quantum dots,
- Cadmium sulfide nanoclusters,
- Hydrogen sulfide
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