Chemical Research in Chinese Universities ›› 2022, Vol. 38 ›› Issue (6): 1387-1393.doi: 10.1007/s40242-022-2095-9

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A Label-free Photoelectrochemical Sensor Based on Bi2S3@Nitrogen Doped Graphene Quantum Dots for Ascorbic Acid Determination

WU Zhifang1, LIANG Zhishan1, HE Ziqian1, WANG Tianqi1, XIAO Ren1, HAN Fangjie1, ZHAO Zhengzheng1, HAN Dongfang1, HAN Dongxue1,2, NIU Li1   

  1. 1. School of Civil Engineering, Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China;
    2. Guangdong Provincial Key Laboratory of Psychoactive Substances Monitoring and Safety, Anti-Drug Technology Center of Guangdong Province, Guangzhou 510230, P. R. China
  • Received:2022-03-17 Online:2022-12-01 Published:2022-12-06
  • Contact: HAN Dongxue E-mail:dxhan@gzhu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(Nos.22172040, 21974031), the Project of the Department of Science and Techniques of Guangdong Province, China(Nos.2021A1515010180, 2019B010933001), the Guangzhou Municipal Science and Technology Bureau, China(No. 202102010449), and the Project of the Department of Guangdong Provincial Public Security, China(No.GZQC20-PZ11-FD084).

Abstract: We report a photoelectrochemical(PEC) sensor for selective detection of ascorbic(AA) by introducing Z-scheme Bi2S3@nitrogen doped graphene quantum dots(Bi2S3@NGQDs) heterojunctions as efficient photoactive species. The Bi2S3@NGQDs were successfully prepared by a simple hydrothermal process, and the microstructures and components were investigated by various characterized techniques. The photocurrent of the Bi2S3@NGQDs-based sensor increased significantly in the presence of AA and showed excellent selectivity and stability for AA detection in the presence of some other antioxidants and small molecules. A wide linear range of 0.1-5 μmol/L and 5-1380 μmol/L was achieved for the AA detection with a detection limit of 36 nmol/L(S/N=3). Moreover, the proposed PEC sensor achieved the determination of AA in real red peppers and commercially available vitamin C tablets samples.

Key words: Photoelectrochemical sensor, Ascorbic acid, Z-Scheme heterojunction