A Label-free Photoelectrochemical Sensor Based on Bi2S3@Nitrogen Doped Graphene Quantum Dots for Ascorbic Acid Determination
Zhifang Wu , Zhishan Liang , Ziqian He , Tianqi Wang , Ren Xiao , Fangjie Han , Zhengzheng Zhao , Dongfang Han , Dongxue Han , Li Niu
Chemical Research in Chinese Universities ›› 2022, Vol. 38 ›› Issue (6) : 1387 -1393.
A Label-free Photoelectrochemical Sensor Based on Bi2S3@Nitrogen Doped Graphene Quantum Dots for Ascorbic Acid Determination
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.
Photoelectrochemical sensor / Ascorbic acid / Z-Scheme heterojunction
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