摘要
We report a photoelectrochemical(PEC)sensor for selective detection of ascorbic(AA)by introducing Z-scheme Bi_(2)S_(3)@nitrogen doped graphene quantum dots(Bi_(2)S_(3)@NGQDs)heterojunctions as efficient photoactive species.The Bi_(2)S_(3)@NGQDs were successfully prepared by a simple hydrothermal process,and the microstructures and components were investigated by various characterized techniques.The photocurrent of the Bi_(2)S_(3)@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 0.1–5µmol/L and 5–1380µmol/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.
基金
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)
the Project of the Department of Guangdong Provincial Public Security,China (No.GZQC20-PZ11-FD084).
