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

• Published in: Chemical research in Chinese universities Vol. 38; no. 6; pp. 1387 - 1393
• Main Authors: Wu, Zhifang, Liang, Zhishan, He, Ziqian, Wang, Tianqi, Xiao, Ren, Han, Fangjie, Zhao, Zhengzheng, Han, Dongfang, Han, Dongxue, Niu, Li
• Format: Journal Article
• Language: English
• Published: Changchun Jilin University and The Editorial Department of Chemical Research in Chinese Universities 01.12.2022; Springer Nature B.V
• Subjects: Analytical Chemistry; Ascorbic acid; Bismuth sulfides; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Graphene; Heterojunctions; Inorganic Chemistry; Nitrogen; Organic Chemistry; Peppers; Photoelectric effect; Physical Chemistry; Quantum dots; Selectivity; Photoelectrochemical sensor; Ascorbic acid; Z-Scheme heterojunction
• ISSN: 1005-9040; 2210-3171
• DOI: 10.1007/s40242-022-2095-9

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 0.1–5 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.