A Label-free Photoelectrochemical Sensor Based on Bi2S3@Nitrogen Doped Graphene Quantum Dots for Ascorbic Acid Determination |
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| Authors: | WU Zhifang LIANG Zhishan HE Ziqian WANG Tianqi XIAO Ren HAN Fangjie ZHAO Zhengzheng HAN Dongfang HAN Dongxue NIU Li |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | Photoelectrochemical sensor Ascorbic acid Z-Scheme heterojunction |
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