Journal
FOOD CHEMISTRY
Volume 385, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2022.132731
Keywords
Chlorpyrifos; MXene; Metal-ligand charge transfer; Photoelectrochemical sensor; Schottky junction
Funding
- National Natural Science Foundation of China [21904014, 21904015]
- Natural Science Foundation of Jiangsu Province [BK20211062, BK20190928]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [1KJA610001]
- China Postdoctoral Science Foundation [2020M671366]
- Postdoctoral Science Foundation funded project of Jiangsu Province [2020Z266]
- Jiangsu Association of Science and Technology Young Talent Support Project [2020-07]
- Jiangsu Province Key Laboratory of Materials Surface Science and Technology [KFBM20210001]
- Changzhou Association of Science and Technology Young Talent Support Project and Changzhou Science & Technology Program [CE20215046]
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In this study, a high-performance self-powered photoelectrochemical sensor was successfully fabricated for the assay of chlorpyrifos in fruits and vegetables using a noble-metal-free AgBr/Ti3C2 Schottky interface. The sensor exhibited a wide linear range, low detection limit, good reproducibility and stability, and achieved satisfactory results in river water and apple and cucumber samples.
Herein, a high-performance self-powered photoelectrochemical (PEC) sensor was fabricated for chlorpyrifos (CPF) assay based on the noble-metal-free AgBr/Ti3C2 Schottky interface in fruit and vegetables. The Schottky barrier could provide an electron-transfer irreversible passage from AgBr to Ti3C2 nanosheets, and thus improving the light absorption and efficiency of charge separation. Such Schottky interface exhibited an ultrasensitive and selective photocurrent response for CPF due to the metal-ligand charge transfer effect. Because Ti3C2 MXene nanosheet had coordinative interaction with CPF and thus suppressed its photocurrent response of the Schottky interface, which was further confirmed by the electrochemical impedance spectra and X-ray photoelectron spectroscopy. The developed self-powered PEC sensor showed wide linear range (1 x 10(-3) similar to 1 ng L-1), low detection limit (0.33 pg L-1), limit of quantitation (1 pg L-1), good reproducibility and stability. The sensor was applied for the determination of CPF in river water, apple and cucumber samples with good satisfactory results.
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