1. N–doped graphene quantum dots embedded in BiOBr nanosheets as hybrid thin film electrode for quantitative photoelectrochemical detection paracetamol.
- Author
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Gao, Kai, Bai, Xue, Zhang, Yi, and Ji, Yetong
- Subjects
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QUANTUM dot synthesis , *HETEROJUNCTIONS , *THIN films , *QUANTUM dots - Abstract
A facile strategy of electrophoretic deposition has been employed to fabricate a thin film photoelectrochemical (PEC) sensor of functionalized N–doped graphene quantum dots (F–NGQDs) embedded in BiOBr nanosheets, which were prepared by a two–step hydrothermal method, loaded onto indium–tin–oxide coated glass substrate (F–NGQDs/BiOBr/ITO). Electrophoretic deposition provides a mild and environmentally friendly method for PEC film formation. Multiple techniques were applied to investigate the electronic, optical properties and structure of F–NGQDs/BiOBr thin films photoelectrodes. It was found that F–NGQDs/BiOBr thin films with NGQDs/BiOBr heterojunction possess an enhanced charge transfer and absorption wavelengths under visible light, particularly when compared to pristine F–BiOBr films, thus producing an increase in the observed photocurrent. Sensing performance measurements showed the F–NGQDs/BiOBr/ITO photoelectrode has a higher photoelectric response current to paracetamol, it was used to detect trace paracetamol under visible light irradiation. The sensor exhibited a wide linear range, low detection limit and good sensitivity, given the photoactivity of NGQDs/BiOBr heterojunction. The developed PEC sensor displayed an acute response to paracetamol in a linear range of 0.01 μM–20.0 μM with a detection limit of 3.33 nM, under optimal conditions. Here we present evidence that F–NGQDs/BiOBr/ITO photoelectrode is a promising candidate for PEC analysis. • NGQDs embedded in BiOBr nanosheets were prepared by a two-step hydrothermal method. • F–NGQDs/BiOBr nanocomposites were deposited onto ITO coated glass substrate by electrophoretic deposition. • This platform is simple in preparation and has the potential to achieve simple and specific detection of paracetamol. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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