Colorimetric Sensing of Benzoyl Peroxide Based on the Emission Wavelength-Shift of CsPbBr<sub>3</sub> Perovskite Nanocrystals
Using the ionic salt characteristics of CsPbBr<sub>3</sub> perovskite nanocrystals (CsPbBr<sub>3</sub> NCs), the fluorescence wavelength of CsPbBr<sub>3−x</sub>I<sub>x</sub> NCs could be changed by the halogen exchange reaction between CsPbBr<sub>...
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| Autores principales: | , , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/e61e2337719841feb23dc2bb72563d30 |
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| Sumario: | Using the ionic salt characteristics of CsPbBr<sub>3</sub> perovskite nanocrystals (CsPbBr<sub>3</sub> NCs), the fluorescence wavelength of CsPbBr<sub>3−x</sub>I<sub>x</sub> NCs could be changed by the halogen exchange reaction between CsPbBr<sub>3</sub> NCs and oleylammonium iodide (OLAM-I). Under the excitation of a 365 nm UV lamp and the increase of OLAM-I concentration, the content of iodine in CsPbBr<sub>3−x</sub>I<sub>x</sub> NCs increased, and the fluorescence emission wavelength showed a redshift from 511.6 nm to 593.4 nm, resulting in the fluorescence color change of CsPbBr<sub>3</sub> NCs from green to orange-red. Since OLAM-I is a mild reducing agent and easily oxidized by benzoyl peroxide (BPO), a novel colorimetric sensing approach for BPO based on the fluorescence wavelength shift was established in this study. The linear relationship between the different wavelength shifts (Δλ) and the concentration of BPO (C<sub>BPO</sub>) is found to be in the range of 0 to 120 μmol L<sup>−1</sup>. The coefficient of alteration (R<sup>2</sup>) and the detection limit are 0.9933 and 0.13 μmol L<sup>−1</sup> BPO, respectively. With this approach, the determination procedure of BPO in flour and noodle samples can be achieved in only a few minutes and exhibit high sensitivity and selectivity. |
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