Carbon-dot-based dual-emission silica nanoparticles as a ratiometric fluorescent probe for Bisphenol A

Guo-Qiang Xiang, Yue Ren, Yin Xia, Wenjie Mao, Chao Fan, Si-Yu Guo, Pan-Pan Wang, Deng-Hui Yang, Lijun He, Xiuming Jiang
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy 2017 April 15, 177: 153-157
A simple and effective strategy for designing a ratiometric fluorescent nanosensor is described in this work. A carbon dots (CDs) based dual-emission nanosensor for Bisphenol A (BPA) was prepared by coating CDs on the surface of dye-doped silica nanoparticles. The fluorescence of dual-emission silica nanoparticles was quenched in hydrochloric acid by potassium bromate (KBrO3 ) oxidation; BPA inhibited KBrO3 oxidation, resulting in the ratiometric fluorescence response of dual-emission silica nanoparticles. Several important parameters affecting the performance of the nanosensor were investigated and optimized. The detection limit of this nanosensor was 0.80ng mL-1 with a linear range from 10 to 500ng mL-1 . This was applied successfully to determine BPA in the leached solution of different plastic products with satisfactory results.

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