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Published on: June 9, 2023
Carbon dots based dual-emission silica nanoparticles as ratiometric fluorescent probe for nitrite determination in
Guoqiang Xiang1, Yule Wang2, Heng Zhang1
1School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China.
Abstract:
In this work, a simple and effective strategy for designing a ratiometric fluorescent nanosensor was described. A carbon dots (CDs) based dual-emission nanosensor for nitrite was prepared by coating the CDs on to dye-doped silica nanoparticles. Dual-emission silica nanoparticles fluorescence was quenched in sulfuric acid using potassium bromate (KBrO3). The nitrite present catalyzed the KBrO3 oxidation, resulting in ratiometric fluorescence response of the dual-emission silica nanoparticles. Several important parameters affecting the performance of the nanosensor were investigated. Under optimized conditions, the limit of detection was 1.0 ng mL-1 and the linear range 10-160 ng mL-1. Furthermore, the sensor was suitable for nitrite determination in different food samples.
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