期刊
ACS SENSORS
卷 4, 期 5, 页码 1252-1260出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.9b00125
关键词
nitrite; carbon dots; ratiometric fluorescent probe; agarose hydrogel test kit; visualization
资金
- National Natural Science Foundation of China [21675028, 21507041]
- Nature Sciences Funding of Fujian Province [2018J01682]
- STS Key Project of Fujian Province [2017T3007]
- Cooperative Project of Production and Study in University of Fujian Province [2018Y4007]
- Program for New Century Excellent Talents in Fujian Province University
In this work, we proposed a new method based on carbon dots (named m-CDs) for selective and efficient detection of nitrite (NO2-), which was based on the interaction between the amine group of m-CDs and NO2- via a diazo reaction that produced diazonium salts and induced the fluorescence quenching of m-CDs. The concentration of NO2- shows a good linear relationship with a quenched fluorescence intensity from 0.063 to 2.0 mu M (R-2 = 0.996) with a detection limit of 0.018 mu M. In addition, a ratiometric fluorescence probe (m-CDs@[Ru(bpy)(3)](2+)) was constructed via electrostatic interaction by introducing Ru(bpy)(3)Cl-2 center dot 6H(2)O as an internal reference fluorescent reagent. Interestingly, a transition of the fluorescent color of the ratiometric probe from cyan to red could be visually observed upon increasing the concentration of NO2-. Based on these findings, a ratiometric fluorescent-based portable agarose hydrogel test kit was fabricated and applied for on-spot assessment of NO2- content within 10 min. As far as we know, this is the first ratiometric fluorescent sensor for visual detection of NO2-. It has broad application prospects in environmental monitoring and food safety assessment.
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