The Detection Of Pesticide Based On Carbon Dots And Molecular Imprinting Technology

Carbon nanodots(C-dots) are fascinating fluorescent materials that show a great chemical inertness and biocompatibility compared to quantum dots and present potential and broad prospects in biological imaging and analysis based on its great sensitivity. The works in this research includes:1. Carbon dots in the detection of quizalofop-p-ethylWe synthesis amine-capped carbon dots with citric acid and urea through microwave method. We found the fluorescence intensity of carbon dots will be quenched by quizalofop-p-ethyl in 15 kinds of pesticides. The limit of detection is 0.66μg/m L under 280 nm excitation wavelength and p H=5.5.2. Visual detection of beta-cypermethrin based on the nanohybrid of fluorescence carbon dots and quantum dotsWe develop a fluorescence sensor for detection of beta-cypermethrin by mixing green-emission carbon dots and red-emission quantum dot. Meanwhile, the nanohybrid have 440 nm and 690 nm fluorescence respectively under 365 nm excitation wavelength. Therefore, the fluorescence colorof the nanohybrid solution gradually changed to blue from red upon the increasing concentration of betacypermethrin added and the phenomenon could be obviously observed by the naked eyes. The limit of detection is 1.37μg/m L.3. Preparation of molecular imprinting nanospheres on the surface of carbon dots and direct quantitative determination of difenoconazolewe report a new composite C-dots@MIP nanospheres formation with silica imprinting film for specific recognition and direct fluorescent quantification of difenoconazole with functional monomer APTES, cross-linker TEOS through sol-gel method. The nanospheres have excellent dispersity and the limit of detection reach to 0.93μg/m L, which shows broad prospects in pesticide detection.