Preparation of hydrophilic fluorescent nanospheres by a photopolymerization method and its application in the detection of 2,4,6-trinitrotoluene explosives

Abstract

The invention discloses a photo-polymerization method for preparing hydrophilic fluorescent nano spheres and application thereof in detection of a 2,4,6-trinitrotuluene explosive. In the invention, through a photo-exciting in-situ polymerization method, oil-phase quantum dots are polymerized to form the hydrophilic fluorescent nano spheres, wherein by means of adjustment and control of addition amount of an allyl mercaptan monomer, the nano spheres being adjustable and controllable in particle size in the range of 50-100 nm. Amino groups modified on the surface of the nano spheres can be specifically combined with 2,4,6-trinitrotuluene under a strong alkaline condition with electron transfer occurring, so that a wide absorption peak in the range of 350-600 nm can be formed. Under excitation by a near-infrared light being 342 nm in wavelength, the absorption peak can be overlapped with an emission peak at the position of 591 nm of manganese-doped zinc sulfide quantum dot nano particles, thereby generating effective fluorescent quenching. By means of detection of fluorescent intensity, an object of qualitatively and quantitatively detecting the 2,4,6-trinitrotuluene can be achieved. Compared with a conventional detection method, the method is simple in operation, is less in background interference, is strong in signal, is low in cost, is low in limit of detection, is quick and accurate and is high in sensitivity.

Description

technical field [0001] The invention belongs to the technical field of nitro-explosive sensing and detection, and in particular relates to the preparation of hydrophilic fluorescent nanospheres by an in-situ photopolymerization method and its application in the detection of 2,4,6-trinitrotoluene explosives. [0002] technical background [0003] With the development of society, people pay more and more attention to homeland security, human health and green environment, the detection of explosive residues and explosive analogues has attracted scientific attention, and has become an important international tool to deal with the threat of terrorism, soil and groundwater pollution The rapid, sensitive and selective analysis of explosives and their analogues is one of the most concerned areas of the analytical chemistry community and society. According to the classification of chemical properties, explosives can be divided into nitroaromatics, nitrates, diazonium compounds and per...

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Problems solved by technology

However, these methods have certain limitations, such as complicated and expensive equipment that cannot be widely used, low detection limit of explosives, low sensitivity, inability to achieve selective detection, and unstable detection methods (Wang Kanglin, Yu Shaoming, Chen Min. Detection method of trace trinitrotoluene explosives in aqueous solution[J]. Guangzhou Chemical Industry, 2010,38(12):22-24.)

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