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Photo-polymerization method for preparing hydrophilic fluorescent nano spheres and application thereof in detection of 2,4,6-trinitrotuluene explosive

A fluorescent nanometer and hydrophilic technology, which is applied in the field of nitro explosive sensing and detection, can solve the problems of low sensitivity, difficult to operate equipment, complex instruments, etc., and achieve the effect of small background interference, low detection limit and high sensitivity

Active Publication Date: 2015-07-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have certain limitations, such as complex and difficult to operate instruments and expensive equipment that cannot be widely used, low detection limit of explosives, low sensitivity, inability to achieve selective detection, and instability of detection methods.

Method used

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  • Photo-polymerization method for preparing hydrophilic fluorescent nano spheres and application thereof in detection of 2,4,6-trinitrotuluene explosive
  • Photo-polymerization method for preparing hydrophilic fluorescent nano spheres and application thereof in detection of 2,4,6-trinitrotuluene explosive
  • Photo-polymerization method for preparing hydrophilic fluorescent nano spheres and application thereof in detection of 2,4,6-trinitrotuluene explosive

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. 0.8mmol of zinc sulfide doped with manganese quantum dots (the molar doping amount of manganese is 5%) and 0.06mmol of 0.06mmol of chloroform are injected into 6mL of chloroform, stirred evenly for 20min, and the product is used Precipitate with 20mL of ethanol, centrifuge to obtain a white precipitate, and then ultrasonically disperse it in 4mL of chloroform to obtain an allyl thiol-modified zinc sulfide-doped manganese quantum dot dispersion;

[0025] 2. Add 18mg sodium dodecylsulfonate into 10mL deionized water to completely dissolve;

[0026] 3. Mix 0.25mL of the dispersion obtained in step 1, 6.25μg of azobisisobutyronitrile, and 0.75mL of chloroform evenly, pour it into the aqueous solution of sodium dodecylsulfonate prepared in step 2, and place it in an ultrasonic cell disruptor Ultrasound for 3 minutes to obtain a white microemulsion;

[0027] 4. Place the white microemulsion obtained in step 3 under a 365nm ultraviolet laser and irradiate it for 10 minutes...

Embodiment 2

[0030] 1. 0.5mmol of zinc sulfide doped with manganese quantum dots (the molar doping amount of manganese is 5%) and 0.06mmol of 0.06mmol of chloroform are injected into 6mL of chloroform, stirred evenly for 20min, and the product is used Precipitate with 20mL of ethanol, centrifuge to obtain a white precipitate, and then ultrasonically disperse it in 4mL of chloroform to obtain an allyl thiol-modified zinc sulfide-doped manganese quantum dot dispersion;

[0031] 2. Add 18mg sodium dodecylsulfonate into 10mL deionized water to completely dissolve;

[0032] 3. Mix 0.40 mL of the dispersion obtained in step 1, 10.0 μg of azobisisobutyronitrile, and 0.60 mL of chloroform evenly, pour it into the aqueous solution of sodium dodecylsulfonate prepared in step 2, and place it in an ultrasonic cell disruptor Ultrasound for 3 minutes to obtain a white microemulsion;

[0033] 4. Place the white microemulsion obtained in step 3 under a 365nm ultraviolet laser and irradiate it for 10 minu...

Embodiment 3

[0036] 1. Inject 0.3mmol of zinc sulfide-doped manganese quantum dots in the oil phase (the molar doping amount of manganese is 5%), and 0.06mmol of allyl mercaptan are injected into 6mL of chloroform, stirred evenly for 20min, and the product is precipitated with 20mL of ethanol, Centrifuge to obtain a white precipitate, and then ultrasonically disperse it in 4 mL of chloroform to obtain an allyl thiol-modified zinc sulfide-doped manganese quantum dot dispersion;

[0037] 2. Add 18mg sodium dodecylsulfonate into 10mL deionized water to completely dissolve;

[0038] 3. Mix 0.66 mL of the dispersion obtained in step 1, 16.5 μg of azobisisobutyronitrile, and 0.34 mL of chloroform evenly, pour it into the aqueous solution of sodium dodecylsulfonate prepared in step 2, and place it in an ultrasonic cell disruptor Ultrasound for 3 minutes to obtain a white microemulsion;

[0039] 4. Place the white microemulsion obtained in step 3 under a 365nm ultraviolet laser and irradiate it f...

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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. technical background [0002] 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 peroxides. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 汪乐余白敏
Owner BEIJING UNIV OF CHEM TECH
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