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Application of double-layer electrostatic spun film sensor in detection of nitro-aromatic substances

A thin-film sensor and electrospinning technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems that the application of double-layer electrospun thin film sensor materials has not been found, so as to reduce the detection limit, improve the response sensitivity, and facilitate transmission. The effect of sensibility

Inactive Publication Date: 2016-05-18
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, no application of double-layer electrospun thin film sensor materials in the detection of nitroaromatics has been found.

Method used

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  • Application of double-layer electrostatic spun film sensor in detection of nitro-aromatic substances
  • Application of double-layer electrostatic spun film sensor in detection of nitro-aromatic substances
  • Application of double-layer electrostatic spun film sensor in detection of nitro-aromatic substances

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] A synthetic method for fluorescent sensing polymer P, comprising the following steps:

[0066] 2,5-dibromothiophene (200mg, 0.9mmol), polyphenylene vinylene polymer (376mg, 0.9mmol) and 2,7-dibromo-9,9-diphenylfluorene (426.6mg, 0.9mol) Dissolve in anhydrous diisopropylamine (DIPA, 2mL) and anhydrous toluene (30mL), place in a 50ml three-necked flask. Pass through argon for 30 minutes, add PdCl 2 (PPh 3 ) 2 (36mg, 2.6×10 -2 mmol), PPh 3 (270mg, 0.90mmol) and CuI (40.5mg, 0.3mmol). 100 ° C reflux reaction for 24h. Then, according to the purification, the fluorescent sensor polymer P is obtained, and the structural formula is shown in Formula 1 of the present invention.

[0067] Fluorescent sensor polymer P: dark yellow solid (400mg, 69%). 1 HNMR: (CDCl 3 ,400MHz), δ(ppm):0.0-2.0(m,20H),7.0-7.2(m,3H),7.4(d,1H,J=7.2HZ),6.0(d,3H,J=5.5HZ) ,7.6-7.9(m,2H).FT-IR(KBr):3060,2967,2921,2850,2198,1710,1600,1452,1414,1259,1103,1026,886,823,753,692,513cm -1 Calcdfor(C 58 h ...

Embodiment 2

[0068] Embodiment 2 A synthetic method of fluorescent sensing polymer P, comprising the following steps:

[0069] 2,5-dibromothiophene (210mg), polyphenylene vinylene polymer (378mg) and 2,7-dibromo-9,9-diphenylfluorene (438mg) were dissolved in anhydrous diisopropylamine (DIPA, 2.5mL) and anhydrous toluene (22mL), placed in a 50ml three-necked flask. Argon protection was passed through for 40 minutes, and PdCl was added 2 (PPh 3 ) 2 (21mg), PPh 3 (252mg) and CuI (63mg). 90 ° C reflux reaction for 36h. Then, according to the purification, the fluorescent sensor polymer P is obtained, and the structural formula is shown in Formula 1 of the present invention.

Embodiment 3

[0071] Preparation of electrospun P-PS films: fluorescent sensing polymers P (0.4 mg) and PS (0.4 g) were dissolved in 4 mL of mixed solution (DMF:THF=3:1) and stirred for 24 hours. Transfer the resulting solution to the syringe of the electrospinning device. Electrospinning was performed with a spinning voltage of 20 kV and a receiving distance of 25 cm. The flow rate of the solution was 1mLH via a syringe pump -1 Control at a constant rate. Finally, an electrospun nanofibrous membrane was formed on a glass slide (1.0 cm×1.7 cm). The electrospun nanofibrous membrane (20 μm) was vacuum dried at 30° C. for 10 hours to remove residual organic solvent.

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Abstract

The invention discloses an application of a double-layer electrostatic spun film sensor in detection of nitro-aromatic substances. The sensor comprises a double-layer film structure, wherein the bottom layer is a gelatin electrostatic spun film (GEL) and is taken as a framework layer to be arranged on the surface of a glass sheet; the top layer adopts PS (polystyrene) as a carrier which is blended with a fluorescent sensing polymer P described in the claim 1, an electrostatic spun film PS-P is prepared, and the layer is a sensing layer. The application of the double-layer electrostatic spun film sensor has the advantages as follows: i) the gelatin contains a large quantities of amino groups and hydroxyl groups, nitro-aromatic compounds are enriched through hydrogen bond interaction between the nitro-aromatic compounds and the gelatin, so that the nitro-aromatic compounds are gathered on the PS-P sensing layer, and the quenching rate is increased; ii) as a porous framework below the PS-P layer, the GEL layer allows upper and lower simultaneous diffusion of nitro-aromatic molecules on the PS-P layer, and the permeability of the PS-P layer is improved greatly.

Description

technical field [0001] The invention relates to the application of a double-layer electrostatic spinning film sensor in the detection of nitroaromatic substances. Background technique [0002] Nitroaromatics such as 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (DNT), picric acid (PA) etc. are all important explosive components, for the use and Transportation must be strictly managed, otherwise it will not only seriously affect social stability and national security, but also cause harm to human health because of its biological toxicity and potential carcinogenicity. Therefore, the detection of explosives has attracted great attention from all countries, and many countries have invested a lot of money in scientific research. The fluorescence sensing method has the characteristics of high sensitivity, many parameters that can be collected (such as fluorescence intensity, fluorescence spectrum shape, fluorescence anisotropy, fluorescence lifetime, etc.), fast response time ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/6402G01N21/643G01N2021/6419G01N2021/6432
Inventor 崔月芝王洁美陶芙蓉李天铎牛庆芬
Owner QILU UNIV OF TECH
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