Fluorescent nanofiber film for detecting tnt and its preparation method and application

A nanofiber and film technology, which is applied in the detection of TNT fluorescent nanofiber film and its preparation and application, can solve the problems of low response efficiency and no detection of strong explosive TNT, and achieves fine diameter, wide application and high specific surface area. big effect

Active Publication Date: 2020-06-19
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the response efficiency of the above-mentioned materials to the highly explosive substance TNT is very low (the quenching efficiency of PS / TMOPPTNT vapor is only 16% in two hours), or no detection (PS / TBAH / Py)
There are currently no reports on the use of PNIPAM as a polymer matrix for explosive vapor detection

Method used

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  • Fluorescent nanofiber film for detecting tnt and its preparation method and application
  • Fluorescent nanofiber film for detecting tnt and its preparation method and application
  • Fluorescent nanofiber film for detecting tnt and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First, 9 mg of PyCz fluorescent probe and 455 mg of PNIPAM polymer were dissolved in 4 mL of DMF solution, and vigorously stirred at 10° C. to form a 2 wt% transparent and uniform electrospinning solution. The electrospinning polymer solution was put into a 2mL disposable syringe, and a 10kV DC voltage was applied to a stainless steel needle with an inner diameter of 0.6mm through electrospinning technology. The polymer solution was injected at a flow rate of 0.003mm / s, and the receiver The distance to the needle is 15cm, the air humidity is 30%HR, and the temperature is 10℃. Electrospinning is carried out. The fiber is deposited on a quartz sheet of 5mm × 25mm × 1mm on aluminum foil to obtain a PNIPAM / PyCz nanofiber film. 5min.

[0025] The experimental procedure for detecting explosive vapor is as follows: firstly take 15mg of 2,4,6-trinitrotoluene, urea, naphthalene, and sodium nitrite into a cylindrical (diameter φ5mm×height 3mm) aluminum container and use plastic wrap...

Embodiment 2

[0033] First, 2.5 mg of PyCz fluorescent probe and 240 mg of PNIPAM polymer were dissolved in 2 mL of DMF solution, and vigorously stirred at 10° C. to form a 1 wt% transparent and uniform electrospinning solution. The electrospinning polymer solution was put into a 2mL disposable syringe, and a 10kV DC voltage was applied to a stainless steel needle with an inner diameter of 0.6mm through electrospinning technology. The polymer solution was injected at a flow rate of 0.003mm / s, and the receiver The distance to the needle is 15cm, the air humidity is 30%HR, and the temperature is 10℃. Electrospinning is carried out, and the fiber is deposited on a 5mm×25mm×1mm quartz plate on the aluminum foil to obtain PNIPAM / PyCz nanofibers. The time is 5min.

[0034] The experimental procedure for detecting explosive vapor is as follows: firstly take 15mg of 2,4,6-trinitrotoluene, urea, naphthalene, and sodium nitrite into a cylindrical (diameter φ5mm×height 3mm) aluminum container and use pla...

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Abstract

The invention discloses a low-cost composite fluorescent nano-fiber thin film with high selectivity for detecting TNT as well as the preparation method and the application of the low-cost composite fluorescent nano-fiber thin film, and particularly provides a composite fluorescent nano-fiber thin film, wherein poly (n-isopropylacrylamide) (PNIPAM) is adopted as the matrix of the composite fluorescent nano-fiber thin film and the 9-(pyrenyl-1-yl)-9H-carbazole (PyCz) is adopted as the fluorescent group of the composite fluorescent nano-fiber thin film. The nano-fiber thin film is applied to thefield of explosive detection for the first time. Due to the fact that a large number of amide groups are arranged on a PNIPAM molecular chain, the interaction between hydrogen bond reinforcement and TNT can be formed by virtue of the PNIPAM molecular chain together with TNT. The fiber can be used for identifying 2, 4 and 6-trinitrotoluene (TNT) steam in a low-cost, high-sensitivity and high-selectivity manner. However, the fiber has no obvious response to naphthalene, urea, toluene, 1,2-dichlorobenzene, sodium nitrite, cigarettes and the like.

Description

Technical field [0001] The invention belongs to the technical field of fluorescent detection of explosives, and specifically relates to a low-cost composite fluorescent nanofiber film for highly selective detection of TNT, and a preparation method and application thereof, and in particular to poly(N-isopropylpropylamide) (PNIPAM) ) As the substrate, the preparation of composite fluorescent nanofibers with 9-(pyrene-1-yl)-9H-carbazole (PyCz) as the fluorophore and its highly sensitive recognition of 2,4,6-trinitrotoluene (TNT ) Steam and remove interferences. Background technique [0002] Highly sensitive and selective detection of trace explosive vapor is very important for applications in national defense, environmental testing, industry and daily life. 2,4,6-Trinitrotoluene (TNT) is the most common explosive in high-energy explosives. Its vapor pressure is extremely low. The saturated vapor pressure at 25°C is 4ppb. Therefore, it has developed high sensitivity and high efficie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/728D04H1/4334D04H1/413G01N21/64B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00D04H1/413D04H1/4334D04H1/728G01N21/643G01N2021/6432
Inventor 石乃恩吴万丹黄维汪联辉薛伟
Owner NANJING UNIV OF POSTS & TELECOMM
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