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Low-cost composite fluorescent nano-fiber thin film with high selectivity for detecting TNT as well as preparation method and application thereof

A nanofiber, high-selectivity technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, it can solve the problems of low response efficiency and no detection of strong explosive substances TNT, and achieve fine diameters. , Wide application, large specific surface area

Active Publication Date: 2018-12-18
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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  • Low-cost composite fluorescent nano-fiber thin film with high selectivity for detecting TNT as well as preparation method and application thereof
  • Low-cost composite fluorescent nano-fiber thin film with high selectivity for detecting TNT as well as preparation method and application thereof
  • Low-cost composite fluorescent nano-fiber thin film with high selectivity for detecting TNT as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Firstly, 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. Put the electrospun polymer solution into a 2mL disposable syringe, apply a DC voltage of 10kV to a stainless steel needle with an inner diameter of 0.6mm through electrospinning technology, and inject the polymer solution at a flow rate of 0.003mm / s, and the receiver The distance from the needle is 15cm, the air humidity is 30%HR, and the temperature is 10°C for electrospinning. The fiber is deposited on a 5mm × 25mm × 1mm quartz plate placed on the aluminum foil to obtain a PNIPAM / PyCz nanofiber film. Receive 5min.

[0025] The experimental steps for detecting explosive vapor are as follows: First, take 15 mg of 2,4,6-trinitrotoluene, urea, naphthalene, and sodium nitrite respectively and put them into a cylindrical (diameter φ5mm×height 3mm) aluminum container and...

Embodiment 2

[0033] Firstly, 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. Put the electrospun polymer solution into a 2mL disposable syringe, apply a DC voltage of 10kV to a stainless steel needle with an inner diameter of 0.6mm through electrospinning technology, and inject the polymer solution at a flow rate of 0.003mm / s, and the receiver The distance from the needle is 15cm, the air humidity is 30%HR, and the temperature is 10°C for electrospinning. The fiber is deposited on a 5mm×25mm×1mm quartz plate placed on aluminum foil to obtain PNIPAM / PyCz nanofibers. The time is 5 minutes.

[0034] The experimental steps for detecting explosive vapor are as follows: First, take 15 mg of 2,4,6-trinitrotoluene, urea, naphthalene, and sodium nitrite respectively and put them into a cylindrical (diameter φ5mm×height 3mm) aluminum container and co...

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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, in particular to a low-cost composite fluorescent nanofiber film for highly selective detection of TNT and its preparation method and application, in particular to poly(N-isopropylpropylamide) (PNIPAM ) as matrix, preparation of composite fluorescent nanofibers with 9-(pyrene-1-yl)-9H-carbazole (PyCz) as fluorophore and its highly sensitive recognition of 2,4,6-trinitrotoluene (TNT ) vapor and remove interfering substances. Background technique [0002] Sensitive and selective detection of trace explosive vapors is important for applications in defense, environmental detection, industry, and daily life. 2,4,6-Trinitrotoluene (TNT) is the most common explosive among high-energy explosives. Its vapor pressure is extremely low, and the saturated vapor pressure at 25°C is 4ppb. Therefore, a highly sensitive and efficient Sensing materials for the accurate detection of TN...

Claims

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Application Information

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Patent Type & Authority Applications(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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