Preparation method of fluorescent thin block and trace explosive TATP optical fiber fluorescent probe

An optical fiber probe, fluorescence technology, applied in fluorescence/phosphorescence, measurement device, material analysis by optical means, etc., can solve the problem of inability to detect TATP in real time, fast and non-contact, and achieve fast film formation speed and high sensitivity , the effect of reducing the detection limit

Active Publication Date: 2021-06-08
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a preparation method of fluorescent thin block and trace explosive TATP optic...

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  • Preparation method of fluorescent thin block and trace explosive TATP optical fiber fluorescent probe
  • Preparation method of fluorescent thin block and trace explosive TATP optical fiber fluorescent probe
  • Preparation method of fluorescent thin block and trace explosive TATP optical fiber fluorescent probe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1, the method for preparing the fluorescent sensitive thin film in this embodiment comprises the following steps:

[0037] 1) Clean and dry the glass substrate, which includes:

[0038] 1a) Cleaning the surface of the glass substrate with deionized water and absolute ethanol in sequence, and then drying the cleaned glass substrate in a vacuum drying oven;

[0039] 1b) Put the dried glass substrate into acetone or analytical grade, and place it in an ultrasonic cleaner for 30 minutes of ultrasonic vibration; after the vibration, take out the glass substrate, clean it with deionized water, and dry it in a vacuum oven.

[0040] Of course, in different embodiments, other methods can also be used for cleaning and drying the glass substrate.

[0041] 2) Place the dried glass substrate in a vacuum evaporation equipment, and evacuate to a pressure of 3×10 -4 Below Pa, the evaporation current is about Control the evaporation rate as Take it out when the thicknes...

Embodiment 2

[0047] Embodiment 2: In this embodiment, the trace explosive TATP optical fiber fluorescence probe includes a reflective optical fiber probe 1, and also includes a fluorescent thin block 2 fixed in front of the reflective optical fiber probe. The reflective optical fiber probe described in this embodiment is provided with Bracket 3, the fluorescent thin block 2 is fixed in front of the reflective fiber optic probe through the bracket 3. The fluorescent thin block includes a glass substrate 201 and a DNNDI-containing fluorescent sensitive film 202 covered on the front of the glass substrate. The fluorescent sensitive film faces the reflective optical fiber probe, and there is a gap between the front end of the reflective optical fiber probe and the fluorescent thin block to make the explosion The gap 4 where the substance vapor is in contact with the fluorescent sensitive film. In this embodiment, the width of the gap 4 is 5 mm, of course, the width of the gap 4 can also be adj...

example 1

[0061] Example 1: The thickness of the DNNDI-containing fluorescence sensitive film coated on the glass substrate of the trace explosive TATP fiber optic fluorescence probe is 60 nm. Different concentrations of TATP vapor were used as research objects, and different concentrations of TATP vapor were used in different experiments to interact with fluorescent sensitive films coated on glass substrates.

[0062] The TATP vapor concentrations used in the experiment were respectively selected from 0ppb (nitrogen), 40ppb, 80ppb, 120ppb, 160ppb and 200ppb. The spectrometer integration time was set to 3 ms. The measured changes in fluorescence intensity ΔF were 0, 131 (a.u), 262 (a.u), 355 (a.u), 531 (a.u), and 703 (a.u), respectively. The linear fitting equation was calculated: ΔF=3.4343C-13.095, correlation coefficient R2=0.9909, so k=3.4343, b=-13.095 in the obtained fitting equation.

[0063] When the TATP vapor to be measured is in contact with the fluorescent sensitive film on...

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Abstract

The invention provides a preparation method of a fluorescent thin block and a trace explosive TATP optical fiber fluorescent probe. The fluorescent thin block comprises a glass substrate and a fluorescent sensitive film of an azetidine derivative containing naphthalimide formed on the front surface of the glass substrate. The preparation of the fluorescent sensitive film comprises the steps of: cleaning and activating the glass substrate; and treating a glass substrate by using an ethanol solution of vinyltrimethoxysilane, and spin-coating the glass substrate with a fluorescent sol-gel solution. The trace explosive TATP optical fiber fluorescent probe comprises a reflective optical fiber probe and a fluorescent thin block, wherein the fluorescent thin block comprises the glass substrate and the fluorescent sensitive film containing DNNDI. According to the preparation method and the trace explosive TATP optical fiber fluorescent probe, the technical problems of real-time, rapid and non-contact detection of TATP and the like are solved.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber fluorescence probe for detecting the vapor concentration of explosives. Background technique [0002] Triacetone triperoxide (TATP) has no chromophore and nitro group in its molecular structure, less solid residue after explosion, easy sublimation and volatilization at room temperature, etc., which increases the difficulty of detection. Therefore, it is of great significance to study a TATP sensor for trace explosives with high sensitivity and low detection limit. [0003] At present, the methods for detecting explosives include macro detection method and trace detection method. The macro detection method is to detect the overall appearance of explosives, which has disadvantages such as low sensitivity, high price, and large equipment volume, and has limitations in application. The trace detection method is mainly a technology to detect the vapors...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/643G01N2021/6432
Inventor 杨建春晏培新赵字宁李小冰
Owner CHONGQING UNIV
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