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Method for preparing explosive sensor array based on manganese-doped zinc sulfide nano-crystal

A manganese-doped zinc sulfide and sensor array technology is applied in the field of explosive detection, which can solve the problems of difficulty in realizing the atmosphere detection and low vapor pressure of non-standard explosive-making raw materials, and achieve the effect of making up for easy interference and rapid identification and detection.

Active Publication Date: 2016-06-22
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Explosives are divided into two categories: the first category is standard explosives, such as trinitrotoluene, 2,4-dinitrotoluene, etc. Although some progress has been made in the detection of standard explosive raw materials in recent years, however There are still huge challenges in identification and detection
The second category is non-standard explosives, such as black powder, which are mainly composed of cheap and easy-to-buy ammonium nitrate, potassium nitrate, potassium chlorate, potassium permanganate and sulfur, which have the characteristics of low vapor pressure, such as ammonium nitrate and The vapor pressures of ammonium perchlorate at 25°C are about 14.7 and 0.0000401ppb respectively, so it is difficult to detect the atmosphere of non-standard explosives and their raw materials for explosives at room temperature
However, since the working temperature of the resistance type gas sensor is generally between 200-500°C, zinc sulfide is prone to irreversible oxidation reaction at such a high temperature

Method used

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  • Method for preparing explosive sensor array based on manganese-doped zinc sulfide nano-crystal
  • Method for preparing explosive sensor array based on manganese-doped zinc sulfide nano-crystal
  • Method for preparing explosive sensor array based on manganese-doped zinc sulfide nano-crystal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Prepare the sensor:

[0034] The second sensor 2, the fourth sensor 4, the sixth sensor 6 and the eighth sensor 8 and the first sensor 1, the third sensor 3, the fifth sensor 5 and the seventh sensor 7 are respectively fixed up and down on the ceramic substrate 25. The sensor 1 is respectively connected to the first electrode 9 and the second electrode 10 through the connecting wires at the upper end and the lower end, and the second sensor 2 is respectively connected to the third electrode 11 and the fourth electrode 12 through the connecting wires at the upper end and the lower end. The third sensor 3 Connect the fifth electrode 13 and the sixth electrode 14 through the connection wires at the upper end and the lower end respectively, the fourth sensor 4 is respectively connected with the seventh electrode 15 and the eighth electrode 16 through the connection wires at the upper end and the lower end, and the fifth sensor 5 The connecting wires at the lower end are res...

Embodiment 2

[0044] Prepare the sensor according to Example 1;

[0045] Preparation of gas-sensitive materials:

[0046] a. Dissolve zinc acetate and manganese acetate in 40-50mL of deionized water at a molar ratio of 100:0-20, and ultrasonically obtain a zinc-manganese mixture solution for 20 minutes. The concentration of zinc ions is 1-1.5mol / L;

[0047] b. After feeding the mixture obtained in step a into nitrogen for 30 minutes, get sodium sulfide with an equimolar amount of zinc acetate and dissolve it in 10 mL of deionized water, ultrasonically for 5 minutes, and keep the concentration of sodium sulfide at 4-6mol / L. Add the sodium sulfide solution dropwise to the mixture obtained in step a, and continue to stir and react at a temperature of 0-30°C for 3-8 hours to obtain manganese ion doping concentrations of 0%, 1%, 1.6%, and 2%, respectively. , 5%, 10%, 14% and 20% zinc sulfide nanocrystal precipitation;

[0048] c. The precipitate obtained in step b is ultrasonically washed with...

Embodiment 3

[0054] Explosives sensor array detection of explosives and their raw materials:

[0055] Connect the Catherine ammeter power supply, under the bias voltage of 4V, test the sensor array that embodiment 1-2 obtains arbitrarily, under room temperature (temperature 25 ℃, relative humidity 25%) in air and 2,4-dinitrotoluene Resistance in saturated vapor, it can be seen from the response curve that at room temperature, the response of the zinc sulfide-based resistive sensor array to the explosive 2,4-dinitrotoluene reaches 18.3%, 19.9%, 33.7%, 37.5% respectively. %, 45.4%, 38.5%, 28.5%, and 27.8%; response times were 4, 4, 3, 3, 3, 4, 4, and 5 seconds; recovery times were 7, 6, 5, 9, 5, 7 , 7 and 8 seconds (eg Figure 5 ).

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Abstract

The invention relates to a method for preparing an explosive sensor array based on a manganese-doped zinc sulfide nano-crystal. A device involved in the method is composed of eight sensors, a ceramic base and sixteen electrodes. The manganese ion doping is utilized to cause the change in surface state and electron used-up layer, so that the difference in detection performances of the sensors is caused; a radar finger-print data processing method is adopted for quickly identifying and detecting two system explosives, trinitrotoluene and 2,4-dinitrotoluene and six non-system explosive raw materials, namely, potassium nitrate, black powder, potassium permanganate, sulphur, farm-oriented urea fertilizer and urea at room temperature (1-7 seconds); the defects of incapability of identifying and high error reporting rate of the traditional sensor can be overcome. The preparation method for the sensor array provided by the invention is simple and has the advantage of non-contact type identifying detection under room temperature and the practicality of the sensor array is greatly increased.

Description

technical field [0001] The invention relates to the field of explosive detection, in particular to a preparation method of an explosive sensor array based on zinc sulfide nanocrystals that can detect standard and non-standard explosive atmospheres. Background technique [0002] In recent years, worldwide, terrorist activities are rampant and terrorist bombing attacks are on the rise year by year. Explosives are divided into two categories: the first category is standard explosives, such as trinitrotoluene, 2,4-dinitrotoluene, etc. Although some progress has been made in the detection of standard explosive raw materials in recent years, however Recognition detection remains a huge challenge. The second category is non-standard explosives, such as black powder, which are mainly composed of cheap and easy-to-buy ammonium nitrate, potassium nitrate, potassium chlorate, potassium permanganate and sulfur, which have the characteristics of low vapor pressure, such as ammonium nitr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00G01N27/127
Inventor 吴钊峰周超玉祖佰祎窦新存
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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