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Gas-sensitive material for detecting NO2 and method for manufacturing gas-sensitive element made of gas-sensitive material

A gas-sensing material and nanofiber technology, applied in the field of gas detection, can solve the problems of low selectivity, affecting the measurement results and application range of the sensor, and small linear response range of the gas to be measured, and achieves good chemical dispersibility and simple preparation method. Controllable and improved gas-sensing performance

Inactive Publication Date: 2016-05-25
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, SnO 2 Gas-sensitive materials still have problems such as relatively low selectivity and small linear response range of the gas to be measured, which directly affect the measurement results and application range of the sensor. Nanomaterials, metal doping and surface modification are all ways to improve their gas sensitivity. effective means

Method used

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  • Gas-sensitive material for detecting NO2 and method for manufacturing gas-sensitive element made of gas-sensitive material
  • Gas-sensitive material for detecting NO2 and method for manufacturing gas-sensitive element made of gas-sensitive material
  • Gas-sensitive material for detecting NO2 and method for manufacturing gas-sensitive element made of gas-sensitive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of SnO 2 Nanofibers

[0027] 0.6g stannous chloride (SnCl 2 2H 2 O) and 1g of polyvinylpyrrolidone (PVP) are added to 10ml of N,N-dimethylformamide (DMF) and absolute ethanol mixed solution (volume ratio DMF:ethanol=1:1), put it Mix evenly on a constant temperature magnetic stirrer, place the solution at room temperature and continue to stir for 24 hours until the solution is clear and transparent, and a uniform and viscous SnCl 2 / PVP precursor solution.

[0028] Pour the resulting precursor solution into a 10ml syringe, cover the syringe needle with a capillary nozzle, insert a metal needle into the syringe and connect it to the positive pole of the high-voltage power supply, adjust the syringe to a horizontal angle of 10°, and spread it on the metal receiving plate A piece of tin foil is used as the negative electrode, the distance between the receiving metal plate and the tip of the capillary is 15cm, and a voltage of 10kV is applied by the high-volt...

Embodiment 2

[0034] Noble metal Au modified SnO 2 Nanofiber material preparation

[0035] Get 0.01g stannous chloride and join in 20mL hydrochloric acid, then add 0.01g prepared SnO 2 Hollow nanofibers, after stirring at room temperature for 6h, the fibers were taken out and rinsed with deionized water for 5 times, and the SnO 2 Activation of hollow nanofibers. The activated fibers were added to 20 mL of 0.05 mmol / L chloroauric acid solution and stirred at room temperature for 2 h. The color of the fibers precipitated in solution changed from white to pink. The fibers were taken out and washed repeatedly with deionized water and ethanol, and then dried at 60°C for 24 h. The final Au-modified SnO 2 hollow nanofibers.

[0036] The product that this step makes is through X-ray diffraction analysis, such as figure 2 As shown, determine the rutile SnO 2 , (JCPDSNo.41-1445), the characteristic diffraction peaks of Au can be seen in the spectrum, and the existence of Au can also be seen ...

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Abstract

The invention discloses a gas-sensitive material for detecting NO2 and a method for manufacturing a gas-sensitive element made of the gas-sensitive material. The gas-sensitive material is prepared into a SnO2 nano-fiber with a rough surface and a hollow tubular structure by adopting an electrospinning method and high-temperature processing, the hollow SnO2 nano-fiber is of a rutile structure, the SnO2 nano-fiber diameter is about 250-300nm, and the thickness of a particle layer is about 40nm. Au particle modification is performed on the surface of SnO2 in an in-situ reduction manner without changing the crystal structure of SnO2. The specific surface area of the material is increased by the one-dimensional hollow nano-structure characteristic of the gas-sensitive material, the gas-sensitive performance of SnO2 is obviously improved by precious metal modification, and higher sensitivity to NO2 and a larger measurement range are presented. The obtained material is applied to the surface of a ceramic tube, annealing is performed, and a calcined ceramic tube core and a nickel-chromium heating wire are welded to a base, accordingly, the gas-sensitive element is manufactured.

Description

technical field [0001] The invention belongs to the technical field of gas detection. Specifically related to a detection of NO 2 The gas sensitive material and the manufacturing method of the gas sensitive element thereof. Background technique [0002] With the rapid development of modern science and technology, the production level of modern industry and agriculture is also rapidly improving, and people's material living standards are also gradually improving. However, environmental pollution is becoming an increasingly serious problem affecting people's normal life. In recent years, due to the improper discharge and leakage of toxic, harmful, flammable and explosive gases in production, a large number of poisoning, explosion, fire and other accidents have been caused. Nitrogen dioxide is one of the most dangerous air pollutants in the world. It plays a major role in the formation of ozone and acid rain. Continuous or regular exposure to nitrogen dioxide concentrations a...

Claims

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Application Information

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IPC IPC(8): G01N27/12B82Y30/00B82Y40/00
CPCG01N27/125B82Y30/00B82Y40/00
Inventor 邵长路刘益春赵英倩沈腾李兴华
Owner NORTHEAST NORMAL UNIVERSITY
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