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Doped gas-sensitive material having composite structure and used for NO2 gas, gas-sensitive element, production method of gas-sensitive element and application of gas-sensitive material

A technology of composite structure and doped gas, applied in the direction of material resistance, etc., can solve the problems of being easily interfered by other gases, high power requirements of instruments and equipment, insufficient response and recovery capabilities, etc., and achieve low cost of raw materials and instruments , The process parameters are easy to control, avoiding the effect of uneven coating

Active Publication Date: 2016-11-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the monomeric metal oxides for NO 2 The selectivity of gas is poor, and the detection is easily interfered by other gases
At the same time, the optimal operating temperature required for its work is too high, usually reaching hundreds of degrees Celsius or even thousands of degrees Celsius, which requires extremely high power for instruments and equipment
In addition, some materials also have the disadvantages of weak sensitivity, insufficient response and recovery ability

Method used

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  • Doped gas-sensitive material having composite structure and used for NO2 gas, gas-sensitive element, production method of gas-sensitive element and application of gas-sensitive material
  • Doped gas-sensitive material having composite structure and used for NO2 gas, gas-sensitive element, production method of gas-sensitive element and application of gas-sensitive material
  • Doped gas-sensitive material having composite structure and used for NO2 gas, gas-sensitive element, production method of gas-sensitive element and application of gas-sensitive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1. Porous doped gas-sensing material and its preparation

[0047] a NO 2 The gas-doped gas-sensing material with a composite structure is composed of a matrix and a doping phase, and the matrix is ​​SnO with a porous structure 2 Spherical particles, doping phases are distributed on the surface of the matrix and in the pores; the doping phases are Sb 2 o 5 Flaky or spherical particles, the molar ratio of the doping phase to the matrix material is 1 mol%. The doped gas-sensing material is spherical particles with an average diameter of 300-1600nm.

[0048] Preparation steps:

[0049] 0.35g matrix raw material SnCl 4 ·5H 2 O, 20mg doping phase raw material SbCl 3 1. Add 0.5g of surfactant polyvinylpyrrolidone into anhydrous methanol and stir until it is completely dissolved. The stirred clear liquid is put into the reactor and kept at 180°C for 3 hours to make the raw materials undergo hydrolysis reaction inside the reactor. The obtained hydrolyzate was separated b...

Embodiment 2

[0056] Example 2, as described in Example 1, the difference is: no doping phase raw material is added in step (1), and undoped SnO is prepared separately according to the same conditions 2 Matrix material. The separately synthesized matrix material is ultrasonically dispersed in methanol, and the doping raw material SbCl is added to the obtained suspension 3 , stirred for 20 min and added dropwise 10-20 ml of ammonia water with a mass fraction of 25% in the process. The resulting precipitate was separated by centrifugation, washed 5 times with methanol, and dried at 80°C for 8 hours. The dried samples were finally calcined in a muffle furnace at 400 °C for 2 h to make the doped phase precursor Sb(OH) 3 The reaction converts to Sb 2 o 5 . The resulting Sb 2 o 5 Doped porous nanosphere SnO 2 Scanning electron microscopy analysis of the surface morphology showed that Figure 4 shown by Figure 4 It can be seen that the two-step synthesis did not change the structure and...

Embodiment 3

[0058] Example 3, Gas Sensitive Detection of Different Doping Phase Concentrations

[0059] As described in Example 1, the difference is that the molar ratios of the dopant phase to the matrix material in step (1) are 0.5 mol%, 2 mol%, and 5 mol%, respectively. At 80℃, 10ppm NO 2 Gas sensitivity test results under gas conditions are as follows: Image 6 It can be seen from the figure that the gas-sensing performance of the material changes with the amount of doped phase, but they are all the same as those for NO at 80°C. 2 Gas has a relatively good response. Its response value ranges from 500-1000. With the increase of doping phase concentration, the response time is 44s, 20s, 33s and 85s, and the recovery time is 103s, 75s, 114s and 91s.

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Abstract

The invention relates to a doped gas-sensitive material having a composite structure and used for NO2 gas, a gas-sensitive element, a production method of the gas-sensitive element and an application of the gas-sensitive material. The doped gas-sensitive material having the composite structure comprises a matrix and doping phases, wherein the matrix is SnO2, ZnO or Fe2O3 spherical particles with a porous structure, and the doping phases are distributed on the surface of the matrix and in pore channels and are Pt, Sb2O5, CuO or Al2O3 particles. The invention also provides a preparation method of the doped gas-sensitive material having the composite structure and the production method of the gas-sensitive element. The doped gas-sensitive material having the composite structure has characteristics of high selectivity and response values for NO2 gas, low operating temperature, high response and reply speed and the like. The preparation method has the advantages that the operation is easy, equipment is simple, process parameters are easy to control, and the cost is low.

Description

technical field [0001] The invention relates to a gas-sensing material with a doped structure, in particular to a 2 The gas-doped gas-sensing material, the gas-sensing element and its manufacturing method and application belong to the technical field of gas-sensing materials. Background technique [0002] With the increasing development of industry and the improvement of people's living standards, industrial waste gas and domestic waste gas (such as NO 2 , NH 3 , H 2 S, CO, HCHO, etc.) emissions are also increasing day by day, becoming one of the major factors threatening human health, destroying the ecological environment, and hindering social development. Smog, acid rain, greenhouse effect and other phenomena caused by air pollution have seriously affected people's daily life. Therefore, effective monitoring and management of pollutant gas emissions has become an indispensable means of governance. Gas detection technology led by gas-sensitive materials (referred to as...

Claims

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Application Information

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IPC IPC(8): G01N27/12
Inventor 刘伟刘久荣倪禹行乐凯
Owner SHANDONG UNIV
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