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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  • Abstract
  • Description
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  • 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 hundred

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

Example Embodiment

[0045] Example 1,

[0046] 1. Porous doped gas sensitive materials and preparation

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

[0048] Preparation steps:

[0049] 0.35g base material SnCl 4 ·5H 2 O, 20mg doped phase raw material SbCl 3 , 0.5g surfactant polyvinylpyrrolidone was added to anhydrous methanol and stirred until all dissolved, the clear liquid after stirring was put into the reactor, and kept at 180 ℃ for 3h, so that the raw material hydrolysis reaction inside the reactor, after the reaction The obtained hydrolysate was se...

Example Embodiment

[0056] Example 2. As described in Example 1, the difference is: in step (1), no doped phase materials are added, and undoped SnO is prepared separately under the same conditions. 2 Matrix material. The separately synthesized matrix material is ultrasonically dispersed in methanol, and the doped raw material SbCl is added to the resulting suspension 3 , Stir for 20min and add 10-20ml of 25% ammonia water dropwise during the process. The resulting precipitate was separated by centrifugation, washed with methanol 5 times, and dried at 80°C for 8 hours. The dried sample is finally calcined in a muffle furnace at 400℃ for 2h to make the doped phase precursor Sb(OH) 3 Reaction converted to Sb 2 O 5 . Obtained Sb 2 O 5 Doped porous nanosphere SnO 2 The scanning electron microscope analysis results of the surface topography are as follows Figure 4 Shown by Figure 4 It can be seen that the two-step synthesis does not change the structure and morphology of the material. The gas sensit...

Example Embodiment

[0058] Example 3: Gas-sensitive detection of different doping phase concentrations

[0059] As described in Example 1, the difference is that the molar ratio of the doping phase to the matrix material in step (1) is 0.5 mol%, 2 mol%, and 5 mol%, respectively. At 80℃, 10ppm NO 2 The gas detection results under gas conditions are as follows Image 6 As shown in the figure, it can be seen that the gas sensitivity of the material changes with the amount of doped phase, but it is different from that of NO at 80℃. 2 The gas has a relatively good response. The response value range is 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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