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Preparation method of quick response type gas sensitive material

A gas-sensitive material and fast-response technology, which is applied in the analysis of materials, material resistance, and material analysis through electromagnetic means, can solve the problems of low sensitivity of gas-sensitive materials, low gas molecule adsorption efficiency, long response recovery time of gas-sensitive materials, etc. problems, to achieve the effect of facilitating adsorption, improving gas-sensing performance, and increasing adsorption capacity

Inactive Publication Date: 2018-11-16
吴刚
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Problems solved by technology

[0005] The main technical problem to be solved by the present invention is to provide a quick-response method for the defects that the current traditional semiconductor metal oxide gas-sensing materials have low adsorption efficiency to gas molecules, resulting in low sensitivity of the gas-sensing materials and long response recovery time of the gas-sensing materials. Preparation method of type gas sensitive material

Method used

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Embodiment Construction

[0023] Mix equal volumes of water and absolute ethanol to obtain an alcohol-water mixture, then dissolve 6-8g of nickel chloride hexahydrate in a beaker filled with 40-45mL of alcohol-water mixture, and stir magnetically at a speed of 400-450r / min 4 to 5 minutes, add 2 to 3 g nitrilotriacetic acid into the beaker and continue to stir and react for 30 to 45 minutes to obtain a mixed solution; pour the mixed solution into a stainless steel reactor with a polytetrafluoroethylene liner, seal the reactor and put the reaction The kettle was placed in a constant temperature box with a set temperature of 160-200°C for 20-24 hours. After cooling to room temperature naturally, the obtained green powder sample was collected in a centrifuge tube and washed by centrifugation with deionized water and absolute ethanol for 3-24 hours. After 4 times, dry in a constant temperature box with a set temperature of 60-80°C for 10-12 hours to obtain a nanorod precursor; dissolve 0.8-1.0 g of sodium st...

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Abstract

The invention discloses a preparation method of a quick response type gas sensitive material and belongs to the technical field of sensor material preparation. According to the preparation method, a sodium stannate solution undergoes a reaction under hydrothermal conditions to produce tin oxide nanoparticles, the porous hollow ball powder comprises nickel oxide-embedded tin oxide porous hollow spheres, and in an initial aqueous alcohol solution, a small amount of Ni groups and NTA- are dispersed in and modify the spherical structures. The water molecule-linked ethanol molecules can reduce thedielectric constant of the solution and produce a strong electrostatic reaction in the solution. The ethanol molecules in the solution reduce discontinuous clusters in the hydrogen bond framework in the system so that a space depletion layer with few electrons and holes is produced at the p-n junction. The semiconductor resistance is significantly increased in the gas sensitive material and high heat is produced under a certain voltage to improve the temperature of the gas sensitive material so that the desorption efficiency of gas molecules is improved, the response recovery time is reduced and an application prospect is widened.

Description

technical field [0001] The invention discloses a preparation method of a fast-response gas-sensitive material, which belongs to the technical field of sensor material preparation. Background technique [0002] The rapid development of modern industry has made the problem of air pollution more and more serious. People are paying more and more attention to the air condition, which has promoted the development of gas-sensitive materials and components. At present, there are many kinds of semiconductor metal oxide gas sensitive materials used for gas monitoring, and the common ones are ZnO, WO 3 , SnO 2 and In 2 o 3 Wait. These semiconducting metal oxides have been widely studied due to their low cost, high stability, and high selectivity, and are widely used in various fields such as industry, defense, agriculture, electronics, and information. Among many metal oxides, the unique structure and properties of vanadium oxide have attracted extensive attention in lithium-ion b...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 吴刚何伟仁陈可
Owner 吴刚
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