Metal oxide/polyaniline composite resistor-type gas-sensitive element and preparation method thereof

A technology of gas-sensing components and composite resistors, applied in the direction of material resistance, etc., can solve the problems of poor adhesion, gas-sensing material falling off, limitation, etc., and achieve the effects of low cost, short response time, and short recovery time.

Active Publication Date: 2013-01-02
泰安市鸿茂商贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since polyaniline is easily decomposed above 300°C, the gas-sensitive material compounded with polyaniline and tin dioxide and other metal oxides cannot be sintered at high temperature. The adhesion of the sheet is very poor, and the gas-sensitive material is easy to fall off from the substrate, thus limiting the application of this type of composite gas-sensitive material

Method used

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  • Metal oxide/polyaniline composite resistor-type gas-sensitive element and preparation method thereof
  • Metal oxide/polyaniline composite resistor-type gas-sensitive element and preparation method thereof
  • Metal oxide/polyaniline composite resistor-type gas-sensitive element and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Using solvent hot pressing method to prepare SnO 2 Porous nano-solid; SnO was prepared by solvent hot pressing method 2 Porous nanosolids; with SnO 2 Nano-powder is used as raw material and pore-forming agent 1,4-dioxane is ground to make a slurry, and the slurry is put into a solvent hot-pressed reaction kettle, and the temperature and pressure are kept at 150-250°C and 50-90MPa for 2 -5 hours, and then the autoclave is cooled to room temperature to obtain SnO 2 porous nanosolids;

[0054] (2) SnO 2 Porous nano solids ground to 3-6μm, according to 1gSnO 2 The ratio of porous nano-solid to 2ml deionized water is made into a slurry; the slurry is coated on an aluminum oxide ceramic tube (i.e. substrate 1) with a gold electrode 3, a platinum lead 4, and a heating wire 5 inside; Then sinter the aluminum oxide ceramic tube coated with the slurry at a high temperature of 600-700°C, so that a layer of SnO with a thickness of 50-200 μm is attached to the aluminum oxid...

Embodiment 2

[0058] (1) Prepare SnO by the method in Example 1 2 porous nanosolids;

[0059] (2) SnO 2 Porous nano solids ground to 0.5-3μm, according to 1gSnO 2 The ratio of porous nano-solid to 2.5ml deionized water is made into a slurry; the slurry is coated on an aluminum oxide ceramic tube (ie substrate 1) with a gold electrode 3, a platinum lead 4, and a heating wire 5 inside ; Then sinter the aluminum oxide ceramic tube coated with the slurry at a high temperature of 600-700 ° C, so that a layer of SnO with a thickness of 10-200 μm is attached to the aluminum oxide ceramic tube 2 porous thick film;

[0060] (3) Grind polyaniline to 10-100 μm, fully dissolve polyaniline in a mixed solvent of N-methylpyrrolidone (NMP) and deionized water according to the ratio of 1g:15ml (N-methylpyrrolidone and deionized water The molar ratio is 10:1), and then evenly coated with the SnO obtained in step (2) 2 On the porous thick film, let it dry naturally for 24 hours until the solvent evapora...

Embodiment 3

[0063] (1) Prepare SnO by the method in Example 1 2 porous nanosolids;

[0064] (2) SnO 2 Porous nano-solid ground to 6-9μm, according to 1gSnO 2 The ratio of porous nano-solid to 1.5ml deionized water is made into a slurry; the slurry is coated on an aluminum oxide ceramic tube (that is, a substrate 1) with a gold electrode 3, a platinum lead 4, and a heating wire 5 inside ; Then sinter the aluminum oxide ceramic tube coated with the slurry at a high temperature of 600-700 ° C, so that a layer of SnO with a thickness of 50-300 μm is attached to the aluminum oxide ceramic tube 2 porous thick film;

[0065] (3) Grind polyaniline to 10-100 μm, fully dissolve polyaniline in a mixed solvent of N-methylpyrrolidone (NMP) and deionized water according to the ratio of 1g:5ml (N-methylpyrrolidone and deionized water The molar ratio is 4:1), and then evenly coated with the SnO obtained in the above step (2) 2 On the porous thick film, let it dry naturally for 24 hours until the sol...

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Abstract

The invention belongs to the field of gas-sensitive material preparation, and especially relates to a metal oxide / polyaniline composite resistor-type gas-sensitive element and a preparation method thereof. According to the invention, a metal oxide porous nano-grade solid is grinded; deionized water is added and a slurry is prepared; the slurry is coated on a substrate; high-temperature sintering is carried out, and a porous thick film is formed; doped polyaniline is grinded and is prepared into a slurry with an added solvent; the slurry is coated on the porous thick film; the material is naturally dried in the air, such that a gas-sensitive material composite coating is formed, and the gas-sensitive element is prepared. According to the metal oxide / polyaniline composite resistor-type gas-sensitive element provided by the invention, the adhesiveness between the porous thick film and the substrate, and between the porous thick film and polyaniline is good, and falling is prevented. The gas-sensitive element has the advantages of good selectivity, high sensitivity, short response time, short recovery time, good recovery performance, low cost, and simple preparation method. Especially, the gas-sensitive element is used for detecting low-concentration nitrogen oxide gas.

Description

technical field [0001] The invention relates to a metal oxide / polyaniline composite resistance gas sensor and a preparation method thereof, belonging to the field of gas sensor preparation. Background technique [0002] Gas sensors are mostly used to detect flammable and explosive gases such as carbon monoxide, hydrogen, methane, city gas, and liquefied petroleum gas, as well as toxic gases such as nitrogen oxides, ammonia, hydrogen sulfide, and organic volatile vapors such as benzene and toluene. Explosions, fires and safety accidents caused by the leakage of these toxic and harmful gases seriously threaten people's lives and property safety. Therefore, it is necessary to quickly and accurately detect and monitor these gases. [0003] Gas-sensing materials are the core of gas-sensing sensors, so selecting and optimizing gas-sensing materials, developing and applying new functional gas-sensing materials have always been hot spots in sensor research. [0004] Considering SnO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 徐红燕陈兴桥曹丙强
Owner 泰安市鸿茂商贸有限公司
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