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Self-heating gas sensor, gas sensitive material and preparation method and application thereof

A gas sensor and gas-sensitive material technology, applied in the field of materials, can solve the problems of slow adsorption and desorption process, expensive instruments, cumbersome sensor preparation methods, etc., and achieve the effect of fast response recovery and low power consumption

Pending Publication Date: 2021-10-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both methods currently have corresponding disadvantages
1. Although carbon materials such as graphene and carbon nanotubes can produce gas response at room temperature, their response recovery speed is slow due to the slow gas adsorption and desorption process at room temperature, which cannot meet the needs of people in real life. needs
2. At present, the self-heating gas sensors using the principle of Joule heat mainly use single or oriented metal or metal oxide nanowires or nanobelts. The preparation methods of these sensors are cumbersome and the instruments are expensive.
Moreover, the resistance is large, and a high voltage must be applied to heat the gas-sensitive material to the ideal temperature
This will increase the size of the battery, which is not conducive to the miniaturization and portability of the sensor

Method used

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  • Self-heating gas sensor, gas sensitive material and preparation method and application thereof
  • Self-heating gas sensor, gas sensitive material and preparation method and application thereof
  • Self-heating gas sensor, gas sensitive material and preparation method and application thereof

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preparation example Construction

[0054] In a particularly preferred embodiment of the present invention, the preparation method of the gas-sensitive material comprises: in the presence of a solvent, after heat-treating the carbon material, the metal oxide and / or the metal oxide precursor under microwaves, The step of performing solid-liquid separation to obtain a carbon material metal oxide composite nanomaterial (hereinafter also referred to as the first preparation method of the gas-sensing material).

[0055] According to the first preparation method of the gas-sensitive material of the present invention, since the carbon material and the metal oxide and / or metal oxide precursor are heat-treated under microwaves, the raw materials can be heated in a very short time by using microwaves At the same time, the heat is generated by molecular vibration, so the distribution of the reaction heat field is more uniform, and the shape of the product is more uniform, and the carbon material has a high microwave absorpt...

Embodiment 1

[0084] Accurately weigh 15mg of graphene oxide, 1g of tungsten chloride into a 500mL beaker, pour 300mL of absolute ethanol, magnetically stir for about 30min, then use a cell disruptor to sonicate for 30min, and pour the obtained mixed solution into 10 In a 50mL polytetrafluoroethylene reactor, heat it to 200°C with a microwave synthesizer at 800W, and keep the temperature constant for 2h. The product obtained after the reaction was centrifuged and washed three times with deionized water and absolute ethanol. Then put the centrifuged sample into an oven and dry it at 80°C for 6 hours to obtain the reduced graphene WO 3 Nanomaterial A1 (flaky nanomaterial with a thickness of 1-2nm and the longest linear distance between two points is 1-5um), wherein the content of carbon material is 2.5% by weight, the content of metal oxide is 97.5% by weight, The resistance is 40kΩ.

Embodiment 2

[0086] Accurately weigh 15mg of carbon nanotubes, put 1g of tungsten chloride into a 500mL beaker, pour 300mL of absolute ethanol, stir for about 30min with a magnetic force, and then use a cell disruptor to ultrasonically break for 30min, and pour the obtained mixed solution into 10 beakers In a 50mL polytetrafluoroethylene reactor, heat it to 200°C with a microwave synthesizer at 800W, and keep the temperature constant for 2h. The product obtained after the reaction was centrifuged and washed three times with deionized water and absolute ethanol. Then put the centrifuged sample into an oven and dry it at 80°C for 6 hours to obtain carbon nanotube WO 3 Nanomaterial A2 (wire-like nanomaterial with a diameter of 5-15nm and a length of 10-30um), wherein the content of carbon material is 2.5% by weight, the content of metal oxide is 97.5% by weight, and the resistance is 60kΩ.

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Abstract

The invention relates to the field of materials, and discloses a gas-sensitive material and a preparation method and application thereof, and a Joule principle-based self-heating gas sensor using the gas-sensitive material. The gas-sensitive material is a carbon material and metal oxide composite nano material formed by compounding a carbon material and a metal oxide, wherein the content of the carbon material in the carbon material and metal oxide composite nano material is 0.5-20 wt%, and the content of the metal oxide is 80-99.5 wt%. The gas-sensitive material disclosed by the invention is relatively low in resistance, can respond to various gases at a relatively low working temperature, does not need external heating, realizes self-heating only by Joule heat of a measuring circuit, and is relatively low in power consumption.

Description

technical field [0001] The invention relates to the field of materials, in particular to a gas-sensitive material, a preparation method and application thereof, and a self-heating gas sensor based on the Joule principle using the gas-sensitive material. Background technique [0002] In recent years, the problem of environmental pollution has become more and more prominent. Therefore, solving the problem of environmental pollution has become one of the priority issues. Among them, toxic and harmful gases, as one of the important sources of environmental pollution, widely exist in the production, transportation and storage processes of petroleum and chemical enterprises, threatening the health and safety of workers at all times. Therefore, how to quickly and accurately detect the concentration of toxic and harmful gases and ensure personal safety has become one of the urgent problems to be solved in the industry. [0003] One of the effective ways to solve this problem is to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/168C01B32/156C01G41/02C01G49/06C01G9/02C01G19/02C01G3/02C01G15/00C01G39/02B82Y40/00B82Y30/00G01N27/12
CPCC01B32/184C01B32/168C01B32/156C01G41/02C01G49/06C01G9/02C01G19/02C01G3/02C01G15/00C01G39/02B82Y40/00B82Y30/00G01N27/125C01P2004/80G01N27/127C01B32/194C01B32/174C01P2004/03C01P2004/04C01P2004/20C01P2004/16C01P2004/61C01P2004/62C01P2002/77C01P2002/54C01G41/00C01G49/0018C01P2006/40B82Y15/00G01N27/128G01N33/0027
Inventor 安飞李娜孙冰王林胡适张树才
Owner CHINA PETROLEUM & CHEM CORP
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