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Composite gas-sensitive material and preparation method thereof, and ethanol gas sensor and preparation method thereof

A gas sensor and gas-sensitive material technology, which is applied in the fields of analyzing materials, material resistance, and material analysis by electromagnetic means. It can solve the problems of low selectivity, poor sensitivity and stability, and inability to meet the needs of gas sensors. The effect of specific surface area

Pending Publication Date: 2021-07-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cobalt tetroxide gas-sensing materials currently used in ethanol gas sensors have low selectivity to ethanol, poor sensitivity and stability, and cannot meet the current needs of gas sensors.

Method used

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  • Composite gas-sensitive material and preparation method thereof, and ethanol gas sensor and preparation method thereof
  • Composite gas-sensitive material and preparation method thereof, and ethanol gas sensor and preparation method thereof
  • Composite gas-sensitive material and preparation method thereof, and ethanol gas sensor and preparation method thereof

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preparation example Construction

[0033] The preparation method of the metal-organic framework derivative-trititanium dicarbide composite gas-sensing material comprises the following steps:

[0034] S1, stirring and dissolving a certain amount of metal salt hydrate in a solvent to obtain a mixed solution A;

[0035] The mass ratio of the metal salt hydrate to the solvent is 1:(50-150).

[0036] S2. Adding a metal-organic framework precursor to the above mixed solution A to obtain a mixed solution B;

[0037] The mass ratio of the metal-organic framework precursor to the solvent is 1: (100-200).

[0038] S3. Add a certain amount of trititanium dicarbide to the above mixed solution B, and ultrasonically obtain the mixed solution C for 1 hour, and let it stand for precipitation at room temperature for 24 hours;

[0039] The mass ratio of the trititanium dicarbide to the metal-organic framework precursor is 1: (1-100).

[0040] S4. Take out the sediment at the bottom and centrifuge twice in ethanol and deionize...

Embodiment 1

[0054] A method for preparing a metal-organic framework-derived tricobalt tetroxide-trititanium dicarbide composite gas-sensing material, comprising the following steps:

[0055] S1. Stir and dissolve cobalt nitrate hexahydrate in methanol solution to obtain mixed solution A. The mass ratio of cobalt nitrate hexahydrate to methanol is 1:50.

[0056] S2. Add 2-methylimidazole to mixed solution A to obtain mixed solution B. The mass ratio of 2-methylimidazole to methanol is 1:100.

[0057] S3. Add a certain amount of trititanium dicarbide to the mixed solution B, sonicate for 1 hour to obtain the mixed solution C, and let it stand for precipitation at room temperature for 24 hours. The mass ratio of trititanium dicarbide to cobalt nitrate hexahydrate is 1:1.

[0058] S4. After pouring out the supernatant, centrifuge the bottom sediment in ethanol and deionized water twice respectively, and dry the sediment at 60°C for 24 hours to obtain a powder;

[0059] S5. Calcining the obta...

Embodiment 2

[0062] A method for preparing a metal-organic framework-derived zinc oxide-trititanium carbide composite gas-sensing material, comprising the following steps:

[0063] S1. Stir and dissolve zinc nitrate hexahydrate in methanol solution to obtain mixed solution A. The mass ratio of cobalt nitrate hexahydrate to methanol is 1:100.

[0064] S2. Add 2-methylimidazole to mixed solution A to obtain mixed solution B. The mass ratio of 2-methylimidazole to methanol is 1:150.

[0065] S3. Add a certain amount of trititanium dicarbide to the mixed solution B, sonicate for 1 hour to obtain the mixed solution C, and let it stand for precipitation at room temperature for 24 hours. The mass ratio of trititanium dicarbide to zinc nitrate hexahydrate is 1:40.

[0066] S4. After pouring out the supernatant, centrifuge the bottom sediment in ethanol and deionized water twice respectively, and dry the sediment at 60°C for 24 hours to obtain a powder;

[0067] S5. Calcining the obtained powder i...

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Abstract

According to the composite gas-sensitive material and the preparation method thereof, and the ethanol gas sensor and the preparation method thereof disclosed by the invention, a trititanium carbide material and a cobaltosic oxide material derived from a metal organic framework are combined and applied to the gas sensor; the interdigital electrode is coated with a cobaltosic oxide-trititanium carbide composite material coating film derived from a metal organic framework, so that the gas-sensitive response of traditional cobaltosic oxide to ethanol is greatly enhanced, the selectivity to ethanol is improved, the sensitivity is high, and the highest sensitivity to 50 ppm ethanol can reach 185. Compared with a traditional cobalt oxide gas sensor, the sensitivity of the cobalt oxide gas sensor is improved by 15 times, even if the gas concentration is 1 ppm, detection can be conducted, the response speed is high, and good repeatability and stability are achieved.

Description

technical field [0001] The invention relates to the field of gas sensor preparation, in particular to a composite gas sensitive material and a preparation method, an ethanol gas sensor and a preparation method. Background technique [0002] Ethanol is a volatile gas, flammable, and its vapor can form an explosive mixture with air, which poses a safety hazard. At the same time, ethanol gas will damage multiple organs of the human body, affect the human gastrointestinal tract function, liver function and even cause central nervous system damage and hematopoietic dysfunction. When the concentration reaches a certain level, it will cause strong discomfort to the human body. significance. [0003] Cobalt tetroxide gas-sensing materials derived from metal-organic frameworks have a porous structure compared to traditional metal oxides, can absorb more gas molecules, and are cheap, and have attracted extensive attention from researchers in gas sensing. However, the cobalt tetroxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127G01N27/126Y02A50/20
Inventor 刘卫华马发卜祥瑞吴海洋李昕韩传余王小力
Owner XI AN JIAOTONG UNIV
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