Composite gas sensitive material, gas sensor and preparation method thereof

A technology of gas sensor and gas-sensing material, applied in chemical instruments and methods, analytical materials, material resistance, etc., can solve problems such as poor gas-sensing performance

Inactive Publication Date: 2019-08-09
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the embodiments of the present application is to provide a composite gas-sensitive material, a gas sensor

Method used

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

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[0032] This embodiment provides a method for preparing a composite gas-sensitive material, including:

[0033] S1. Use templates to assemble graphene materials to form a three-dimensional framework structure, react metal salts and organic ligands on the surface of the three-dimensional framework structure and grow metal-organic frameworks (English full name Metal-Organic Frameworks, English abbreviation MOFs) crystals.

[0034] In a possible embodiment, the method for assembling the graphene material to form a three-dimensional framework by using a template agent includes: dispersing the template agent in water to form an emulsion, and adjusting the pH to acidic. The aqueous dispersion of the graphene material is mixed with the above emulsion to obtain a mixed solution, the mixed solution is filtered or centrifuged, and the filtrate or precipitate is dried to obtain a template / graphene composite material.

[0035] In a possible embodiment, the templating agent is selected from...

Embodiment 1

[0067] This embodiment provides a composite gas-sensing material, which is prepared by the following steps: dispersing 200 nm polystyrene microspheres with deionized water to prepare an emulsion with a solid content of 10 wt%, and adjusting the pH to 2. Mix and disperse 50 mL of graphene aqueous dispersion with a concentration of 1 mg / mL and 25 mL of polystyrene emulsion to obtain a mixed solution, and centrifuge the mixed solution to obtain a three-dimensional polystyrene / graphene composite material (3D PS / G), freeze-dry for 24 hours .

[0068] 2mmolCo(NO 3 ) 2 Dissolve in 50mL methanol to form A solution, and add the prepared 3D PS / G to A solution. Dissolve 10 mmol of methylimidazole in 50 mL of methanol to form solution B, drop solution B into solution A mixed with 3D PS / G, and stir for 5 hours to obtain the reaction product. The reaction product was centrifuged at 8000 rpm / min, and the separated precipitate was vacuum-dried at 60° C. for 6 hours to obtain a dry product....

Embodiment 2

[0072] This embodiment provides a composite gas-sensing material, which is prepared by the following steps: dispersing 500 nm polystyrene microspheres with deionized water to prepare an emulsion with a solid content of 10 wt%, and adjusting the pH to 2. Concentration is 1mg / mL graphene aqueous dispersion 50mL and 50mL polystyrene emulsion are mixed and dispersed to obtain mixed solution, mixed solution is vacuum-filtered and obtained three-dimensional polystyrene / graphene composite material (3D PS / G), at 60 °C for 12 hours.

[0073] 2mmolCoCl 2 Dissolve in 25mL of methanol to form A solution, and add the prepared 3D PS / G to A solution. Dissolve 5 mmol of ethylimidazole in 25 mL of methanol to form solution B, drop solution B into solution A mixed with 3D PS / G, and stir for 3 hours to obtain the reaction product. The reaction product was centrifuged at 8000 rpm / min, and the separated precipitate was vacuum-dried at 60° C. for 6 hours to obtain a dry product.

[0074] The dried...

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Abstract

The invention provides a composite gas sensitive material, a gas sensor and a preparation method thereof and relates to the technical field of nanocomposite materials. A preparation method of the composite gas sensitive material comprises the steps of using a template agent for assembling a graphene material into a three-dimensional framework structure, making a metal salt react with an organic ligand on the surface of the three-dimensional framework structure, and enabling metal organic framework crystals to grow; removing the template agent and then carrying out calcining. A pore structure of the prepared composite gas sensitive material includes micropores, mesopores and macropores. The preparation method of the gas sensor comprises the steps of attaching a dispersion liquid of the composite gas sensitive material to an electrode surface and carrying out drying. The composite gas sensitive material improves the gas sensitive performance of the gas sensor.

Description

technical field [0001] The present application relates to the technical field of nanocomposite materials, in particular, to a composite gas sensitive material, a gas sensor and a preparation method thereof. Background technique [0002] Gas sensors mainly include semiconductor type, electrochemical type, and catalytic combustion type. Among them, the semiconductor gas sensor has the advantages of low cost, high sensitivity, fast response, long life, etc., and is the most practical type of gas sensor. Sensitive materials are the core components of semiconductor gas sensors, which determine the performance indicators of gas sensors. Graphene is expected to become a new type of gas-sensing material due to its excellent electrical conductivity, large specific surface area and ultra-low Johnson noise. However, graphene has poor gas selectivity and is easy to agglomerate, resulting in difficult transport of gas molecules and poor gas-sensing performance. Contents of the invent...

Claims

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Application Information

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IPC IPC(8): C01B32/194G01N27/12G01N27/30
CPCC01B32/194G01N27/125G01N27/30
Inventor 吴丽琼刘兆平张楠王国良
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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