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Pd-doped rGO/ZnO-SnO2 heterojunction quaternary composite material as well as preparation method and application thereof

A composite material and heterojunction technology, applied in separation methods, analytical materials, material resistance, etc., can solve problems such as poor selectivity, long response/recovery time parameters, small gas response, etc., to improve performance, enrich surface defects, The effect of lowering the response temperature

Active Publication Date: 2021-12-24
AEROSPACE INFORMATION RES INST CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common n-n type heterojunction structure, such as ZnO-SnO 2 , NiO-ZnO and TiO 2 -SnO 2 etc. Compared with single metal oxide materials, n-n heterojunction materials can effectively improve the sensitivity of the sensor and reduce the operating temperature, but there are still small gas response, long response / recovery time parameters and relatively low selectivity. bad question

Method used

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  • Pd-doped rGO/ZnO-SnO2 heterojunction quaternary composite material as well as preparation method and application thereof
  • Pd-doped rGO/ZnO-SnO2 heterojunction quaternary composite material as well as preparation method and application thereof
  • Pd-doped rGO/ZnO-SnO2 heterojunction quaternary composite material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] (1) Dissolve zinc acetate dihydrate and sodium hydroxide in deionized water at a molar ratio of 1:2, and stir them magnetically for 1 hour after mixing; After the reaction, the autoclave was naturally cooled to room temperature; the precipitate was collected after centrifugation, washed alternately with deionized water and ethanol three times, dried at 60°C for 12 hours, and placed in a muffler after drying. In the furnace, the temperature was raised to 500° C. for 2 hours at a rate of 3° C. / min and calcined for 2 hours to obtain flake ZnO nanomaterials.

[0049] (2) Add the flaky ZnO nanomaterial and tin protochloride tetrahydrate into deionized water, after magnetic stirring and mixing, first add DMF, then dropwise add sodium hydroxide solution, then add palladium chloride, magnetic stirring and mixing After being uniform, mixed solution is obtained; Wherein, the mol ratio of flaky ZnO nanometer material, stannous chloride tetrahydrate and sodium hydroxide is 1:2:5; V...

Embodiment 2

[0061] (1) Dissolve zinc acetate dihydrate and sodium hydroxide in deionized water at a molar ratio of 1:4, and stir them magnetically for 1 hour after mixing; After the reaction, the autoclave was naturally cooled to room temperature; the precipitate was collected after centrifugation, washed alternately with deionized water and ethanol three times, dried at 60°C for 12 hours, and placed in a muffler after drying. In the furnace, the temperature was raised to 500°C at a rate of 4°C / min and calcined for 2 hours to obtain sheet ZnO nanomaterials.

[0062] (2) Add the flaky ZnO nanomaterial and tin protochloride tetrahydrate into deionized water, after magnetic stirring and mixing, first add DMF, then dropwise add sodium hydroxide solution, then add palladium chloride, magnetic stirring and mixing After being uniform, mixed solution is obtained; Wherein, the mol ratio of flaky ZnO nanometer material, stannous chloride tetrahydrate and sodium hydroxide is 1:4:8; V DMF :n ZnO =1...

Embodiment 3

[0071] Graphene oxide powder is ZnO and SnO in step (1) in the present embodiment 2 1.5% of the total mass, all the other are the same as in Example 1.

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Abstract

The invention relates to a Pd-doped rGO / ZnO-SnO2 heterojunction quaternary composite material as well as a preparation method and application thereof, and belongs to the technical field of gas sensors. The composite material is secondary particles formed by agglomeration of primary particles, the primary particles take rGO of a two-dimensional net structure as a matrix, the surface of the matrix is coated with sheet nanometer materials ZnO and SnO2, ZnO and SnO2 are compounded to form n-n type heterojunctions, ZnO, SnO2 and rGO respectively form p-n type heterojunctions, and Pd nanoparticles are doped in ZnO, SnO2 and rGO. The method comprises the following steps: firstly, mixing a flaky ZnO nano material and stannous chloride in water, sequentially adding DMF, sodium hydroxide and palladium chloride to obtain a mixed solution, then carrying out hydrothermal reaction on the mixed solution and a graphene oxide dissociation solution, and finally calcining. The composite material has the characteristics of high selectivity, quick response and low-concentration detection when being used in the hydrogen sensor.

Description

technical field [0001] The invention relates to a Pd-doped rGO / ZnO-SnO 2 The invention relates to a heterojunction quaternary composite material, a preparation method and an application thereof, belonging to the technical field of gas sensors. Background technique [0002] Hydrogen (H 2 ) is a colorless, odorless, tasteless, renewable, non-polluting, flammable and explosive gas with high combustion heat (142KJ / g), low minimum ignition energy (0.0017mJ) and wide The flammable range (4%~75%), high burning speed, is considered to be one of the best clean energy carriers, and has been widely used in aerospace, petrochemical and biomedicine. However, due to its own characteristics, the accidental leakage of hydrogen during production, use, and transportation is an important safety issue, especially when the hydrogen concentration exceeds 4%, it will have high explosion sensitivity and danger. Therefore, rapid and accurate on-site analysis and on-line monitoring of low-concentr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01G9/02C01G19/02B82Y30/00G01N27/12B01J20/06B01J20/28B01D53/02
CPCC01B32/184C01G9/02C01G19/02B82Y30/00G01N27/127G01N27/12B01J20/06B01J20/28033B01J20/28007B01D53/02C01P2004/80C01P2004/64C01P2004/24C01P2004/45C01P2006/40Y02E60/50
Inventor 孙建海张新晓陈婷婷马天军赵佩月
Owner AEROSPACE INFORMATION RES INST CAS
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