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Surface cobalt-doped zinc oxide composite material as well as preparation method and application thereof

A composite material, zinc oxide technology, applied in the field of inorganic composite materials, can solve the problems of affected internal crystal lattice structure, low surface catalytic effect, low response value and stability of ethanol gas, etc. easy effect

Active Publication Date: 2019-11-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the cobalt-doped zinc oxide materials prepared in the prior art, the cobalt is doped as a whole, the surface catalytic effect is low, the internal crystal lattice structure is affected, and the response value and stability to ethanol gas are not high.

Method used

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  • Surface cobalt-doped zinc oxide composite material as well as preparation method and application thereof
  • Surface cobalt-doped zinc oxide composite material as well as preparation method and application thereof
  • Surface cobalt-doped zinc oxide composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Weigh 4mmol of zinc nitrate nonahydrate, 4mmol of urea, 0.05g of hexamethylenetetraammonium, add 80mL of deionized water, stir to dissolve for 30 minutes, hydrothermally at 150℃ for 8h, wash and dry in a drying cabinet at 60℃ for 12 hours Obtain precursor materials.

[0067] Weigh 0.01mmol of cobalt nitrate hexahydrate and 0.8mmol of urea, add 80mL of deionized water, stir to dissolve for 15 minutes, add the precursor material, sonicate for 5 minutes to uniformly disperse, continue to stir for 30 minutes, and then hydrothermally react at 120°C Hours, washing, centrifuging, drying at 60°C for 12 hours, and calcining at 450°C for 2 hours to obtain a surface cobalt-doped zinc oxide composite material.

[0068] Put 10 mg of the obtained surface cobalt-doped zinc oxide composite material into a mortar, add 2 mL of ethanol and grind until a completely dispersed sample slurry is obtained, and the slurry is evenly covered on 13.6×7.0mm Ag-Pd alumina by the drip coating method The c...

Embodiment 2

[0071] Weigh 4mmol of zinc nitrate nonahydrate, 4mmol of urea, 0.05g of cetyltrimethylammonium bromide, add 80mL of deionized water, stir and dissolve for 15 minutes, hydrothermally at 120°C for 12h, wash and place in a drying cabinet at 60°C The precursor material was obtained by drying for 12 hours.

[0072] Weigh 0.04mmol of cobalt nitrate hexahydrate and 0.8mmol of urea, add 80mL of deionized water, stir to dissolve for 30 minutes, add the precursor material, sonicate for 5 minutes to uniformly disperse, continue to stir for 30 minutes, and then hydrothermally react at 80°C for 10 Hours, washing, centrifugation, drying at 60°C for 12 hours, and calcination at 350°C for 3 hours to obtain a surface cobalt-doped zinc oxide composite material.

[0073] Put 10 mg of the obtained surface cobalt-doped zinc oxide composite material into a mortar, add 2 mL of ethanol and grind until a completely dispersed sample slurry is obtained, and the slurry is evenly covered on 13.6×7.0mm Ag-Pd al...

Embodiment 3

[0076] Weigh 4mmol of zinc nitrate nonahydrate, 4mmol of urea, and 0.05g of polyvinylpyrrolidone, add 80mL of deionized water, stir and dissolve for 30 minutes, then hydrothermally heat at 140°C for 12 hours, wash and dry in a drying cabinet at 60°C for 12 hours to obtain precursor materials .

[0077] Weigh 0.12mmol of cobalt nitrate hexahydrate and 0.8mmol of urea, add 80mL of deionized water, stir to dissolve for 15 minutes, add the precursor material, sonicate for 5 minutes to uniformly disperse, continue to stir for 30 minutes, and then hydrothermally react at 120℃5 Hours, washing, centrifugation, drying at 60°C for 12 hours, and calcination at 550°C for 2 hours to obtain a surface cobalt-doped zinc oxide composite material.

[0078] Put 10 mg of the obtained surface cobalt-doped zinc oxide composite material into a mortar, add 2 mL of ethanol and grind until a completely dispersed sample slurry is obtained, and the slurry is evenly covered on 13.6×7.0mm Ag-Pd alumina by the d...

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Abstract

The invention provides a surface cobalt-doped zinc oxide composite material as well as a preparation method and application thereof, and belongs to the field of inorganic composite materials. The method provided by the invention adopts a simple and convenient hydrothermal process to realize Co doping on the surface of zinc oxide through a two-step hydrothermal process to prepare the surface cobalt-doped zinc oxide material, realizes effective doping of the surface of a substrate material, improves the problems that an overall doping method in a past research and technology has a low surface catalytic effect and an internal crystal lattice structure is affected, has the advantages of being simple and having a safe preparation process and reaction solvent, and prepares the material which has multi-level structural characteristics and a uniform overall morphology and is composed of nanoparticles, and the doping addition amount of cobalt on the surface is <=3 wt%.

Description

Technical field [0001] The invention relates to the technical field of inorganic composite materials, in particular to a surface cobalt-doped zinc oxide composite material and a preparation method and application thereof. Background technique [0002] Ethanol is the most common flammable and explosive gas in industrial production. At the same time, in order to prevent traffic accidents caused by drunk driving, ethanol is also the test gas to determine the standard for drunk driving. At the same time, people are prone to headaches, nausea, mucosal irritation and other symptoms when they are exposed to high concentrations of ethanol for a long time. With the demand of industrial development and the improvement of people's life safety awareness, the demand for accurate and rapid detection of ethanol gas in the environment is increasing. The existing ethanol gas sensor has the disadvantages of low detection sensitivity, high minimum detection limit, and high cost. Semiconductor oxi...

Claims

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Application Information

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IPC IPC(8): C01G9/02G01N27/30
CPCC01G9/02G01N27/30
Inventor 韩冬梅张丰茂王志华
Owner BEIJING UNIV OF CHEM TECH
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