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A microporous hollow nickel oxide gas-sensitive sensing material and device for selective adsorption of formaldehyde and its preparation and application

A sensing material and selective technology, which is applied in nickel oxide/nickel hydroxide, material resistance, analytical materials, etc., can solve the problem of not synthesizing NiO porous hollow sphere structure, so as to improve the gas response rate, increase the active vacancies, The effect of stable performance

Active Publication Date: 2019-01-01
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As far as we know, there is no report on the synthesis of NiO porous hollow spheres

Method used

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  • A microporous hollow nickel oxide gas-sensitive sensing material and device for selective adsorption of formaldehyde and its preparation and application
  • A microporous hollow nickel oxide gas-sensitive sensing material and device for selective adsorption of formaldehyde and its preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Weigh 1g of nanocellulose dissolved in 20ml of water and put it into a mixed solution of deionized water and DMSO, stir at room temperature for 20min, add 0.0580g of nickel nitrate and 0.1402g of HMTA; put the beaker into a drying oven at 60°C for 24 hours ;When the temperature of the reaction kettle drops to room temperature, wash the green suspension with alcohol and water for 3-5 times respectively; put it into a muffle furnace and heat it up to 300°C at 5°C / min for 10 hours to obtain microporous hollow nickel oxide balls , the diameter of the hollow sphere is between 1-2 microns ( figure 1 ), put the microporous hollow spheres in alcohol or water for later use; clean the alumina ceramic tubes with deionized water, acetone, and chloroform, dry them, apply the NiO paste evenly on the surface of the ceramic tubes, weld the electrodes, and package them. Aging at 200° C. for 10 days to obtain a gas sensor. The WS-30A gas sensor test system is used to test the response o...

Embodiment 2

[0026] Weigh 1g of nanocellulose and dissolve 20ml of water into a mixed solution of deionized water and DMSO, stir at room temperature for 20min, add 0.0518g of nickel chloride and 0.1402g of HMTA; put the beaker into a dry box at 95°C for 5 Hours; when the temperature of the reactor drops to room temperature, wash the green suspension with alcohol and water for 3-5 times respectively; put it into a muffle furnace and heat it up to 600°C at 10°C / min for 2 hours to obtain microporous hollow nickel oxide Balls, hollow balls with a diameter of 2-2.5 microns, put the microporous hollow balls in alcohol or water for use; clean the alumina ceramic tubes with deionized water, acetone, and chloroform, dry them, and evenly coat the NiO paste Spread on the surface of the ceramic tube, weld the electrodes, package, and age at 300°C for 5 days to obtain the gas sensor. The WS-30A gas sensor test system is used to test the response of different gases with a concentration of 1ppm. It has a...

Embodiment 3

[0028] Weigh 1g of nanocellulose dissolved in 20ml of water and put it into a mixed solution of deionized water and DMSO, stir at room temperature for 20min, 0.1467g of nickel oxalate and 0.5608g of HMTA; put the beaker into a drying oven at 75°C for 12 hours; After the temperature of the reaction kettle drops to room temperature, wash the green suspension with alcohol and water for 3-5 times respectively; put it into a muffle furnace and raise the temperature to 450°C at 3°C / min for 6 hours to obtain microporous hollow nickel oxide balls. The diameter of the hollow sphere is between 2-2.5 microns, and the microporous hollow sphere is placed in alcohol or water for use; the alumina ceramic tube is cleaned with deionized water, acetone, and chloroform, dried, and the NiO paste is evenly coated on the The surface of the ceramic tube is welded with electrodes, packaged, and aged at 250°C for 7 days to obtain a gas sensor. The WS-30A gas sensor test system is used to test the resp...

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Abstract

A micro-porous hollow nickel oxide gas-sensitive material for selectively adsorbing formaldehyde as well as preparation and application thereof, the preparation comprising: dispersing nanocellulose into a mixed solution of de-ionized water and a dispersant; adding a nickel precursor and a slow-release precipitant hexamethyl tetramine after completely dispersing the nanocellulose; placing a beaker full of the solution into a drying oven to heat and carry out reacting so as to obtain a green precipitate; and placing the green precipitate into a crucible to carry out high-temperature calcination so as to obtain the micro-porous hollow nickel oxide gas-sensitive material after cleaning and drying the green precipitate. The prepared nickel oxide may be used for selective detection of formaldehyde gases in the air.

Description

technical field [0001] The invention relates to a gas-sensitive sensing device and a manufacturing method thereof, in particular to a microporous hollow nickel oxide gas-sensitive sensing material for selective adsorption of formaldehyde, as well as its preparation and application. Background technique [0002] Nickel oxide hollow spheres have an adjustable pore structure, high specific surface area and strong ion exchange performance, which is conducive to the reaction of reactants at the active site during the catalytic process, and has shown great promise in the detection of ethanol, acetone, formaldehyde and other gases. It has great application prospects, but the earlier researches are not satisfactory in terms of working temperature, detection limit, and anti-interference. Compared with other nanostructures, the porous hollow sphere structure has a larger specific surface area and more diffusion channels under the same volume, so it has higher sensitivity and rapid res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/04G01N27/00G01N27/12
CPCC01G53/04C01P2004/03C01P2004/34C01P2004/61G01N27/00G01N27/127
Inventor 何丹农张芳林琳葛美英张春明金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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