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Silver-modified micron tubular indium oxide nitrogen dioxide gas-sensitive material and preparation method thereof

A nitrogen dioxide, indium oxide technology, applied in the direction of analyzing materials, material analysis by electromagnetic means, measuring devices, etc., can solve problems such as reducing the working temperature of gas-sensitive materials, and achieve faster response recovery speed, enhanced sensitivity, and improved electronic The effect of the exchange reaction

Pending Publication Date: 2021-12-03
恩拓必(临沂)能源发展有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of ensuring relatively high sensitivity, there is still a lot of room for research on reducing the working temperature of gas-sensitive materials.

Method used

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  • Silver-modified micron tubular indium oxide nitrogen dioxide gas-sensitive material and preparation method thereof
  • Silver-modified micron tubular indium oxide nitrogen dioxide gas-sensitive material and preparation method thereof
  • Silver-modified micron tubular indium oxide nitrogen dioxide gas-sensitive material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a silver-modified micron tubular indium oxide nitrogen dioxide gas-sensitive material:

[0029] (1) Dissolve 0.179g of 1,4-terephthalic acid in 60mL of N,N-dimethylformamide (DMF), stir until it becomes a transparent solution, then add 0.383g of indium nitrate hydrate (In(NO 3 ) 3 ·3H 2O) Disperse, sonicate until dissolved. The above solution was moved into a reactor, and the reactor was placed in an oven at 100°C for reaction heat synthesis for 4 hours, centrifuged, washed and dried at 80°C for 24 hours to obtain a precursor of micron tubular indium oxide.

[0030] (2) The precursor of micron tubular indium oxide prepared in step (1) was heated to 450° C. at a heating rate of 5° C. / min, and calcined for 4 hours to obtain micron tubular indium oxide.

[0031] (3) Weigh 80 mg (0.288 mmol) of the micron tubular indium oxide prepared in step (2) and disperse it in 100 mL of silver nitrate (concentration of silver nitrate is 0.5 mmol / L) and 1.5 mL ...

Embodiment 2

[0036] (1) Dissolve 0.45g of 1,4-terephthalic acid in 80mL of N,N-dimethylformamide (DMF), stir until it becomes a transparent solution, then add 0.96g of indium nitrate hydrate (In(NO 3 ) 3 ·3H 2 O) Disperse, sonicate until dissolved. The above solution was moved into a reactor, and the reactor was placed in an oven at 100°C for thermal synthesis for 14 hours, centrifuged, washed and dried at 80°C for 24 hours to obtain a precursor of micron tubular indium oxide.

[0037] (2) The precursor of micron tubular indium oxide prepared in step (1) was heated up to 475° C. at a heating rate of 2° C. / min, and calcined for 5 hours to obtain micron tubular indium oxide.

[0038] (3) Weigh 80 mg of micron tubular indium oxide prepared in step (2) and disperse it in 90 mL of silver nitrate (concentration of silver nitrate is 0.5 mmol / L) and 2 mL of sodium citrate (concentration of sodium citrate is 30 mmol / L) In the mixed solution, stir for 30min until fully dissolved to obtain solutio...

Embodiment 3

[0040] (1) Dissolve 0.21g of 1,4-terephthalic acid in 70mL of N,N-dimethylformamide (DMF), stir until it becomes a transparent solution, then add 0.45g of indium nitrate hydrate (In(NO 3 ) 3 ·3H 2 O) Disperse, sonicate until dissolved. The above solution was moved into a reaction kettle, and the reaction kettle was placed in an oven at 90°C for 24 hours of thermal synthesis, centrifuged, washed and dried at 80°C for 24 hours to obtain a precursor of micron tubular indium oxide.

[0041] (2) The precursor of the micron tubular indium oxide prepared in step (1) was heated up to 500° C. at a heating rate of 4° C. / min, and calcined for 4 hours to obtain the micron tubular indium oxide.

[0042] (3) Weigh 80 mg of micron tubular indium oxide prepared in step (2) and disperse them in 70 mL of silver nitrate (concentration of silver nitrate is 0.5 mmol / L) and 1.5 mL of sodium citrate (concentration of sodium citrate is 30 mmol / L) ) in the mixed solution, stirred for 30min until fu...

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Abstract

The invention discloses a silver-modified micron tubular indium oxide nitrogen dioxide gas-sensitive material and a preparation method thereof, and belongs to the technical field of sensing materials and preparation thereof. The preparation method of the nitrogen dioxide gas-sensitive material specifically comprises the following steps: dissolving 1, 4-terephthalic acid in N, N-dimethylformamide, adding indium salt, uniformly dispersing, performing thermal synthesis and calcining to obtain micron tubular indium oxide, dispersing the micron tubular indium oxide in a mixed solution of silver nitrate and sodium citrate, and dropwise adding a sodium borohydride solution to obtain the silver-modified micron tubular indium oxide nitrogen dioxide gas-sensitive material. The silver-modified micron tubular indium oxide prepared by the invention has relatively high sensitivity to NO2 at room temperature, and is a high-performance gas sensitive material with potential application value.

Description

technical field [0001] The invention relates to the technical field of sensing materials and preparation thereof, in particular to a silver-modified micron tubular indium oxide nitrogen dioxide gas-sensitive material and a preparation method thereof. Background technique [0002] Nitrogen dioxide (NO 2 ), mainly emitted by automobiles and industrial fuel combustion, is a toxic gas that is considered harmful to the environment and human health. Humans are continuously and frequently exposed to low concentrations of NO 2 Sometimes, the respiratory system will also be damaged, causing respiratory distress, pulmonary edema and bronchitis and other diseases. According to the latest ambient air quality standards, the concentration limits of air pollutants including nitrogen oxides are all below one part per million (ppm). In addition, NO 2 It is also a precursor of some harmful secondary air pollutants, including nitric acid, the nitrate moiety in secondary inorganic aerosols,...

Claims

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Application Information

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IPC IPC(8): G01N27/00
CPCG01N27/00
Inventor 肖松
Owner 恩拓必(临沂)能源发展有限责任公司
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