Preparation method of nanometer composite film ammonia gas sensor

An ammonia gas sensor and nanocomposite technology, applied in the direction of material resistance, can solve the problems of poor ammonia gas selectivity, poor stability of sensitive membrane, low sensitivity, etc., and achieve low recovery time, good detection sensitivity, and response-recovery characteristics. quick effect

Inactive Publication Date: 2012-11-21
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing ammonia sensors made of gas-sensitive materials generally have the following defects: 1. The selectivity to ammonia is poor and the sensitivity is not high; 2. It usually cannot work at room temperature, and the sensitive film needs to be specially heated to work; 3. 1. The production technology of sensitive film mostly adopts general physical method, and the obtained sensitive film has poor stability.

Method used

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  • Preparation method of nanometer composite film ammonia gas sensor
  • Preparation method of nanometer composite film ammonia gas sensor
  • Preparation method of nanometer composite film ammonia gas sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of a nanocomposite film ammonia sensor, the steps are as follows:

[0022] 1) Take 18.6 parts by weight of aniline monomer, disperse it into deionized water, add 0.3 parts by weight of graphene sheet, stir and mix until uniform;

[0023] 2) in the mixed liquor that 1) step obtains, add the hydrochloric acid solution of 900 parts of weight 1 mol / liter, be placed in ice-water bath and continue to stir for 30 minutes; Add the ammonium persulfate solution containing the ammonium persulfate of 456 parts weight immediately, Continue stirring reaction in ice-water bath for 15 hours;

[0024] 3) Take the precipitate by filtration, wash it with deionized water and alcohol, and dry it for 24 hours to obtain a dry powder; then disperse the powder in an alcohol solution with a concentration of 30% (v / v), and obtain a uniform dispersion after ultrasonication for 3 hours liquid;

[0025] 4) Coat the dispersion liquid obtained in step 3) on the interdigital elec...

Embodiment 2

[0030] A preparation method of a nanocomposite film ammonia sensor, the steps are as follows:

[0031] 1) Take 18 parts by weight of aniline monomer, disperse it in deionized water, then add 0.1 part by weight of graphene, stir and mix until uniform;

[0032] 2) add 700 parts of heavy 1 mol / liter hydrochloric acid solution in the mixed liquor that 1) step obtains, place in ice-water bath and continue to stir for 20 minutes; Then add the ammonium persulfate solution containing 456 parts of heavy ammonium persulfate, Placed in an ice-water bath and continued stirring for 14 hours;

[0033] 3) Take the precipitate by filtration, wash it with deionized water and alcohol, and dry it for 30 hours to obtain a dry powder; then disperse the powder in an alcohol solution with a concentration of 15% (v / v), and obtain a uniform dispersion after ultrasonication for 4 hours liquid;

[0034] 4) Coat the dispersion liquid obtained in step 3) on the interdigital electrodes; after the alcohol...

Embodiment 3

[0036] A preparation method of a nanocomposite film ammonia sensor, the steps are as follows:

[0037] 1) Take 20 parts by weight of aniline monomer, disperse it in deionized water, add 3 parts by weight of graphene, stir and mix until uniform;

[0038] 2) in the mixed liquor that 1) step obtains, add the hydrochloric acid solution of 1000 parts of weight 1 mol / liter, be placed in ice-water bath and continue to stir 40 minutes; Add the ammonium persulfate solution containing the ammonium persulfate of 456 parts of weight immediately, Placed in an ice-water bath and continued stirring for 18 hours;

[0039] 3) Take the precipitate by filtration, wash it with deionized water and alcohol, and dry it for 72 hours to obtain a dry powder; then disperse the powder in an alcohol solution with a concentration of 40% (v / v), and obtain a uniform dispersion after ultrasonication for 5 hours liquid;

[0040] 4) Coat the dispersion liquid obtained in step 3) on the interdigital electrodes...

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Abstract

A preparation method of a nanometer composite film ammonia gas sensor comprises the following steps: 1, taking 18-20 parts by weight of aniline monomers, dispersing the aniline monomers into deionized water, adding 0.1-3 parts by weight of graphene, and uniformly stirring; 2, adding 700-1000 parts by weight of 1mol / L hydrochloric acid to the mixed solution obtained in step 1, placing the obtained solution in an ice water bath, continuously stirring for 20-40min, adding a solution containing 456 parts by weight of ammonium persulfate, placing in the ice water bath, and reacting for 14-18h under stirring; 3, filtering, taking the obtained precipitate, respectively washing with the deionized water and alcohol, drying for 24-72h to obtain dry powder, dispersing the powder in an alcohol solution with the concentration of 15-40% (v / v), and carrying out ultrasound for 3-5h to obtain a uniform dispersion; and 4, coating the dispersion on an interdigital electrode, and obtaining the nanometer composite film ammonia gas sensor after the alcohol solution volatilizes. The sensor prepared through the preparation method has the advantages of high detection sensitivity, good stability, no need of a heating part, and realization of working at room temperature.

Description

technical field [0001] The invention relates to a preparation method of a nanocomposite film ammonia sensor. Background technique [0002] Ammonia is an alkaline substance. Although it exists in the atmosphere at a low concentration, it still has strong irritation to the mouth, nasal membrane, upper respiratory tract and skin tissue of animals and humans. It can absorb moisture in skin tissue , to denature tissue proteins, saponify tissue fat, and destroy the structure of cell membranes, and under certain conditions, ammonia gas is also highly corrosive to substances in the environment. Therefore, even a low concentration of ammonia in the environment can cause hazards and adverse effects on human health. Therefore, how to quickly and accurately detect the content of ammonia in the environment and provide the necessary scientific basis for the governance of the air environment has very important practical significance. In the 1860s, it was discovered that semiconductor oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
Inventor 陈向东邬祖全朱世步周祚万丁星
Owner SOUTHWEST JIAOTONG UNIV
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