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Polystyrene sulfonic acid-doped and polyaniline composite flexible membrane-based high-efficiency ammonia sensor and preparation method thereof

A polystyrene sulfonic acid, ammonia gas sensor technology, applied in instruments, scientific instruments, measuring devices, etc., can solve the problems of low sensor sensitivity, complex manufacturing, poor stability, etc., and achieve high sensitivity, reduced power consumption, and high stability. sexual effect

Pending Publication Date: 2020-01-21
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sensors manufactured by this method have disadvantages such as low sensitivity, poor stability, and complicated manufacturing.

Method used

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  • Polystyrene sulfonic acid-doped and polyaniline composite flexible membrane-based high-efficiency ammonia sensor and preparation method thereof
  • Polystyrene sulfonic acid-doped and polyaniline composite flexible membrane-based high-efficiency ammonia sensor and preparation method thereof
  • Polystyrene sulfonic acid-doped and polyaniline composite flexible membrane-based high-efficiency ammonia sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) The polyvinylidene fluoride porous membrane was ultrasonically cleaned in acetone and ethanol for 20 minutes respectively, and then heat-treated in an electric blast drying oven at 80°C for 20 minutes;

[0030] (2) Prepare 100ml of hydrochloric acid with a concentration of 1M, then add 0.3g of aniline and ultrasonically shake for 50 minutes, put the polyvinylidene fluoride porous membrane into the solution, and then put the solution into ice water to obtain solution A;

[0031] (3) Prepare 20ml of 1M hydrochloric acid, then add 0.9g of ammonium persulfate and ultrasonically shake for 10 minutes, add the obtained solution to solution A, and keep it in ice water for 20 hours to react;

[0032] (4) Take out the polyvinylidene fluoride porous membrane, rinse it with deionized water, and then heat-treat it at 80°C for 20 minutes;

[0033] (5) Prepare 200 ml of 1% PSS aqueous solution by mass fraction, and soak the polyvinylidene fluoride porous membrane obtained in the p...

Embodiment 2

[0038] (1) The polyimide film was ultrasonically cleaned in acetone and ethanol for 20 minutes, and then heat-treated in an electric blast drying oven at 80°C for 20 minutes.

[0039] (2) Prepare 100ml of hydrochloric acid with a concentration of 1M, then add 0.8g of aniline and ultrasonically shake for 100 minutes, put the polyvinylidene fluoride porous membrane into the solution, and then put the solution into ice water to obtain solution A.

[0040] (3) Prepare 20ml of 1M hydrochloric acid, then add 1.3g of ammonium persulfate and ultrasonically shake for 10 minutes, add the obtained solution to solution A, and keep it in ice water for 10 hours to react.

[0041] (4) The polyimide film was taken out, rinsed with deionized water, and then heat-treated at 100° C. for 20 minutes.

[0042] (5) Prepare 200ml of 10% PSS aqueous solution by mass fraction, soak the polyvinylidene fluoride porous membrane obtained in the previous step in the PSS solution for 6h;

[0043] (6) The po...

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PUM

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Abstract

The invention discloses a polystyrene sulfonic acid-doped polyaniline composite flexible membrane-based efficient ammonia sensor, comprising a flexible membrane, a polystyrene sulfonic acid-doped polyaniline layer and an interdigital electrode layer. The prepared sensor has high sensitivity, high selectivity and high stability when being used for ammonia detection; according to a preparation method of the sensor, electrical conductivity and gas-sensitive performance of a polyaniline membrane layer can be regulated by regulating and controlling concentrations of aniline, ammonium persulfate andPSS solution; the sensor has the advantages of being miniaturized and working at room temperature, so that power consumption can be reduced; meanwhile, the sensor has the advantages of large scale production and low cost, so that industrial production is facilitated; besides, a residual solution is filtered and dried and polyaniline can be obtained, so that waste is reduced, and cost is saved.

Description

technical field [0001] The invention relates to a gas sensor, in particular to a sensor for detecting ammonia, and to a preparation method thereof. Background technique [0002] Nowadays, the problem of air pollution is undoubtedly affecting the normal production and living activities of human beings. As we all know, ammonia is a serious hazard to human health due to its high toxicity and strong corrosiveness. In addition, in the detection of human respiratory gas components, ammonia is also a potential biomarker for the diagnosis of uremia, duodenal ulcer and other diseases . Therefore, the development of high-performance flexible room temperature gas sensors is of great significance to the fields of environmental detection, human health early warning, and military defense. [0003] Since the relevant gases that reflect the health status of the human body in the breathing gas of the human body generally have low concentration and complex composition factors, there are hig...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 沈文锋吕大伍宋伟杰谭瑞琴
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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