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A method for preparing high-performance gas sensor by carbonization of polyaniline

A gas sensor and sensor technology, applied in the direction of instruments, scientific instruments, air quality improvement, etc., can solve problems such as endangering health, tracheobronchial mucosa damage, etc.

Active Publication Date: 2022-06-03
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ammonia has a wide range of uses, but it also has many dangerous properties. Ammonia is a toxic gas. Inhalation of ammonia gas will also endanger health. When inhaling high concentrations of ammonia, it will cause damage to the trachea, bronchial mucosa and even lungs. emphysema

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  • A method for preparing high-performance gas sensor by carbonization of polyaniline
  • A method for preparing high-performance gas sensor by carbonization of polyaniline
  • A method for preparing high-performance gas sensor by carbonization of polyaniline

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Embodiment 1

[0022] Example 1 A method for preparing high-performance gas sensor by polyaniline carbonization

[0023] The preparation method of polyaniline carbonization gas sensor material includes four stages: preparation of gas sensor material, preparation of gas sensor array, detection of target atmosphere by gas sensor array and identification and distinction of toxic gas.

[0024] a. Dissolve ammonium persulfate and hydrochloric acid in 25 mL of deionized water at a molar ratio of 5:16;

[0025] b. Dissolve 5 mL of aniline in 400 mL of deionized water, and then slowly drop the solution obtained in step a into it, and stir at 25 °C for 19 h under dark conditions; the obtained solution is ultrasonicated with deionized water and centrifuged Separate 6 times;

[0026] c. drying the precipitate obtained in step b at a temperature of 25°C for about 24 hours to obtain a hydrochloric acid-doped polyaniline nano-powder;

[0027] a. Dissolve ammonium persulfate and hydrochloric acid in 25 m...

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Abstract

The invention relates to a method for preparing a gas sensor array based on hydrochloric acid-doped polyaniline nanometer powder carbonized. The device involved in this method is composed of 4 sensors, a ceramic substrate and 8 electrodes, simply using different carbonization times to cause changes in the P and N types of semiconductors, and thus cause differences in detection performance between sensors, and greatly The sensitivity of the gas sensor has been improved. Using the data processing method of radar fingerprints, it can realize rapid (27 seconds) identification and detection of ammonia water, formaldehyde, ethanol and water vapor at room temperature (25°C), which makes up for the low sensitivity and long recovery time of traditional polyaniline sensors. shortcoming. The preparation method of the sensor array involved in the present invention is simple, has the advantage of non-contact identification and detection at room temperature, and greatly enhances the practicability of the sensor array.

Description

technical field [0001] The invention relates to the field of toxic gas detection, in particular to a method for identifiable detection of toxic atmospheres. The method improves its gas-sensing sensing characteristics by directly carbonizing polyaniline and realizes differential responses to various target gases. Background technique [0002] In recent years, my country's social economy has continued to develop, and the consumption of agricultural mineral resources has continued to increase. At the same time, a large amount of toxic and harmful gases has also been produced. However, my country's environmental protection started late, and the level of environmental protection awareness is not high. Therefore, people's daily life and production work The environment is getting worse and the air pollution is getting worse. A clean atmosphere is one of the most important conditions for people's survival and a necessary condition to ensure people's normal life and health. Toxic gas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127G01N27/126Y02A50/20
Inventor 吴钊峰张炜钰段海明
Owner XINJIANG UNIVERSITY