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Preparation method and application of a gas-sensitive material for detecting ammonia gas

A gas-sensitive material and ammonia gas technology, which is applied in material resistance, material analysis, material analysis by electromagnetic means, etc., can solve problems such as damage, and achieve the effects of low cost, simple preparation process and environmental friendliness.

Active Publication Date: 2021-10-12
BENGBU COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Long-term exposure to ammonia will cause great harm to the human body. Therefore, it is urgently needed to prepare a fast, reliable, highly sensitive and selective ammonia gas sensor.

Method used

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  • Preparation method and application of a gas-sensitive material for detecting ammonia gas
  • Preparation method and application of a gas-sensitive material for detecting ammonia gas
  • Preparation method and application of a gas-sensitive material for detecting ammonia gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Take 1.30g of ammonium molybdate and 2.30g of thiourea and add 35mL of deionized water, and stir on a magnetic stirrer for 30min to form a uniform solution;

[0034] (2) Transfer the solution in step (1) to a 50mL reaction kettle, keep it in a constant temperature drying oven at 180°C for 24h, and then let the reaction system cool down to room temperature naturally;

[0035] (3) The product in step (2) is collected by centrifugation, and washed repeatedly with water and absolute ethanol until neutral;

[0036] (4) Put the product in step (3) into a crucible, place it in a drying oven and dry it at 60° C. for 24 hours to obtain a black powder material, which is stored for future use;

[0037] (5) Take 5g of melamine and place it in a covered crucible, and after calcining at 500°C for 2h at a heating rate of 2°C / min in a muffle furnace, continue to heat up to 520°C for 2h, and cool naturally to room temperature. 3 N 4 Grind into powder;

[0038] (6) Take 1g C3 N 4...

Embodiment 2

[0042] Preparation method is basically the same as embodiment 1, and the difference with embodiment 1 is:

[0043] Take 1mL of g-C in step (8) 3 N 4 Sonicate the solution dropwise into 10 mL of MoS 2 solution, prepared as g-C 3 N 4 with MoS 2 0.92% g-C by mass 3 N 4 / MoS 2 Material.

Embodiment 3

[0045] Preparation method is basically the same as embodiment 1, and the difference with embodiment 1 is:

[0046] Take 3mL of g-C in step (8) 3 N 4 Sonicate the solution dropwise into 10 mL of MoS 2 solution, prepared as g-C 3 N 4 with MoS 2 2.76% g-C by mass 3 N 4 / MoS 2 Material.

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Abstract

The invention relates to a preparation method and application of a gas-sensitive material for detecting ammonia, and belongs to the technical fields of functional materials, sensing technology and environmental monitoring. The present invention prepares MoS respectively 2 and g‑C 3 N 4 Materials, g‑C prepared by the sol method 3 N 4 / MoS 2 Nanocomposite as gas-sensing material to detect ammonia; will be coated with g‑C 3 N 4 / MoS 2 After the gas sensor of the nanocomposite material is aged, pass the resistance wire through it, and then use tin to weld the 6 filaments on the ceramic tube to the 6 pillars of the gas sensor base to obtain the required sensor gas for ammonia detection. Sensitive components. The prepared gas sensor has the advantages of high sensitivity, high selectivity and the like for detecting ammonia, and can be used for detecting ammonia in industrial environments.

Description

technical field [0001] The invention relates to a gas-sensitive material for detecting ammonia gas, a preparation method and an application thereof, and belongs to the technical fields of functional nanometer material preparation technology and gas sensing detection technology. Background technique [0002] In the 1930s, foreign countries began to study and develop gas sensors. By the middle of the last century, the sensing field had developed rapidly. Among them, semiconductor sensors, solid electrolyte sensors and humidity sensors had been commercialized in some countries. Nowadays, hundreds of gas sensors have been developed successively. In recent years, the gas-sensing performance of gas-sensing materials has been improved by making them into thin films or nanostructures, because the adsorption capacity, specific surface area and active sites of gas-sensing materials are the main reasons affecting their selectivity and sensitivity. Therefore, how to improve the respons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 张现峰芦静波王旭艳
Owner BENGBU COLLEGE