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NO2 gas sensor based on covalent triazinyl two-dimensional polymer as well as preparation method and application of NO2 gas sensor

A triazine-based two-dimensional gas sensor technology, applied in the field of nanomaterials, can solve the problems of high working temperature, high detection limit, and poor reproducibility, and achieve low cost, simple preparation process, good reproducibility and reversibility Effect

Inactive Publication Date: 2020-01-31
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently the main NO 2 Sensing materials include metal oxides, which have fast response speed and high sensitivity, but have disadvantages such as high working temperature, high power consumption, and high detection limit, as well as potential safety hazards.
The second type of sensing material is conductive polymers, which generally have low sensitivity and poor reproducibility
Previously, amorphous 3D COFs have been used for chemiresistive NH 3 sensor, but its sensitivity is very low (Gao, Q.; Li, X.; Ning, G.-H.; Leng, K.; Tian, ​​B.; Liu, C.; Tang, W.; Xu, H. -S.; Loh, K.P. Highly Photoluminescent Two-Dimensional Imine-Based Covalent Organic Frameworks for Chemical Sensing. Chem. Commun. 2018, 54, 2349-2352.)

Method used

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  • NO2 gas sensor based on covalent triazinyl two-dimensional polymer as well as preparation method and application of NO2 gas sensor
  • NO2 gas sensor based on covalent triazinyl two-dimensional polymer as well as preparation method and application of NO2 gas sensor
  • NO2 gas sensor based on covalent triazinyl two-dimensional polymer as well as preparation method and application of NO2 gas sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Preparation of layered covalent triazine skeleton crystals: 2 mg of terephthalonitrile was dissolved in 10 mL of CH 2 Cl 2middle. Then 10000r min -1 Centrifuge for 5 minutes to remove undissolved terephthalonitrile monomer to obtain a transparent monomer solution. Transfer it to the dropping funnel, then add 1mL of trifluoromethanesulfonic acid into a 250ml round bottom flask, and add the transparent terephthalonitrile monomer solution dropwise into the round bottom flask within 2h , the entire reaction system was stirred at 100° C., condensed and refluxed, and reacted overnight to convert terephthalonitrile monomers as much as possible to form covalent triazine skeleton crystals. After reacting for 4 hours, it can be found that yellow crystals are gradually attached to the round bottom flask. After the reaction is complete (12 hours), the reaction is quenched with 20 mL of ethanol. The filter cake was collected by filtration to obtain a reaction product, and th...

Embodiment 2

[0042] (1) Preparation of layered covalent triazine skeleton crystals: 40 mg of terephthalonitrile was dissolved in 20 mL of CH 2 Cl 2 middle. Then 10000r min -1 Centrifuge for 5 minutes to remove undissolved terephthalonitrile monomer to obtain a transparent monomer solution. Transfer it to the dropping funnel, then add 1mL of trifluoromethanesulfonic acid into a 250mL round bottom flask, and add the transparent terephthalonitrile monomer solution dropwise into the round bottom flask within 2h , the entire reaction system was stirred at 100° C., condensed and refluxed, and reacted overnight to convert terephthalonitrile monomers as much as possible to form covalent triazine skeleton crystals. After reacting for 4 hours, it can be found that yellow crystals are gradually attached to the round bottom flask. After the reaction is complete (12 hours), the reaction is quenched with 40 mL of ethanol. The filter cake is collected by filtration to obtain a reaction product, and t...

Embodiment 3

[0046] (1) Preparation of layered covalent triazine skeleton crystals: 200 mg of terephthalonitrile was dissolved in 20 mL of CH 2 Cl 2 middle. Then 10000r min -1 Centrifuge for 5 minutes to remove undissolved terephthalonitrile monomer to obtain a transparent monomer solution. Transfer it to the dropping funnel, then add 1ml of trifluoromethanesulfonic acid into a 250mL round bottom flask, and add the transparent terephthalonitrile monomer solution dropwise into the round bottom flask within 2h , the entire reaction system was stirred at 100° C., condensed and refluxed, and reacted overnight to convert terephthalonitrile monomers as much as possible to form covalent triazine skeleton crystals. After reacting for 4 hours, it can be found that yellow crystals are gradually attached to the round bottom flask. After the reaction is complete (12 hours), the reaction is quenched with 60 mL of ethanol. The filter cake was collected by filtration to obtain a reaction product, and...

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Abstract

The invention discloses an NO2 gas sensor based on a covalent triazinyl two-dimensional polymer as well as a preparation method and application of the NO2 gas sensor. The sensor comprises a gas sensitive material and a ceramic interdigital electrode, the gas sensitive material is coated on the surface of the ceramic interdigital electrode to form a sensing film, and the thickness of the sensing film is 6-10nm; the gas sensitive material includes a single layer of or 2 to 4 layers of triazinyl two-dimensional polymer nanosheets, and the thickness of the single layer is 1-2.5 nm. The sensor prepared by the invention has the advantages of high NO2 gas response value, stability and restorability, and can work at room temperature.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a preparation method of a triazine-based two-dimensional polymer and its gas sensing, preparation process and application. Background technique [0002] Nitrogen dioxide (NO 2 ) is a common harmful gas, reddish brown with pungent smell, mainly derived from the combustion of automobile exhaust and industrial fuel. An increase in the concentration of nitrogen dioxide in the air will cause acid rain and photochemical smog, and nitrogen dioxide is also one of the precursors of the most serious air pollutant PM2.5. In recent years, the content of nitrogen oxides (including nitric oxide and nitrogen dioxide) in the air has generally attracted people's attention. Currently the main NO 2 Sensing materials include metal oxides, which have fast response speed and high sensitivity, but have disadvantages such as high operating temperature, high power consumption, and hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/126G01N27/127
Inventor 苑文静杨凯唐艳婷杨进争
Owner HEBEI UNIV OF TECH
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