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A kind of flexible ammonia sensing material and preparation method based on cnts/polyaniline

A sensing material, polyaniline technology, applied in the direction of analysis of materials, material resistance, material analysis by electromagnetic means, etc., can solve the problems of poor gas selectivity and low gas response, achieve good ammonia gas selectivity, improve gas Sensitivity, good gas response effect

Active Publication Date: 2022-03-15
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the above sensing materials, carbon nanotubes (CNTs) are widely used because of their large specific surface area, more active sites, and good electrical conductivity, but their response to gases is still low and their gas selectivity is low. poor

Method used

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  • A kind of flexible ammonia sensing material and preparation method based on cnts/polyaniline
  • A kind of flexible ammonia sensing material and preparation method based on cnts/polyaniline
  • A kind of flexible ammonia sensing material and preparation method based on cnts/polyaniline

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preparation example Construction

[0022] The preparation method of the flexible ammonia sensing material based on CNTs / polyaniline is characterized in that the steps are as follows:

[0023] Step 1: Amino groups are modified on the surface of PET by immersing PET fibers in ethylenediamine solution.

[0024] Step 2: Adsorb the CNTs layer on the surface of the PET fiber by using an ultrasonic vibration adsorption process.

[0025] Step 3: Prepare polyaniline on the CNTs layer by in-situ polymerization.

[0026] Wherein, the process of modifying amino groups on the surface of PET fibers described in step 1, the experimental raw materials and parameters are: ethylenediamine solution for surface modification of amino groups, the concentration of ethylenediamine is 50-70wt%, and the dipping temperature is 40-70°C , The soaking time is 10-30min.

[0027] The specific preparation process of the amino group modified on the surface of the PET fiber is as follows: After the PET fiber is ultrasonicated in absolute ethan...

Embodiment

[0035] Such as figure 1 As shown, the PET fiber is used as the material substrate, the PET fiber is modified with amino functional groups, and the CNTs layer and polyaniline are adsorbed on the surface of the PET fiber.

[0036] The preparation method of the flexible ammonia sensing material based on CNTs / polyaniline has the following steps:

[0037] Step 1: Amino groups are modified on the surface of PET by immersing PET fibers in ethylenediamine solution.

[0038] Step 2: Adsorb the CNTs layer on the surface of the PET fiber by using an ultrasonic vibration adsorption process.

[0039] Step 3: Prepare polyaniline on the CNTs layer by in-situ polymerization.

[0040] Wherein, the technology of amino group modification on the surface of PET fiber described in step 1, its experimental raw materials and parameters are: carry out the ethylenediamine solution of surface modification amino group, its ethylenediamine concentration is 50wt%, immersion temperature is 50 ℃, and immer...

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Abstract

The invention relates to a flexible ammonia sensing material based on CNTs / polyaniline and a preparation method thereof. The flexible PET fiber is used as the sensing material base, and the flexible PET fiber base is modified with amino functional groups on the surface, and attached to the surface of the flexible PET fiber. There are layers of CNTs and polyaniline. Among them, the surface of the PET fiber was impregnated with ethylenediamine solution to modify the amino functional group, the CNTs were combined with the surface of the PET fiber through an ultrasonic vibration adsorption process, and polyaniline was combined with the surface of the CNTs through in-situ polymerization. The invention adopts flexible PET fiber as a base, and modifies amino groups on the surface of the PET fiber to increase the load capacity of CNTs on the PET surface, thereby improving the gas-sensitivity of the CNTs / polyaniline material to ammonia. The ammonia gas sensing material obtained by the invention has good gas response and good ammonia gas selectivity.

Description

technical field [0001] The invention belongs to the field of gas detection and gas-sensing materials, and relates to a CNTs / polyaniline-based flexible ammonia sensing material and a preparation method. Background technique [0002] Ammonia is a colorless gas with a pungent smell. As an important chemical reagent, ammonia is often used as the precursor of many nitrides. In the food field, ammonia is often used as a protein detection agent. However, ammonia gas is flammable and toxic. Studies have shown that when the concentration of ammonia gas is greater than 300ppm, it will cause serious damage to human organs. Therefore, in industrial production and domestic applications, the existence and concentration of ammonia gas Testing is very important. [0003] At present, common ammonia sensing materials are mainly divided into three categories: the first category is metal oxide ammonia sensing materials, which have better response and recovery speed, and better chemical stabili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/61D06M11/74D06M13/332G01N27/12C08G73/02D06M101/32
CPCD06M15/61D06M11/74D06M13/332G01N27/126C08G73/0266D06M2101/32
Inventor 樊慧庆李哲新马江微
Owner NORTHWESTERN POLYTECHNICAL UNIV
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