Preparation method of nitrogen-doped carbon nanotube wave-absorbing agent

A nanotube and azacarbon technology, applied in the directions of carbon nanotubes, nanocarbons, electrical components, etc., can solve the problems of tube wall distortion and low doping amount, and achieve simple process, easy large-scale production, and efficient electromagnetic wave absorption. performance effect

Pending Publication Date: 2022-04-12
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The former can obtain carbon nanotubes with a higher amount of nitrogen doping. However, when the simultaneous in-situ doping method is used, the inner and outer tubes are doped at the same time, which leads to serious distortion of the tube wall. At the same time, it is very easy to encapsulate the gas nitrogen source in the carbon nanotubes. In the tube cavity
The post-treatment nitrogen doping method is mainly based on surface doping, and the structure of carbon nanotubes is well maintained, but the doping amount is relatively low.

Method used

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  • Preparation method of nitrogen-doped carbon nanotube wave-absorbing agent
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  • Preparation method of nitrogen-doped carbon nanotube wave-absorbing agent

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Effect test

Embodiment 1

[0028] The preparation method of azacarbon nanotube sample 1 comprises the following steps:

[0029] Step 1: Weigh 20 mg of pyrrole and dissolve it in 15 mL of methanol, add 192.8 mg of induction reagent polyethylene glycol octylphenyl ether (the molar ratio of induction reagent to pyrrole monomer is 1:1), stir well to dissolve, add 15 mL The 1M ferric chloride solution of the oxidizing agent was stirred rapidly for 4 hours, followed by filtering, washing with ethanol, washing with water, and vacuum drying to obtain polypyrrole nanotubes.

[0030] Step 2: Place the polypyrrole nanotubes in a tube furnace, protect them with argon, raise the temperature from room temperature to 500°C at 10°C / min and keep it warm for 3 hours to obtain azacarbon nanotubes, which are designated as sample 1.

Embodiment 2

[0032] The preparation method of azacarbon nanotube sample 2 comprises the following steps:

[0033] Step 1: Weigh 20 mg of pyrrole and dissolve it in 15 mL of methanol, add 85.9 mg of induction reagent sodium dodecyl sulfate (the molar ratio of induction reagent to pyrrole monomer is 1:1), stir well to dissolve, add 15 mL of oxidant 1M chlorine The ferric chloride solution was stirred rapidly for 4 hours, followed by steps of filtration, ethanol washing, water washing, and vacuum drying to obtain polypyrrole nanotubes.

[0034] Step 2: Place the polypyrrole nanotubes in a tube furnace, protect them with argon, and raise them from room temperature to 500°C at 10°C / min and keep them warm for 3 hours to obtain azacarbon nanotubes, which are designated as sample 2.

Embodiment 3

[0036] The preparation method of azacarbon nanotube sample 3 comprises the following steps:

[0037] Step 1: Weigh 100 mg of pyrrole and dissolve it in 30 mL of methanol, add 96.4 mg of induction reagent polyethylene glycol octylphenyl ether (the molar ratio of induction reagent to pyrrole monomer is 1:10), stir well to dissolve, add 15 mL The 1M ferric chloride solution of the oxidizing agent was stirred rapidly for 4 hours, followed by filtering, washing with ethanol, washing with water, and vacuum drying to obtain polypyrrole nanotubes.

[0038] Step 2: Place the polypyrrole nanotubes obtained in step 1 in a tube furnace, protect them with argon, raise them from room temperature to 500°C at 10°C / min and keep them warm for 3 hours to obtain azacarbon nanotubes, denoted as Sample 3.

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Abstract

The invention discloses a preparation method of an aza carbon nanotube wave-absorbing agent. The method comprises the following steps: dissolving pyrrole in methanol, adding an induction reagent and an oxidant ferric chloride solution, rapidly stirring and reacting to obtain a polypyrrole nanotube, and carbonizing the polypyrrole nanotube at 500-700 DEG C to obtain the nitrogen-doped carbon nanotube. And the material has efficient electromagnetic wave absorption performance. The invention further discloses a preparation method of the nitrogen-doped carbon nanotube wave-absorbing agent, the method is simple in process, complex synthesis equipment is not needed, large-scale production is easy, the prepared nitrogen-doped carbon nanotube wave-absorbing agent has efficient electromagnetic wave absorbing performance, the conductivity is 10 <-2 >-10 < 2 > S / cm, and the electromagnetic wave absorbing frequency is 2-18 GHz.

Description

technical field [0001] The invention relates to a preparation method of an azacarbon nanotube wave absorbing agent, belonging to the technical field of wave absorbing material preparation. Background technique [0002] With the acceleration of the modern informationization process, the problems of self-disturbance, mutual disturbance, enemy disturbance and radiation leakage in the electromagnetic environment have become serious problems faced by current national defense projects and environmental security. The development of high-performance absorbing materials is an important way to solve the problem of electromagnetic interference in the current complex electromagnetic environment. Among many new materials, carbon nanomaterials, especially carbon nanotubes, have received extensive attention because of their excellent electrical conductivity and stability. Because the electrons in carbon nanotubes can only move axially along the graphitized tube wall, they exhibit unique e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/16H05K9/00
Inventor 方晨晨陈艳霞谢阿明吴利鹏吴凡董伟
Owner NANJING UNIV OF SCI & TECH
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