Boron and nitrogen co-doped graphene wave-absorbing material and preparation method and application thereof

A wave-absorbing material and graphene technology, applied in the field of wave-absorbing materials, can solve problems such as low attenuation factor, limited attenuation ability, and poor impedance matching characteristics, and achieve improved wave-absorbing performance, improved electromagnetic attenuation ability, and optimized impedance matching characteristics Effect

Active Publication Date: 2020-02-14
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is attributed to the poor impedance matching characteristics of single nitrogen-doped graphene, the low attenuation factor, and the limited attenuation ability

Method used

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  • Boron and nitrogen co-doped graphene wave-absorbing material and preparation method and application thereof
  • Boron and nitrogen co-doped graphene wave-absorbing material and preparation method and application thereof
  • Boron and nitrogen co-doped graphene wave-absorbing material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Prepare a 3 mg / mL GO solution using the Hummer method (reference: Preparation of Graphitic Oxide; J.Am.Chem.Soc.1958,80,6,1339); prepare 20 mL of 5 mol / L hydrochloric acid solution, and 2 g of cyanamide was added thereto, and then acidified and stirred for 1 h to obtain a 2 g / mL acid-treated cyanamide solution. Finally, 8ml of 3mg / mL GO solution and 32ml of 2g / mL acid-treated cyanamide were fully stirred for 2h, then transferred to a hydrothermal inner liner (50mL size) and sealed, and hydrothermally reacted at 200°C for 20h. After the reaction, it was centrifuged, washed and freeze-dried for 20 hours (-20°C), named N-G wave absorbing material.

[0045] (2) Take 20mg of N-G wave absorbing material and mix well with 2mol / L spectral grade boric acid solution (40mL), transfer it to a hydrothermal lining (specification: 50mL) and seal it, and react hydrothermally at 140°C for 6h. After the reaction, centrifuge, wash and freeze-dry for 20 hours (-20°C) to obtain nitroge...

Embodiment 2

[0049] The preparation steps are basically the same as in Example 1, except that the cyandiamide described in step (1) is replaced by dicyandiamide to obtain a wave-absorbing material named N / B-G-2.

Embodiment 3

[0051] The preparation steps are basically the same as in Example 1, except that the cyanamide described in step (1) is replaced with melamine to obtain a microwave-absorbing material named N / B-G-3.

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Abstract

The invention discloses a boron and nitrogen co-doped graphene wave-absorbing material and a preparation method thereof; the attenuation factor of the wave-absorbing material is well matched with impedance characteristic parameters in a frequency band of 2-18 GHz, so that the material is guaranteed to have excellent electromagnetic attenuation capability. The invention also discloses an application of the wave-absorbing material in the fields of military and civil high-frequency electromagnetic compatibility and protection. The density of the wave-absorbing material is 0.3 kg / cm<3>, the maximum reflectivity and the effective coverage bandwidth of the material can be effectively improved within the frequency range of 2-18 GHz, and the wave-absorbing material is an electromagnetic compatibility and protection material capable of meeting the requirements of civil high-frequency electronic devices and military airships, cannonballs and other weaponry.

Description

technical field [0001] The invention relates to the field of wave-absorbing materials, in particular to a boron and nitrogen co-doped graphene wave-absorbing material and its preparation method and application. Background technique [0002] As a new type of two-dimensional (2D) nanomaterial, graphene is composed of carbon atoms with SP 2 It consists of hybrid-connected monoatomic layers with a theoretical thickness of only 0.35 nm. In recent years, due to its unique 2D physical and chemical properties, special boundary effects, good chemical stability, and mechanical properties, graphene has shown good application prospects in the field of electromagnetic wave absorption. [0003] However, the impedance mismatch and single loss mechanism caused by the high conductivity of graphene itself hinder its further application in the field of microwave absorbing materials. At present, there are three coping strategies widely used by researchers: (1) Graphene bulk structure design: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194
CPCC01B2204/20C01B32/194
Inventor 宁明强满其奎谭果果李润伟
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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