Carbon-coated cobalt composite nano wave-absorbing material and preparation method thereof

A composite nano-particle and nano-particle technology, applied in the field of carbon-coated cobalt composite nano-wave absorbing materials, can solve the problems of unsatisfactory electromagnetic wave absorption performance of composite materials, easy agglomeration of magnetic metal cobalt particles, poor impedance matching, etc., and achieve excellent electromagnetic waves. The effect of absorption performance, low cost, simple process

Active Publication Date: 2021-06-08
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor impedance matching between cobalt with high magnetic permeability and carbon materials with high dielectric constant, the electromagnetic wave absorption performance of composite materials is not ideal.
At the same time, magnetic metal cobalt particles are easy to agglomerate, and it is difficult to obtain uniform and stable carbon-coated cobalt particles

Method used

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  • Carbon-coated cobalt composite nano wave-absorbing material and preparation method thereof
  • Carbon-coated cobalt composite nano wave-absorbing material and preparation method thereof
  • Carbon-coated cobalt composite nano wave-absorbing material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] The method for preparing the carbon-coated cobalt composite nano wave-absorbing material of the present invention comprises the following steps:

[0060] Step 1, preparation of Co by nitrate pyrolysis 3 o 4 nanoparticles;

[0061] Step 11, 0.02mol of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) dissolved in 100 mL of deionized water; adding 40 mL of ammonia water (25-28%) to adjust the pH of the solution to 11-12, and stirring the solution for 120 min to obtain a mixed solution;

[0062] Ultrasonic conditions: ultrasonic frequency 40kHz, ultrasonic treatment time 30min;

[0063] Step 12, put the mixed solution in a drying oven at 180°C and keep the temperature constant for 8 hours to prepare Co 3 o 4 Powder;

[0064] Step 13, deionized water for Co 3 o 4 The powder was washed repeatedly to obtain pure Co 3 o 4 Powder;

[0065] Step 14, the pure Co 3 o 4 The powder was dried in a vacuum oven at 50°C to 80°C for 12 hours to obtain Co 3 o 4 nanoparticl...

Embodiment 2

[0080] The method for preparing the carbon-coated cobalt composite nano wave-absorbing material of the present invention comprises the following steps:

[0081] Step 1, preparation of Co by nitrate pyrolysis 3 o 4 nanoparticles;

[0082] Step 11, 0.01mol of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) dissolved in 50mL of deionized water; add 20mL of ammonia water (25-28%) to adjust the pH of the solution to 11-12, and stir the solution for 120min to prepare a mixed solution;

[0083] Ultrasonic conditions: ultrasonic frequency 40kHz, ultrasonic treatment time 30min;

[0084] Step 12, put the mixed solution in a drying oven at 180°C and keep the temperature constant for 8 hours to prepare Co 3 o 4 Powder;

[0085] Step 13, deionized water for Co 3 o 4 The powder was washed repeatedly to obtain pure Co 3 o 4 Powder;

[0086] Step 14, the pure Co 3 o 4 The powder was dried in a vacuum oven at 60°C for 12 hours to obtain Co 3 o 4 nanoparticles.

[0087] Step...

Embodiment 3

[0097] The method for preparing the carbon-coated cobalt composite nano wave-absorbing material of the present invention comprises the following steps:

[0098] Step 1, preparation of Co by nitrate pyrolysis 3 o 4 nanoparticles;

[0099] Step 11, 0.02mol of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) be dissolved in 100mL of deionized water; add 40mL of ammonia water (25-28%) to adjust the pH of the solution to 11-12, and stir the solution for 120min; prepare a mixed solution;

[0100] Ultrasonic conditions: ultrasonic frequency 40kHz, ultrasonic treatment time 30min;

[0101] Step 12, put the mixed solution in a drying oven at 180°C and keep the temperature constant for 8 hours to prepare Co 3 o 4 Powder;

[0102] Step 13, deionized water for Co 3 o 4 The powder was washed repeatedly to obtain pure Co 3 o 4 Powder;

[0103] Step 14, the pure Co 3 o 4 The powder was dried in a vacuum oven at 60°C for 12 hours to obtain Co 3 o 4 nanoparticles.

[0104] St...

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Abstract

The invention discloses a carbon-coated cobalt composite nano wave-absorbing material. The material comprises a magnetic metal Co nano particle (1) and an amorphous carbon layer (2), the Co nano particle is an internal core, and the surface of the Co nano particle is uniformly coated with a carbon shell layer. According to a method, a nitrate pyrolysis method and a liquid phase hydrolysis / polymerization-carbon reduction method are adopted to prepare Co@C composite nano particles, the synthesis process is simple, and the average diameter of the obtained Co@C composite nano particles is 5-100 nm. In the field of electromagnetic wave absorption, the Co@C composite nanoparticles are used as a wave absorbing agent, the thickness of a wave absorbing body is 1-4 mm, the effective wave absorbing bandwidth is 3.5-18 GHz, and the Co-C composite nanoparticles can completely cover the whole C, X and Ku wave bands.

Description

technical field [0001] The invention relates to a wave-absorbing material, more particularly to a carbon-coated cobalt composite nano wave-absorbing material, which can be applied to the technical field of electromagnetic wave absorption. Background technique [0002] With the rapid development of wireless electronic communication and the wide application of high-frequency electronic devices, electromagnetic pollution problems such as electromagnetic interference and electromagnetic radiation are becoming more and more serious. On the one hand, electromagnetic interference can affect the normal operation of precision electronic equipment and cause instrument malfunctions. In addition, electromagnetic radiation can cause disorders of the body's biological clock, decreased immunity, and cell lesions, which can seriously harm human health. Electromagnetic pollution has become the fourth largest pollution in today's life after water pollution, air pollution and noise pollution....

Claims

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Application Information

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IPC IPC(8): H05K9/00H01Q17/00B22F1/00B22F1/02B22F9/20B82Y25/00B82Y30/00B82Y40/00
CPCH05K9/0081H01Q17/00B22F9/20B82Y30/00B82Y25/00B82Y40/00B22F1/07B22F1/16B22F1/054
Inventor 刘彤王宝磊付永港
Owner BEIHANG UNIV
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