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Cobalt-nickel-graphene composite wave-absorbing material and preparation method thereof

A graphene composite and wave-absorbing material technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of high density, narrow effective absorption bandwidth, complex preparation methods, etc., and achieve low density and good application prospects. Effect

Pending Publication Date: 2020-09-01
福建美庆热传科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different from traditional electromagnetic shielding materials, wave-absorbing materials can effectively absorb electromagnetic waves without causing secondary radiation, but current wave-absorbing materials have the disadvantages of low absorption strength and narrow effective absorption bandwidth.
The saturation magnetization and permeability of magnetic metals are large, and the ability to attenuate electromagnetic waves is strong, but their chemical stability and corrosion resistance are poor, their density is high, their preparation methods are complicated, and their yields are low.

Method used

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  • Cobalt-nickel-graphene composite wave-absorbing material and preparation method thereof
  • Cobalt-nickel-graphene composite wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of a cobalt-nickel-graphene composite wave-absorbing material, the specific steps comprising:

[0020] S1. Preparation of Co / Ni precursor: Co(NO 3 ) 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O and Na 4 EDTA is used as raw material, and Co / Ni precursor is prepared by hydrothermal method;

[0021] Specifically: Co(NO 3 ) 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O and 0.012mol were dissolved in 20mL of deionized water, added 10mL of methanol, dispersed evenly by ultrasonication for 30min, transferred to a reaction kettle, placed in a vacuum drying oven, heated to 200°C, kept for 24h, cooled to room temperature, and deionized water and Washed repeatedly with ethanol until neutral, and dried at 60°C to obtain a Co / Ni precursor.

[0022] Among them, the Co(NO 3 ) 2 ·6H 2 O and the Ni(NO 3 ) 2 ·6H 2 The molar ratio of O is 1:0.8.

[0023] S2. Dissolve the graphene and the Co / Ni precursor prepared in step S1 in ultrapure water, ultrasonically disperse for 2 hour...

Embodiment 2

[0029] A preparation method of a cobalt-nickel-graphene composite wave-absorbing material, the specific steps comprising:

[0030] S1. Preparation of Co / Ni precursor: Co(NO 3 ) 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O and Na 4 EDTA is used as raw material, and Co / Ni precursor is prepared by hydrothermal method;

[0031] Specifically: Co(NO 3 ) 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O and 0.012mol were dissolved in 20mL of deionized water, added 10mL of methanol, dispersed evenly by ultrasonication for 30min, transferred to a reaction kettle, placed in a vacuum drying oven, heated to 200°C, kept for 24h, cooled to room temperature, and deionized water and Washed repeatedly with ethanol until neutral, and dried at 60°C to obtain a Co / Ni precursor.

[0032] Among them, the Co(NO 3 ) 2 ·6H 2 O and the Ni(NO 3 ) 2 ·6H 2 The molar ratio of O is 1:0.6.

[0033] S2. Dissolve the graphene and the Co / Ni precursor prepared in step S1 in ultrapure water, ultrasonically disperse for 2 hour...

Embodiment 3

[0039] A preparation method of a cobalt-nickel-graphene composite wave-absorbing material, the specific steps comprising:

[0040] S1. Preparation of Co / Ni precursor: Co(NO 3 ) 2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O and Na 4 EDTA is used as raw material, and Co / Ni precursor is prepared by hydrothermal method;

[0041] Specifically: Co(NO 3 )2 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O and 0.012mol were dissolved in 20mL of deionized water, added 10mL of methanol, dispersed evenly by ultrasonication for 30min, transferred to a reaction kettle, placed in a vacuum drying oven, heated to 200°C, kept for 24h, cooled to room temperature, and deionized water and Washed repeatedly with ethanol until neutral, and dried at 60°C to obtain a Co / Ni precursor.

[0042] Among them, Co(NO 3 ) 2 ·6H 2 O and Ni(NO 3 ) 2 ·6H 2 The molar ratio of O is 1:1.

[0043] S2. Dissolve the graphene and the Co / Ni precursor prepared in step S1 in ultrapure water, ultrasonically disperse for 2 hours to obtain ...

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Abstract

The invention provides a cobalt-nickel-graphene composite wave-absorbing material and a preparation method thereof, and belongs to the field of wave-absorbing material preparation. The method providedby the invention comprises the following specific steps: S1, preparing a Co / Ni precursor: preparing the Co / Ni precursor by taking Co(NO3)2.6H2O, Ni(NO3) 2.6H2O and Na4EDTA as raw materials and adopting a hydrothermal method; S2, dissolving graphene and the Co / Ni precursor prepared in the step S2 into ultrapure water, performing ultrasonically dispersing for 2 hours to obtain turbid liquid, addinghydrazine hydrate, transferring the mixture into a high-pressure reaction kettle, putting the reaction kettle into a vacuum drying oven, performing heating to 200 DEG C, keeping the temperature for 24 hours, performing cooling to room temperature, repeatedly washing with deionized water and ethanol to be neutral, and performing drying at 60 DEG C to obtain a Co / Ni-GO composite material; and S3, putting the Co / Ni-coated GO composite material prepared in the step S2 into a tubular furnace, performing heating to 700 DEG C in an N2 atmosphere, and carrying out heat preservation for 5-6 hours to obtain the Co / Ni-coated rGO composite wave-absorbing material. The effective frequency band width of the Co / Ni@rGO composite wave-absorbing material provided by the invention is 12.2 GHz, the maximum reflection loss can reach -46.3 dB (13.8 GHz), the density is low, and the Co / Ni@rGO composite wave-absorbing material has a good application prospect.

Description

technical field [0001] The invention relates to the field of preparation of wave-absorbing materials, in particular to a cobalt-nickel-graphene composite wave-absorbing material and a preparation method thereof. Background technique [0002] With the development and application of radio network technology, a large number of electromagnetic waves have entered the living space of human beings, causing serious negative problems such as electromagnetic interference and electromagnetic radiation pollution. Different from traditional electromagnetic shielding materials, wave-absorbing materials can effectively absorb electromagnetic waves without causing secondary radiation, but current wave-absorbing materials have the disadvantages of low absorption strength and narrow effective absorption bandwidth. Magnetic metals have high saturation magnetization and permeability, and strong ability to attenuate electromagnetic waves. However, their chemical stability and corrosion resistanc...

Claims

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Application Information

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IPC IPC(8): H05K9/00H01Q17/00C01B32/194
CPCH05K9/0081H01Q17/00C01B32/194
Inventor 林永胜
Owner 福建美庆热传科技有限公司