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Cobalt-carbon composite wave-absorbing material derived from nickel-doped metal organic framework and preparation method thereof

A metal-organic framework and wave-absorbing material technology, which is applied in the direction of carbon compounds, non-metallic elements, chemical instruments and methods, etc., can solve the problems of high filling degree and narrow effective absorption frequency band, and achieve enhanced conductivity and improved impedance matching characteristics , The effect of promoting polarization loss

Active Publication Date: 2021-08-24
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems of high filling degree and narrow effective absorption frequency band of MOFs-derived absorbing materials, the present invention provides a cobalt-carbon composite absorbing material derived from a nickel-doped metal-organic framework, and provides a nickel-doped Preparation method of cobalt carbon composite absorbing material derived from metal organic framework

Method used

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  • Cobalt-carbon composite wave-absorbing material derived from nickel-doped metal organic framework and preparation method thereof
  • Cobalt-carbon composite wave-absorbing material derived from nickel-doped metal organic framework and preparation method thereof
  • Cobalt-carbon composite wave-absorbing material derived from nickel-doped metal organic framework and preparation method thereof

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Embodiment 1

[0025] The specific preparation steps of a nickel-doped metal-organic framework-derived cobalt-carbon composite absorbing material are as follows:

[0026] (1) Dissolve 0.225 g cobalt nitrate hexahydrate in 3 mL deionized water, dissolve 2.75 g 2-methylimidazole in 20 mL deionized water, and stir for 20 min respectively to obtain cobalt nitrate hexahydrate solution and 2-methylimidazole imidazole solution. Pour the 2-methylimidazole solution into the cobalt nitrate hexahydrate solution and keep stirring for 24 h. At the end of the reaction, the product was centrifuged and separated, and the separated product was washed twice with deionized water and methanol, dried under vacuum at 40°C, and ground to obtain a purple metal-organic framework powder; the metal-organic framework powder was 2-methyl Cobalt imidazole (ZIF-67) powder, with cobalt as the central metal element and 2-methylimidazole as the organic ligand, has a particle size of 500-1500 nm.

[0027] (2) Mix and grind ...

Embodiment 2

[0036] The specific preparation steps of a nickel-doped metal-organic framework-derived cobalt-carbon composite absorbing material are as follows:

[0037] (1) Dissolve 0.225 g cobalt nitrate hexahydrate in 3 mL deionized water, 2.75 g 2-methylimidazole in 20 mL deionized water, and stir for 20 min respectively to obtain cobalt nitrate hexahydrate solution and 2-methylimidazole solution. Pour the 2-methylimidazole solution into the cobalt nitrate hexahydrate solution and keep stirring for 24 h. At the end of the reaction, the product was centrifuged and separated, and the separated product was washed twice with deionized water and methanol, dried under vacuum at 40°C, and ground to obtain a purple metal-organic framework powder; the metal-organic framework powder was 2-methyl Cobalt imidazole (ZIF-67) powder, with cobalt as the central metal element and 2-methylimidazole as the organic ligand, has a particle size of 500-1500 nm.

[0038] (2) Mix and grind 1 g of ZIF-67 powde...

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Abstract

The invention discloses a cobalt-carbon composite wave-absorbing material derived from a nickel-doped metal organic framework and a preparation method thereof, which belong to the technical field of microwave absorbing materials. By adjusting the adding amount of nickel salt in the 2-methylimidazole cobalt and melamine compound, the magnetic metal components and content in the derived cobalt-nickel-carbon material, the graphitization degree and structural form of the carbon material and the like are effectively adjusted, optimization of electromagnetic loss is achieved, and then effective absorption frequency band broadening is achieved under the low filling degree. The introduction of the nickel nanoparticles promotes the appearance of the sheet-shaped carbon material, and the cobalt and nickel nanoparticles catalyze the growth of the short carbon nanotubes, so that both the cobalt and nickel nanoparticles are helpful for enhancing the conductivity under a low filling degree; and more surface defects and abundant interface structures also promote the enhancement of polarization loss. The effective absorption frequency band of the derived cobalt-nickel-carbon composite wave-absorbing material can reach 5.6 GHz under the conditions that the filling degree is 20 wt% and the thickness is 1.7 mm, and excellent light broadband wave-absorbing characteristics are shown. The manufacturing cost is low, and the manufacturability is good.

Description

technical field [0001] The invention belongs to the technical field of microwave absorbing materials, in particular to a cobalt-carbon composite wave-absorbing material derived from a nickel-doped metal-organic framework, and also relates to a preparation method for the above-mentioned cobalt-carbon composite wave-absorbing material derived from a nickel-doped metal-organic framework . Background technique [0002] In recent years, the rapid development of electronic information technology has not only brought great convenience to human life, but also brought serious problems such as electromagnetic interference and electromagnetic radiation pollution, which may cause economic losses and personal injuries. How to weaken the adverse effects of electromagnetic radiation and interference has become an urgent problem for related industries. Absorbing materials can convert the energy of incident electromagnetic waves into heat and other forms through electromagnetic attenuation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205C01B32/16C01B32/15H05K9/00B82Y40/00B82Y30/00B22F9/20
CPCC01B32/205C01B32/16C01B32/15H05K9/0081B82Y40/00B82Y30/00B22F9/20
Inventor 刘伟段鹏韬张学斌苏海林
Owner HEFEI UNIV OF TECH
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