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Hierarchical structure hollow CNTs/Co/C fiber wave-absorbing material and preparation method thereof

A hierarchical structure and wave-absorbing material technology, applied in chemical instruments and methods, other chemical processes, inorganic chemistry, etc., can solve problems such as poor electromagnetic wave absorption intensity, impedance mismatch, etc., achieve difficulty, solve agglomeration, and simplify growth steps Effect

Active Publication Date: 2020-03-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem of poor electromagnetic wave absorption intensity caused by the impedance mismatch caused by the high dielectric constant of pure carbon-based wave-absorbing materials and the single electromagnetic wave loss mechanism , providing a hierarchical structure hollow CNTs / Co / C fiber absorbing material and its preparation method

Method used

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  • Hierarchical structure hollow CNTs/Co/C fiber wave-absorbing material and preparation method thereof
  • Hierarchical structure hollow CNTs/Co/C fiber wave-absorbing material and preparation method thereof
  • Hierarchical structure hollow CNTs/Co/C fiber wave-absorbing material and preparation method thereof

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specific Embodiment approach 1

[0027] Embodiment 1: This embodiment describes a hollow CNTs / Co / C fiber absorbing material with a hierarchical structure. The fiber absorbing material is sequentially composed of hollow cotton fibers, Co / C nanoparticles and carbon The hollow cotton fiber is composed of nanotubes, and the surface of the hollow cotton fiber is evenly covered by Co / C nanoparticles, and carbon nanotubes are uniformly distributed on the surface of the Co / C nanoparticles.

specific Embodiment approach 2

[0028] Embodiment 2: A method for preparing the hollow CNTs / Co / C fiber wave-absorbing material with hierarchical structure described in Embodiment 1, the steps of the method are:

[0029] Step 1: drying the cotton fiber to remove the adsorbed moisture;

[0030]Step 2: Prepare 2-methylimidazole methanol solution, soak the dried cotton fiber in step 1 into the above solution, and place it in a 100Pa vacuum drying oven for vacuum holding. Soaked cotton fiber shall prevail;

[0031] Step 3: Take out the 2-methylimidazole methanol solution soaked with cotton fibers from the vacuum drying oven, prepare cobalt nitrate methanol solution, then pour the cobalt nitrate methanol solution into the 2-methylimidazole methanol solution soaked with cotton fibers, Stir and oscillate to mix the solution evenly, take out the cotton fiber after standing for 24-48h, at this time, there are ZIF-67 metal-organic framework nanoparticles on the surface of the cotton fiber, wash with methanol, and dry ...

specific Embodiment approach 3

[0033] Embodiment 3: In the preparation method of a hollow CNTs / Co / C fiber wave-absorbing material with a hierarchical structure described in Embodiment 2, in step 1, the cotton is medical absorbent cotton or natural cotton fiber.

[0034] Embodiment 4: In the preparation method of a hollow CNTs / Co / C fiber wave-absorbing material with a hierarchical structure described in Embodiment 2, in step 1, the drying temperature is 60-80°C, and the drying time is 8-80°C. 12h.

[0035] Specific embodiment five: the preparation method of a hierarchical structure hollow CNTs / Co / C fiber absorbing material described in specific embodiment two, in step two, the concentration of the 2-methylimidazole methanol solution is 0.4-0.8mol / L, the mass of soaked cotton and the volume ratio of 2-methylimidazole methanol solution is about 2g cotton immersed in 40-80mL 2-methylimidazole methanol solution, and the vacuum holding time is 3-6h.

[0036] Specific embodiment six: the preparation method of a ...

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Abstract

The invention discloses a hierarchical structure hollow CNTs / Co / C fiber wave-absorbing material and a preparation method thereof, and belongs to the technical field of radar wave-absorbing materials.The method takes cotton fibers and Co-containing zeolite imidazole structure metal organic framework ZIF-67 nanoparticles as raw materials. ZIF-67 nanoparticles with a regular dodecahedron microstructure grow and coat the surfaces of the cotton fibers in situ, cotton fibers are carbonized into hollow carbon fibers through a high-temperature carbonization process in a reductive H2 / Ar mixed atmosphere, the pyrolysis of the ZIF-67 metal organic framework nanoparticles and the catalytic growth of the carbon nanotubes are realized so that the hollow CNTs / Co / C fiber wave-absorbing material with themicron carbon fiber-nanotube hierarchical structure is obtained, and under the conditions that the density is 0.02 g / cm<3> and the thickness is 2 mm, the maximum absorption intensity of electromagnetic waves at 14 GHz reaches -59.5 dB, and the effective absorption frequency band width reaches 6.2 GHz (11.8-18 GHz). The technical problems that a traditional wave-absorbing material is high in density, low in absorption strength and narrow in frequency band are solved.

Description

technical field [0001] The invention belongs to the technical field of radar absorbing materials, and in particular relates to a hollow CNTs / Co / C fiber absorbing material with hierarchical structure and a preparation method thereof. Background technique [0002] Microwave and radio communication technologies are more and more widely used in people's daily life, bringing great convenience to life, but also causing serious electromagnetic wave radiation pollution. At present, electromagnetic pollution has become another serious environmental pollution after chemical pollution and acoustic pollution. On the other hand, modern warfare has put forward higher electromagnetic stealth performance requirements for military aircraft such as fighter jets and drones. Therefore, the development of lightweight and high-performance electromagnetic wave absorbing materials is imminent. The ideal electromagnetic wave absorbing material has the performance characteristics of light material d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00C01B32/158C01B32/168
CPCC09K3/00C01B32/158C01B32/168
Inventor 李宜彬杨明龙尹维龙
Owner HARBIN INST OF TECH
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