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FeNi/C nanofiber electromagnetic absorber and preparation method thereof

A nanofiber, electromagnetic wave absorbing technology, applied in the field of wave absorbing materials, can solve the problems of affecting the electromagnetic wave absorbing properties of composite materials, reducing the magnetic properties of metal materials, and being easily oxidized, etc. The effect of oxidation

Inactive Publication Date: 2018-09-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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Problems solved by technology

The combination of carbon nanofibers and metal materials can optimize the electromagnetic parameters of electromagnetic absorbers, but in the existing composite electromagnetic absorbers of carbon nanofibers and metal materials, the metal materials are loaded on the surface of carbon nanofibers and are easily oxidized. Thereby reducing the magnetism of the metal material, which in turn affects the electromagnetic absorption performance of the entire composite material

Method used

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  • FeNi/C nanofiber electromagnetic absorber and preparation method thereof
  • FeNi/C nanofiber electromagnetic absorber and preparation method thereof
  • FeNi/C nanofiber electromagnetic absorber and preparation method thereof

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Embodiment 1

[0026] The FeNi / C nanofiber electromagnetic wave absorbing agent of the present invention, the electromagnetic wave absorbing agent is formed by stacking each other of a plurality of FeNi / C nanofibers (that is, the electromagnetic wave absorbing agent is formed by stacking one-dimensional electrospinning nanofibers); FeNi / C nanofibers overlap each other to form a conductive network. The length of FeNi / C nanofibers is on the order of microns. The diameter of each FeNi / C nanofiber is 100-250nm, and the diameter of FeNi nanoparticles is about 11.8nm; each FeNi / C In nanofibers, FeNi nanoparticles are embedded in C nanofibers, that is, carbon nanofibers wrap FeNi nanoparticles in it.

[0027] The preparation method of the above-mentioned FeNi / C nanofiber electromagnetic wave absorbing agent specifically comprises the following steps:

[0028] Step 1, preparation of electrospinning solution: Add 0.025mmol iron acetylacetonate and 0.0125mmol nickel acetate into 5mL N,N-dimethylformam...

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Abstract

The invention discloses an FeNi / C nanofiber electromagnetic absorber, which is composed of a plurality of FeNi / C nanofibers that are stacked together. The multiple FeNi / C nanofibers overlap with eachother to form a conductive network, and in each FeNi / C nanofiber, FeNi nanoparticles are wrapped in a C nanofiber. The invention also discloses a preparation method of the FeNi / C nanofiber electromagnetic absorber. The FeNi / C nanofiber electromagnetic absorber prepared by the preparation method has a one-dimensional nanofiber structure, and a plurality of one-dimensional nanofibers are stacked together to form a conductive network structure. The FeNi / C nanofiber electromagnetic absorber has good conductivity and has high reflection loss and wide effective absorption band at small thickness. When the thickness is small (1.8mm), the effective absorbing frequency band can reach 4.4 GHz, and when the thickness is 2.7mm, the absorbing performance can reach -24.8dB.

Description

technical field [0001] The invention relates to a FeNi / C nanofiber electromagnetic wave absorbing agent, and also relates to a preparation method of the FeNi / C nanofiber electromagnetic wave absorbing agent, which belongs to the technical field of wave absorbing materials. Background technique [0002] One-dimensional materials such as nanowires, nanorods, and nanotubes are widely used in the field of electromagnetic wave absorption due to their anisotropy, large aspect ratio, good dispersion properties, and can provide direct electron transmission paths. . Among them, carbon nanofibers, as one of the one-dimensional materials, have received extensive attention. Many carbon nanofibers have been used to study its absorbing properties to meet the characteristics of strong absorption, wide frequency band, light weight and low density of ideal absorbing materials. For example, Fe obtained after calcination at 700°C for 5 h 3 o 4 The maximum reflectance of / C nanofiber can re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00D01F9/22D01F1/09
CPCH05K9/009D01F1/09D01F9/22
Inventor 姬广斌吕婧梁小会
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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