Preparation method of wave absorbing material with nickel nanoparticles wrapped with porous carbon-loaded graphene

Abstract

The invention provides a preparation method of a wave absorbing material with nickel nanoparticles wrapped with porous carbon-loaded graphene. The preparation method of the wave absorbing material with the nickel nanoparticles wrapped with the porous carbon-loaded graphene comprises the steps that alga are used as a carbon source and soaked in a nickel saline solution, and nickel ions are made to enter algal cells; low-temperature heat treatment is conducted on the alga after the alga are frozen and dried, so that the alga are converted into carbon, and metallic nickel slat is oxidized into nickel oxide; and then the temperature is increased to continue to conduct high-temperature heat treatment, so that the nickel oxide is reduced into nickel, the amorphous carbon wrapping the nickel nanoparticles is catalyzed and graphitized in the heat treatment process, and finally the composite material with the nickel nanoparticles wrapped with the porous carbon-loaded graphene is obtained. According to the preparation method of the wave absorbing material with the nickel nanoparticles wrapped with the porous carbon-loaded graphene, the alga are used as the carbon source, and thus the preparation method is economical and practical; nickel is evenly dispersed onto a carbon material by means of the characteristic that holes of natural algal plants are abundant; a porous carbon material of a network structure is obtained after heat treatment, the nickel particles wrapped with the graphene are dispersed on the surface of the porous carbon material, and thus the material has excellent micro-wave absorption performance.

Description

technical field

[0001] The invention belongs to the technical field of nanocomposite material preparation, and relates to a preparation method of a porous carbon-loaded graphene-coated nano-nickel particle wave-absorbing material. Background technique

[0002] Nickel nanoparticles have attracted enough attention in microwave applications because of their high saturation magnetization and magnetic permeability. These materials have high complex permeability, adjustable resonance frequency, and low eddy current loss in the microwave range, and are expected to become high-density recording media, magnetic field sensors, or electromagnetic wave absorbing materials. However, the large specific surface area and high reactivity of nickel nanoparticles are easy to cause agglomeration and oxidation, and the density is high, so they are not suitable for direct application. Graphene, as a single electrical loss material, is difficult to make absorbing materials with a wide absorption ...

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