Preparation method of nanometer chain-like core-shell type nickel/polyaniline composite wave absorption material

Abstract

The invention discloses a preparation method of a nanometer chain-like core-shell type nickel/polyaniline composite wave absorption material. The preparation method comprises the following steps of utilizing the reducibility of hydrazine hydrate, reducing nickel salt with liquid phase under normal pressure, and preparing a nickel nanometer chain which is formed by self assembling spherical particles in uniform size; then coating the surface of the nanometer chain with polyaniline by using an in-situ polymerization method, and acquiring the nanometer chain-like core-shell type nickel/polyaniline composite wave absorption material, wherein the nanometer chain-like core-shell type nickel/polyaniline composite wave absorption material is of a core-shell structure and takes a magnetic metal nickel nanometer chain as a core and the polyaniline as a conductive polymer as a shell layer. According to the preparation method provided by the invention, the nanometer chain which is formed by self assembling the nickel nanospheres is utilized as a magnetic core, the magnetic anisotropy is strengthened through the geometric effect, and the microwave permeability of a core-shell structure whole body is further improved in the premise of ensuring dielectric loss, so that impedance matching of the wave absorption material is improved, surface reflection of electromagnetic waves is lowered, and the wave absorption performance of the material is improved.

Description

technical field [0001] The invention relates to a preparation method of a self-assembled composite nano wave-absorbing material, in particular to a preparation method of a nano-chain core-shell nickel / polyaniline composite wave-absorbing material, which belongs to the field of wave-absorbing functional materials. Background technique [0002] The application of wave-absorbing materials and devices is currently the main solution for electronic and electrical products to resist electromagnetic radiation and electromagnetic interference, and is also an important means to improve the electromagnetic compatibility (EMC) of products. It is currently widely used in civilian and military fields. The core-shell nanostructure effectively superimposes and expands the performance of traditional absorbing materials at the micro-nano scale, and introduces new physical mechanisms such as quantum effects, interface effects, and electromagnetic coupling, which greatly improves the electromagn...

AI Technical Summary

Problems solved by technology

However, in the electromagnetic wave frequency band, compared with the high dielectric constant generally possessed by magnetic metals and conductive polymers, the relatively low relative permeability is difficult to match, resulting in the increase of electromagnetic wave incident impedance and surface reflection, and the core-shell structure It is difficult to form effective electromagnetic wave absorption in a wide frequency band, and this impedance matching problem also seriously hinders the development and application of broadband electromagnetic wave absorption materials based on core-shell nanostructures.

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