A nickel-boron-doped cobalt-based sheet carbon microwave absorbing material and its preparation method

CN117961078BActive Publication Date: 2026-05-26SHAANXI UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHAANXI UNIV OF SCI & TECH
Filing Date
2023-12-21
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies suffer from complex and time-consuming preparation processes, inflexible control, inability to achieve large-scale production, poor maximum reflection loss and impedance matching, and low yield.

Method used

A method for preparing nickel-boron-doped cobalt-based sheet carbon microwave absorbing materials is adopted. Two-dimensional sheet materials are formed by chemical etching of cobalt-based boron imidazole frameworks, followed by high-temperature pyrolysis treatment with nickel ions to form porous carbon materials, thereby enhancing the impedance matching and conductivity of the materials.

Benefits of technology

The material is easy to prepare and suitable for large-scale industrial production. The minimum reflection loss value of the material is -60.1dB, the effective absorption bandwidth is 6.24GHz, and it has excellent electromagnetic wave absorption performance.

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Abstract

This invention belongs to the field of electromagnetic wave absorbing materials technology, specifically relating to a nickel-boron-doped cobalt-based layered carbon absorbing material and its preparation method. This invention utilizes a cobalt-based boron imidazole precursor framework as a template, and forms a two-dimensional layered layered double hydroxide (LDH) through a chemical oxidation etching process using nickel ions. This LDH is then subjected to high-temperature reduction to obtain the nickel-boron-doped cobalt-based layered carbon material. This material leverages the unique properties of two-dimensional materials to achieve high impedance matching, allowing electromagnetic waves to enter the absorber at a significant rate. Furthermore, the material's excellent dielectric polarization and magnetic coupling attenuate the electromagnetic waves entering the absorber. The material achieves a minimum reflection loss of -60.1 dB and a maximum effective absorption bandwidth of 6.24 GHz, giving it excellent electromagnetic wave absorption capabilities. The preparation method of this invention is simple and easy to mass-produce.
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