Ni（OH）₂/rGo Composites Preparation And Electromagnetic Properties Study

The rapid development of electromagnetic technology and the wide application of electronic equipment not only facilitate human life,but also bring a lot of electromagnetic radiation,causing electromagnetic pollution problem.Based on this,the research and development of absorbing materials is imminent.The poor stability,high density and narrow absorption band of traditional absorbing materials are all urgent problems to be solved by researchers.In this paper,Ni（OH）₂/r GO composites were prepared,characterized,electromagnetic absorption characteristics（attenuation characteristics,impedance matching,reflection loss value）and electromagnetic wave absorption mechanism were studied.The Ni（OH）₂/r GO matrix composite was obtained by hydrothermal reduction self-assembly method.Excellent absorption characteristics were achieved by adjusting the type of reducing agent and the design of components.The minimum absorption loss of Ni（OH）₂/Cu/r GO matrix composite was-41.5 d B when the thickness of absorbing layer was 3.1 mm.The corresponding effective bandwidth is 3.83 GHz.Ni（OH）₂/r GO matrix composites possess multi-band absorption properties,which is mainly due to the synergistic action of multiple loss mechanisms.This topic through the design of different components,different phase interface,improve the absorption performance of Ni（OH）₂/r GO composite,reveal the synergistic effect of interface polarization,electron polarization,multiple scattering and multiple reflection under multiple loss mechanism.It provides a new idea for developing a new type of absorbent material with wide band,light weight and good absorbent performance.