Synthesis of RGO/Cu@ FeAl2O4 Composites and Its Applications in Electromagnetic Microwave Absorption Coatings

In order to satisfy the requirements of wide frequency bands, the lightweight and strong absorption for the electromagnetic wave absorbing materials, a uniform mixture of FeAl2O4 with RGO/Cu (reduction graphene oxide, RGO) was obtained by the mechanical mixing method, and composite coating was obtained by plasma spraying. The addition of RGO/Cu into FeAl2O4 is conducive to improve the dielectric properties and the impedance matching performance of spinel. When the RGO/Cu composite powders are doped by 10 wt.%, the reflection loss at 15 GHz is -16 dB and the absorption bandwidth is 2 GHz, indicating that the composite material has potential application value in the field of high-frequency wave absorption. The research on the electromagnetic wave absorption mechanism shows that its superior wave absorption performance is determined by the synergistic effect of multiple loss mechanisms such as interfacial polarization, dipole relaxation, natural resonance, exchange resonance, and eddy current loss.

Automated summary

A uniform mixture of FeAl2O4 with RGO/Cu was obtained by mechanical mixing, and a composite coating was obtained by plasma spraying for wide frequency bands, lightweight, and strong absorption in electromagnetic wave absorbing materials. The addition of RGO/Cu into FeAl2O4 improved the dielectric properties and impedance matching performance of spinel. The composite material, doped with 10 wt.% RGO/Cu composite powders, exhibited a reflection loss of -16 dB at 15 GHz and an absorption bandwidth of 2 GHz, indicating its potential application value in high-frequency wave absorption. The research on the electromagnetic wave absorption mechanism revealed that its superior wave absorption performance is determined by the synergistic effect of multiple loss mechanisms such as interfacial polarization, dipole relaxation, natural resonance, exchange resonance, and eddy current loss.