Three-dimensional reduced graphene oxide/CoFe2O4 composites loaded with LAS particles for lightweight and enhanced microwave absorption properties

The three-dimensional reduced graphene oxide (RGO)/CoFe₂O₄ composites have been synthesized by one-pot hydrothermal method. Different quantities of lithium-aluminum-silicate (LAS) glass-ceramics have been introduced to coat the RGO/CoFe₂O₄ sheets. The stacked LAS and CoFe₂O₄ nanoparticles are evenly distributed on the surface of RGO films and the microwave absorbing properties of LAS@RGO/CoFe₂O₄ composites are greatly enhanced owing to the introduction of LAS. With the thickness of only 2.3 mm, the corresponding reflection loss (RL) value of the absorber reaches −50.0 dB. Moreover, it should be noted that the effective bandwidth can be up to 6.16 GHz for only 2.0 mm absorbing layer. The outstanding microwave absorption performance is mainly attributed to excellent impedance matching and multi-dipole polarization. This research is expected to provide a new direction to the design of high-performance microwave absorbing materials.