Efficient Electromagnetic Wave Absorption of Porous CoO-Co@RGO Composites with Optimized Impedance Matching Derived from Metal-Organic Frameworks

In this study, we have successfully synthesized porous CoO-Co@RGO composites using GO and Co-based metal-organic frameworks (MOFs) as precursors. Due to particular structures and advantageous characteristics, the synthesized porous CoO-Co@RGO composites exhibit outstanding electromagnetic (EM) wave absorbing properties with a filler loading of 10wt.% in wax matrix. The maximum reflection loss (RL) of the prepared porous CoO-Co@RGO was -34:22 dB with 2.1mm thickness, and the effective absorption bandwidth as wide as 6.24GHz (11.76-18GHz), which covers the full Ku-band. Remarkably, the achieved all values ofRL were under -10 dB with 1.05.0mm thickness, the corresponding to bandwidth range can be tuned to 13.84GHz (4.16-18GHz). The superior absorbing performance is attributed to suitable magnetic loss, high dielectric loss and large attenuation mainly caused by conduction loss and polarization relaxation.