MnO2 nanostructures deposited on graphene foams for broadband and lightweight electromagnetic absorption

In this work, MnO 2 -deposited graphene foams (MnO 2 /GFs) were synthesized using a simple hydrothermal method . By controlling the content of MnO 2 deposited on the surface of graphene skeleton, a series of MnO 2 /GFs composites are easily synthesized. Benefiting from the well-designed interconnected 3D porous network structure and strong interfacial polarization between MnO 2 nanoparticles and graphene skeleton, the MnO 2 /GFs composite displays excellent microwave absorbing properties. The optimized MnO 2 /GFs nanocomposite achieves the strongest electromagnetic absorption with a reflection loss (RL) of −53 dB and the qualified absorption bandwidth is up to 7.0 GHz. The results may provide some valuable design guidelines for lightweight, wide-band, and highly efficient electromagnetic wave absorption materials.