▎ 摘　　要

In this work, MnO2-deposited graphene foams (MnO2/GFs) were synthesized using a simple hydrothermal method. By controlling the content of MnO2 deposited on the surface of graphene skeleton, a series of MnO2/GFs composites are easily synthesized. Benefiting from the well-designed interconnected 3D porous network structure and strong interfacial polarization between MnO2 nanoparticles and graphene skeleton, the MnO2/GFs composite displays excellent microwave absorbing properties. The optimized MnO2/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. (C) 2019 Elsevier B.V. All rights reserved.