▎ 摘　　要

Metal-organic framework (MOF)@graphene oxide (GO) composite material is a material with the advantages of GO and MOF, which can be an effective electromagnetic wave absorber. This study proposes a simple strategy to prepare MOF@GO composite materials to effectively absorb electromagnetic waves by adjusting Er, Sm, and Yb as well as adding GO to form a 3D cuboid structure. The cuboid structure of trimetal MOF@GO shows excellent microwave absorption, with the filler content being as low as 16 wt %. The reflection loss (RLmin) is -49.1 dB, and the corresponding effective absorption bandwidth (RL < -10 dB) reaches 6.72 GHz. Effective electromagnetic wave absorption stems from conduction loss, dipole and interface polarization, multiple EMW scattering, electron spin, and balanced impedance matching.