▎ 摘　　要

The relative shielding effectiveness (SE) of Fe3O4-rGO NC (nanocomposite) in the X-band frequency region is reported. The Fe3O4-rGO NC with different ratios (2:1, 1:1 and 1:2) were fabricated by polyol method and were further characterized by various physicochemical techniques. The Fe3O4-rGO NC (1:2) with 1 mm thickness shows improved total shielding efficiency of 59.41 dB at 8.29 GHz for microwave absorption. The Fe3O4 nanoparticles (NPs) (similar to 5 nm) possess a significantly higher maximum saturation (M-s) 34.92 emu/g for enhanced microwave absorption. The Fe3O4-rGO NC (1:2) has exhibited higher total shielding efficiency of 59.41 dB due to its enhanced dielectric properties permeability (mu' = 1.65 at 8.59 GHz and mu" = 0.76 at 11.59 GHz); permittivity (epsilon' = 91.38 at 11.5 GHz and epsilon" = 67.54 at 8.5 GHz), and good attenuation ability. The effective shielding efficiency (SE) of Fe3O4-rGO (1:2) NC found to be 99.9995%.