▎ 摘　　要

CoFe2O4-graphene (CFO-GN) nanocomposites were synthesized by in situ co-precipitation method, involving homogeneous co-precipitation of Co2+ and Fe2+ on the surface of graphite oxides and in situ thermal reduction of graphite oxides simultaneously. The morphology, structure, composition and microwave absorption properties of the nanocomposites were characterized and analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray energy dispersive spectroscope (EDS), thermogravimetric analyzer (TGA), Fourier transform infrared spectroscope (FT-IR) and vector network analyzer (VNA). The results indicate that the CoFe2O4 nanoparticles are uniformly dispersed on the interlayer and surface of the graphene sheets, CoFe2O4-graphene nanocomposites possess dielectric loss and magnetic loss, and exhibit excellent microwave absorption properties. The reflection losses of the nanocomposites with 88.62wt% and 74.53wt% CoFe2O4 are up to -11.0 dB and -12.4 dB, respectively, the bandwidths of reflection loss below -8 dB are 2.0 GHz and 4.3 GHz, respectively. The nanocomposites with higher content of graphene exhibit higher dielectric loss and reflection loss, wider absorption band, and thus exhibit better microwave absorption properties.