Preparation and low-frequency microwave-absorbing properties of MWCNTs/Co-Ni/Fe3O4 hybrid material

MWCNTs/Co-Ni/Fe3O4 hybrid material has been successfully prepared by electroless plating and coprecipitation method, which is applied to the low-frequency microwave absorption. Their surface morphology, structure, magnetism and electromagnetic properties in the low-frequency range of 1-4 GHz were characterized by field-emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and vector network analyzer. Results indicated that magnetic Co-Ni/Fe3O4 particles were attached on the surface of multi-walled carbon nanotubes successfully. The saturation magnetization of MWCNTs/Co-Ni/Fe3O4 hybrid materials was 68.6 emu/g and the coercivity is 17.9 Oe. The electromagnetic and microwave absorbing properties analysis in the low-frequency range of 1-4 GHz indicated that the hybrid material exhibited excellent magnetic loss and the maximum reflection loss could reach -13.57 dB at 1.51GHz with 1.05 GHz bandwidth below -5 dB.