Preparation and wave-absorbing properties study of cenosphere/barium ferrite/polyaniline composites

The composite material of cenosphere/barium ferrite/polyaniline was successfully prepared by sol-gel self-propagating combustion method combining in-situ doping polymerization deposition technique.The morphology,crystal structure and composition of the samples were characterized by scanning electron microscope(SEM),X-ray diffraction(XRD) and Fourier transform infrared spectroscopy(FTIR).In addition,the electromagnetic parameters were determined by vector network analyzer in the frequency range of 2–18 GHz.The results show that the maximum dielectric loss and magnetic loss of the prepared sample are 0.30 and 0.52,respectively.Meanwhile,the maximum reflection loss of the prepared sample reaches –33.74 dB at 7.1 GHz,and the absorption bandwidth is 3.2 GHz at –20 dB when the thickness of absorption layer of the prepared sample is 3.0 mm.