Flexible Radar Absorbing Nanocomposites Based on Co-ferrite/Nano Carbon/polymeric epoxy resin

In this work cobalt-ferrite (CoFe2O4) nanoparticles were synthesized by a simple, general, sol-gel auto-combustion method. The electromagnetic (EM) wave absorbing coatings with different weight fractions of nano-carbon and CoFe2O4 (which, arises from both dielectric and magnetic contributions) and polymeric epoxy resin were prepared for the aim of the absorbing coating with thinness, lightness, width, and strength. In this study, the physical properties of current products have improved, hugely. The value of reflection loss (RL) below -5dB can be obtained in the frequency range of 8-12 GHz for the composite with 1%wt nano-carbon and 59%wt CoFe2O4. As the weight fraction of nano-carbon in the composites increased, the minimum reflection loss shifted to lower parts with a matching thickness of 1mm. This research work concludes that hybrid EM absorbents in the form of paints, consisting of nano-sized CoFe2O4 and nano-carbon show excellent broad bandwidths of absorption. The structure, morphology and absorption properties are studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and vector network analyzer (VNA).