(00h) BaM filled core-shell Co2Y@PANI ferrite-polymer composite for enhanced microwave absorption performances

The (00h) BaFe₁₂O₁₉ (BaM) filled Co₂Y@PANI composite with oriented microstructure have been prepared by an in-situ polymerization reaction and a tape-casting method. Firstly, the hexaferrite Ba₂Co₂Fe₁₂O₂₂ (Co₂Y) nanoparticles was modified and coated by polyaniline (PANI) to form a Co₂Y@PANI core-shell composite. Then the Co₂Y@PANI composite with 10 wt% (00h) BaFe₁₂O₁₉ tempaltes were mixed in Polyvinyl Butyral (PVB) matrix and finally formed the Co₂Y@PANI/BaM-T/PVB composite sheet via the tape-casting process. Under the shear forces during the tap-casting, the BaM templates were orderly dispersed in the composite to form an oriented microstructure to enhance the scattering effect. Furthermore, the microwave absorption ability of Co₂Y, Co₂Y@PANI and Co₂Y@PANI/BaM-T in PVB matrix were investigated from 2 to 18 GHz frequency. The maximum reflection loss value of Co₂Y@PANI/BaM-T/PVB composite can reach −66.9 dB at 11.6 GHz with 1.9 mm thin thickness and broad effective bandwidth (RL < −10 dB) about 6.32 GHz. The excellent EMA properties were ascribed to the high performance dielectric-magnetic hierarchical architectures. This work demonstrates the great potential of the structural design utilizing ferrite materials for microwave absorbing application.