Abstract
Surface carboxylation of barium hexaferrite (BaM) has been successfully established, which effectively promotes the interaction of BaM and PANI chains and provides activated points for the preferential growth of polyaniline (PANI) on the surfaces of BaM particles. Based on this, the morphology of PANI layer has been tuned from irregular shape to convex rods and dendrite. Both convex rods and dendrite-like morphology activate electron transport in the PANI chain and enhance interfacial polarization between PANI and BaM, resulting in an improved complex permittivity. BaM particles with PANI convex rods on the surfaces exhibit an excellent and broad microwave absorption due to enhanced electromagnetic wave dissipation in the local micro-domains and the combination of dielectric loss, magnetic loss as well as interfacial loss.
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