Abstract
BaFe12O19 – Ni0.8Zn0.2Fe2O4 /Polypyrrole composite film [including three doping acids, dodecyl benzene sulfonic acid (DBSA), camphor sulfonic acid (CSA) and p-toluenesulfonic acid (TSA)] was prepared by sol–gel method and in situ chemical oxidative polymerization. The structure, morphologies, conductivities, magnetic properties and microwave absorption properties of the composite film were characterized by using XRD, FESEM, FTIR, Four-probe tester, VSM and Vector network analyzer. The results show that the conductivity of acid-doped Polypyrrole composite film is higher than that of pure Polypyrrole composite film. The saturation magnetization (Ms) and remanent magnetization (Mr) of the composite film are lower than those of BaFe12O19 – Ni0.8Zn0.2Fe2O4 film. However, the electromagnetic properties are in the contrary. The microwave absorption properties of the composite film are much better than those of BaFe12O19 – Ni0.8Zn0.2Fe2O4 , which mainly depends on the increasing of the dielectric loss. A minimum reflection loss of the DBSA-doped composite film is −17.6 dB at 9.3 GHz with the thickness at 3.0 mm.
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