Synthesis and enhanced electromagnetic absorption properties of polypyrrole–BaFe12O19/Ni0.8Zn0.2Fe2O4 on graphene nanosheet

The polypyrrole(PPy)–BaFe12O19/Ni0.8Zn0.2Fe2O4 was produced by an in situ polymerization, and then PPy–BaFe12O19/Ni0.8Zn0.2Fe2O4–graphene composites were prepared by a deoxidation technique. The structures, morphology and electromagnetic properties of the samples were characterized by various instruments. Results show that PPy–BaFe12O19/Ni0.8Zn0.2Fe2O4 nanoparticles are dispersed on the graphene sheets. The saturation magnetization of the composites decrease from 33.93 to 26.93 emu/g with increasing the contents of graphene. However, the conductivities of the composites increase from 0.33 to 1.32 S/cm. Measurement of electromagnetic parameters indicates the reflection loss of the composites with 10% graphene is below −10 dB at 7.8–11.6 GHz and its maximum loss value is –25.5 dB at 9.8 GHz. The bandwidth corresponding to the reflection loss below –10 dB is 3.8 GHz.