Abstract
Ba x Sr1−x Fe12O19/Fe3O4/polyacrylic acid/polythiophene (Ba x Sr1−x Fe12O19/Fe3O4/PAA/PTh) nanocomposites with multi-core–shell structure were successfully synthesized by four steps. The samples were characterized by FTIR, X-ray diffraction (XRD), transmission electron microscope (TEM), vibrating sample magnetometer, and radar absorbing material reflectivity far-field radar cross-section method, respectively. XRD and TEM results indicated that the obtained nanoparticles have multi-core–shell morphology. The magnetic properties and microwave absorption analyses reveal that there are interphase interactions at the interface of Ba x Sr1−x Fe12O19, Fe3O4, PAA, and PTh, which can affect the magnetic properties and microwave absorption properties of the samples. The microwave-absorbing properties of nanocomposites were investigated at 8–14 GHz. A typical layer absorber exhibited an excellent microwave absorption with a −26 dB maximum absorption at 14 GHz. Compared with core material, the coercivity and saturation magnetization of multi-core–shell nanocomposites decrease obviously, but the microwave absorption properties of nanocomposites are improved greatly. The results show that these composite could be used as advancing absorption and shielding materials due to their favorable microwave-absorbing properties.
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