中文摘要：

采用原位掺杂聚合法，将聚苯胺（PANI）对粒径在60～80nm的M型钡铁氧体颗粒（BaFe12O19）进行了包覆，得到了具有棒状结构的复合材料，通过X射线衍射（XRD）、傅里叶变换红外光谱（FFIR）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）等测试手段对材料的形貌和结构进行了表征．结果表明，PANI链段与BaFe12O19颗粒之间存在作用力．使用振动磁强计和四探针法测定了复合材料的磁性能与电性能后发现，饱和磁化强度与矫顽力均随聚苯胺含量的增加呈规律性下降趋势，而电导率呈上升趋势，复合材料的吸收特性测试结果表明，该材料反射率小于-20dB时，带宽可以达到15．07GHz．同时详细地讨论了纳米复合材料的聚合机理及相互作用。

英文摘要：

The polyaniline （PANI）-barium ferrite nanocomposite with magnetic behavior was synthesized by in situ polymerization of aniline in the presence of BaFe12O19 nanoparticles with 60-80 nm diameters. The structure, morphology and magnetic properties of the samples were characterized by powder X-ray diffraction （ XRD）, Fourier transform infrared （FTIR） spectrum, scanning electron microscopy （ SEM ）, transmission electron microscopy （TEM） and vibrating sample magnetometer（VSM） technique. The results of spectroanalysis indicate that there was interaction between PANI chains and ferrite particles. The composite exhibited the hysteresis loops of the ferromagnetic nature. The saturation magnetization and coercivity of composite decreased greatly compared with barium ferrite. The absorbing bandwidth less than - 20 dB is 15.07 GHz. And the polymerization mechanism and interactions in the nanocomposites were also discussed.