Abstract This work presents a study of microwave absorption properties of PAni/Fe3O4/PVA nanofiber composites with different ratio of Fe3O4 nanoparticles. The morphology of the composites nanofibers study by Field Emission Scanning Electron Microscopes (FESEM) and Transmission Electron Microscope (TEM) showed that the low content of Fe3O4 nanoparticles presence in the composites nanofibers indicates very much uniform surface, in the composites nanofiber without many bends, but some bends develop at higher content of Fe3O4 nanoparticles as indicated in the TEM image. Image-J software was used to further investigate the diameter of the composites nanofiber and found to be in the range of 152 to 195 nm. The nanofiber composites show excellent electric and magnetic properties and therefore vary with the addition of Fe3O4 nanoparticles in the composites nanofiber. In addition the PAni/Fe3O4/PVA composites nanofibers were further characterized by X-ray diffraction spectra (XRD) and Four Transformation infrared spectra (FTIR). The XRD pattern shows the presence of PAni nanotubes containing Fe3O4 nanoparticles by indicating peaks at 23.4⁰ and 35.43⁰ which was further supported by FTIR analysis. Microwave vector network analyzers (MVNA) were used to estimate the microwave absorption properties of the composites nanofibers. The absorption parameters was found to be −6.4 dB at 12.9 GHz within the range of X-band microwave absorption frequency, this reflection loss is attributed to the multiple absorption mechanisms as a result of the improved of impedance matching between dielectric and magnetic loss of the absorbent materials demonstrating that these materials can be used as protective material for electromagnetic radiation.

中文翻译：

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PAni/Fe3O4/PVA纳米纤维复合材料的制备、表征及X波段微波吸收性能

摘要 本文研究了不同比例 Fe3O4 纳米粒子的 PAni/Fe3O4/PVA 纳米纤维复合材料的微波吸收性能。通过场发射扫描电子显微镜 (FESEM) 和透射电子显微镜 (TEM) 研究的复合材料纳米纤维的形态表明，复合材料纳米纤维中低含量的 Fe3O4 纳米颗粒表明表面非常均匀，复合材料纳米纤维没有很多弯曲，但如 TEM 图像所示，在较高含量的 Fe3O4 纳米颗粒下会出现一些弯曲。Image-J 软件用于进一步研究复合材料纳米纤维的直径，发现其直径范围为 152 至 195 nm。纳米纤维复合材料显示出优异的电学和磁学性能，因此随着复合材料纳米纤维中 Fe3O4 纳米粒子的添加而变化。此外，PAni/Fe3O4/PVA 复合纳米纤维还通过 X 射线衍射光谱 (XRD) 和四变换红外光谱 (FTIR) 进行了表征。XRD 图通过在 23.4⁰ 和 35.43⁰ 处的峰表明存在含有 Fe3O4 纳米颗粒的 PAni 纳米管，FTIR 分析进一步支持了这一点。微波矢量网络分析仪 (MVNA) 用于评估复合材料纳米纤维的微波吸收特性。在 X 波段微波吸收频率范围内，在 12.9 GHz 处发现吸收参数为 -6.4 dB，