Abstract Structural, optical, and absorption properties of nano-composites iron powder/carbon nano-sphere/polyvinyl alcohol (Fe/CNs/PVA) for electromagnetic (EM) wave absorber based on CNs from bamboo fiber studied by X-ray diffraction (XRD), Fourier transforms infra-red (FTIR), and vector network analyzer (VNA), respectively. The existence of the diffraction peaks identified by crystal orientation (hkl) (004), (224) and (115) with FWHM, strain, and working frequency increases with increasing the activation temperature indicated the formation of the new structures. These findings consistent with the distance (Δ(LO-TO)) between two optical phonon vibrations mode increases indicated that, the stable covalent bonding formation of Fe/CNs/PVA particles increase with increasing the temperature activation of CNs. Temperature activation of the CNs play an important role in expanding the frequency up to 5.56 GHz with reflection loss (RL) −23.16 dB, indicated that a new type absorber for attenuating 99% EM wave. This study shows that the FTIR spectra could be useful for determining the optical properties, phonon vibration, dielectric function, and energy loss function of composite Fe/CNs/PVA.

中文翻译：

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由红外光谱确定的光学特性和由复合材料 Fe/CNs/PVA 的电磁波吸收衍射光谱确定的结构特性

摘要 通过 X 射线衍射 (XRD) 研究了基于竹纤维 CNs 的用于电磁 (EM) 波吸收剂的纳米复合铁粉/碳纳米球/聚乙烯醇 (Fe/CNs/PVA) 的结构、光学和吸收性能。 )、傅里叶变换红外 (FTIR) 和矢量网络分析仪 (VNA)。由晶体取向 (hkl) (004)、(224) 和 (115) 确定的衍射峰的存在与 FWHM、应变和工作频率随着活化温度的增加而增加，表明新结构的形成。这些发现与两个光学声子振动模式之间的距离 (Δ(LO-TO)) 增加一致，表明 Fe/CNs/PVA 颗粒的稳定共价键形成随着 CNs 温度活化的增加而增加。CNs 的温度激活在将频率扩展到 5.56 GHz 方面起着重要作用，反射损耗 (RL) -23.16 dB，表明是一种新型吸收器，可衰减 99% EM 波。该研究表明，FTIR 光谱可用于确定复合 Fe/CNs/PVA 的光学性质、声子振动、介电函数和能量损失函数。