Optical properties determined from infrared spectroscopy and structural properties from diffraction spectroscopy of composites Fe/CNs/PVA for electromagnetic wave absorption

摘要

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 (Delta(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.