Polymeric and Soft Materials Section, National Physical Laboratory (CSIR), Dr. K. S. Krishnan Road, New Delhi 110012, India.
ACS Appl Mater Interfaces. 2010 Mar;2(3):927-33. doi: 10.1021/am900893d.
The present paper reports the complex permittivity, permeability, and microwave absorption properties of core shell type poly (3,4-ethylenedioxy thiophene) (PEDOT) nanocomposite with barium ferrite, synthesized by in situ emulsion polymerization, in the 12.4-18 GHz frequency range. High-resolution transmission electron microscopy (HRTEM) studies reveal the formation of core-shell type morphology with ferrite particles (60-80 nm) as the center while the polymer (PEDOT) formulates the outer shell of the composite. The presence of barium ferrite nanoparticles in the polymer matrix includes the magnetic losses, which mainly arise from the magnetic hysteresis, domain-wall displacement, and eddy current loss. The higher dielectric (epsilon'' = 23.5) and magnetic loss (micro'' = 0.22) contributes to the microwave absorption value of 22.5 dB (>99% attenuation) and are found to increase with the amount of ferrite constituents. The polymer was further characterized through Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD).
本文报道了通过原位乳液聚合合成的核壳型聚（3,4-亚乙基二氧噻吩）（PEDOT）纳米复合材料在 12.4-18GHz 频率范围内的复介电常数、磁导率和微波吸收性能。高分辨率透射电子显微镜（HRTEM）研究表明，形成了核壳型形态，铁氧体颗粒（60-80nm）为中心，而聚合物（PEDOT）构成复合材料的外壳。铁氧体纳米颗粒存在于聚合物基体中，包括磁损耗，主要源于磁滞、畴壁位移和涡流损耗。较高的介电常数（epsilon''=23.5）和磁损耗（micro''=0.22）有助于微波吸收值达到 22.5dB（>99%衰减），并发现其随着铁氧体成分的增加而增加。聚合物进一步通过傅里叶变换红外光谱（FTIR）、能量色散 X 射线光谱（EDS）和 X 射线衍射（XRD）进行了表征。
