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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
Published on: September 19, 2020
Microwave absorption properties of core double-shell FeCo/C/BaTiO₃ nanocomposites
Jingjing Jiang1, Da Li, Dianyu Geng
1Shenyang National Laboratory for Materials Science, Institute of Metal Research and International Center for Materials Physics, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China. dali@imr.ac.cn.
Abstract:
Microwave absorption properties of core double-shell FeCo/C/(x)BaTiO₃ nanocomposites were investigated in the 1-18 GHz frequency range. High resolution transmission electron microscopy studies reveal the core double-shell type nanocomposite with FeCo nanoparticles as the center, while carbon and BaTiO₃ are the inside and the outside shells, respectively. Enhanced relative permittivity made the core double-shell FeCo/C/(x)BaTiO₃ nanocomposites with better electromagnetic impedance matching than that of a FeCo/C and BaTiO₃ mixture. Reflection loss (RL) values of FeCo/C/(20 wt%)BaTiO₃-paraffin composite are almost double those of the FeCo/C-paraffin composite at the absorbent thickness from 2 to 7.5 mm due to enhanced interfacial effects. The RL value of the FeCo/C/(20 wt%)BaTiO₃-paraffin composite is -41.7 dB at 11.3 GHz at the absorbent thickness of 2 mm and a broad absorption bandwidth of 5.1 GHz (RL values exceeding -10 dB) covers the 9.4-14.5 GHz frequency range.
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