Electromagnetic response and microwave absorption properties of CF/Fe3O4 absorbing composites

• Published in: Journal of materials science. Materials in electronics Vol. 33; no. 4; pp. 2152 - 2165
• Main Authors: Liang, Yuqi, Yin, Xiaoqing, Zhang, Yuqing, Zheng, Shuangshuang, Wu, Zinuo, Jia, Hongyu, Chen, Yang
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.02.2022; Springer Nature B.V
• Subjects: Carbon; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composite materials; Dielectric properties; Impedance matching; Iron oxides; Magnetic properties; Materials Science; Melamine; Microwave absorption; Nanoparticles; Optical and Electronic Materials; Thickness
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-021-07422-z

In this work, a unique three-dimensional framework structure of carbon foam (CF) was obtained by carbonizing melamine foam at a certain temperature, and its dielectric properties were studied. Then the microwave absorption properties were further improved by adding Fe 3 O 4 magnetic nanoparticles. CF/Fe 3 O 4 absorbing composites were obtained. The CF/Fe 3 O 4 absorbing composites can obtained different electromagnetic parameters of CF/Fe 3 O 4 by adjusting the addition amount of Fe 3 O 4 nanoparticles. When the mass ratio of CF to Fe 3 O 4 is 6:4, the microwave absorption performance is the best. With a thickness of 1.5 mm and a load of 20 wt% of the absorbing material, the reflection loss (RL) can reach − 19.0 dB at 15.7 GHz. When the thickness is 1.5 mm, the effective absorption bandwidth can reach 4.8 GHz (13–17.8 GHz). By adjusting the thickness, it can achieve effective absorption in the range of 3.5–18 GHz. The microwave absorption performance of the synthesized CF/Fe 3 O 4 composites are attributed to the three-dimensional porous structure, which realizes multiple scattering and reflection. Various heterogeneous interfaces such as carbon-air and carbon-Fe 3 O 4 nanoparticles lead to the abundant interface polarization. Not only that, the combination of carbon materials and magnetic particles also further improves its impedance matching performance. This work has not only obtained carbon-based/magnetic particle composite materials with relatively good performance, but also provided new ideas for the design of high-performance magnetic/dielectric composite absorbing materials.