Journal
APPLIED SURFACE SCIENCE
Volume 603, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2022.154337
Keywords
FeNi3 and FeNi3@C; Carbon shells; Synergistic effect; Broad bandwidth; EMA performances
Categories
Funding
- Basic Research Project Educational Department of Liaoning Province [LQ2020002]
- Natural Science Foundation of Liaoning Province [2021-BS-186, 2021-NLTS-12-01]
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This study demonstrates the rational design of FeNi3 and FeNi3@C core-shell microspheres for efficient electromagnetic wave absorption in the gigahertz range. The delicate design and synergistic effect of FeNi3 and carbon contribute to impressive absorption performance in the C to Ku band.
The rational design of electromagnetic wave absorption (EMA) materials featured with broadband and high-efficiency in gigahertz (GHz) is still a great challenge. In this study, we prove fabricating FeNi3 and FeNi3@C core-shell microspheres to solve the challenge. The as-prepared FeNi3 microspheres exhibits extremely broad effective absorption bandwidth (EAB, RL >= 10 dB, > 90 % absorbing) of 10.3 GHz (7.7-18.0 GHz) at only 2.0 mm, occupying 64.4 % of the investigated frequency range with a single matching thickness. Such an outstanding EMA performances is credited to strong dielectric loss and magnetic loss. Compared with pristine FeNi3, the delicate design of core-shell structure and tailored synergistic effect of FeNi3 and carbon produce positive reinforcement both in magnetic loss and dielectric loss, endowing FeNi3@C samples with optimized impedance matching and appropriate attenuation ability. As a result, FeNi3@C samples present impressive EMA performances from C to Ku band, especially for FeNi3@C-3, demonstrating its potential of effectively dissipates electromagnetic wave in 6.1-18.0 GHz (RL >= 20 dB, > 99 % absorbing) by simply regulating a thickness of 1.5-2.5 mm. FeNi3 and FeNi3@C feature with optional broad bandwidth (completely covering C, X and Ku band), strong absorption, and thin thickness ensure them a superior EMA material.
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