Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 55, Issue 2, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2018.2866308
Keywords
Core/shell structure; decoration; electromagnetic (EM) absorption properties; hybrid; nanocapsules
Funding
- Research Grants Council of the HKSAR Government [15217917]
- Hong Kong Polytechnic University [G-YBLL, G-YBPP]
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We report an obvious improvement in gigahertz electromagnetic (EM) absorption properties in novel core/shell-structured magnetic/dielectric nanocapsule-decorated nanocapsule hybrids, featuring Fe/C nanocapsules of similar to 4 nm mean diameter decorated on the surfaces of Fe2B/C nanocapsules of similar to 50 nm mean diameter (denoted as Fe/C@Fe2B/C hybrids), as a result of the simultaneously enhanced dielectric and magnetic losses by an increased interfacial polarization at the Fe/C and Fe2B/C heterogeneous interfaces and an additional tip effect by the decoration of small Fe/C nanocapsules. The phase, morphology, microstructure, and magnetization of the Fe/C@Fe2B/C hybrids are investigated using various methods, and their EM absorption properties are evaluated in paraffin-bonded composites with 50 wt.% hybrids over the 2-18 GHz range. The results indicate a giant reflection loss (RL) of -49.5 dB at 10.5 GHz and a broad effective absorption bandwidth (for RL < -10 dB) of 8 GHz at a thin composite thickness of 2.1 mm. An extremely broad coverage of effective absorption bandwidth from 2.5 to 18 GHz is obtained at a very wide composite thickness range of 1-6 mm. The present study provides a new prospective for realizing high-performance EM absorbers at gigahertz frequencies.
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