Fe/C Nanocapsule-Decorated Fe2B/C Nanocapsule Hybrids with Improved Gigahertz Electromagnetic Absorption Properties

Xianguo Liu, Mingji Zhang, Siu Wing Or, Siu Lau Ho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)


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 4 nm mean diameter decorated on the surfaces of Fe2B/C nanocapsules of 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.

Original languageEnglish
Article number2501205
JournalIEEE Transactions on Magnetics
Issue number2
Publication statusPublished - Feb 2019


  • Core/shell structure
  • decoration
  • electromagnetic (EM) absorption properties
  • hybrid
  • nanocapsules

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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