FeSn2/defective onion-like carbon core-shell structured nanocapsules for high-frequency microwave absorption

Dandan Han, Siu Wing Or, Xiaorui Dong, Bao Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

26 Citations (Scopus)

Abstract

The rapid development of microelectric devices has stimulated the research interest of GHz frequency electromagnetic wave absorbing materials. FeSn2/defective onion-like carbon core-shell structured nanocapsules have been synthesized by an arc-discharge method, in which liquid ethanol works as carbon source. The electromagnetic properties of FeSn2/C nanocapsules (40 wt%)-paraffin composite have been investigated in 2–18 GHz. Three Debye dipolar relaxation processes may exist in FeSn2@C nanocapsules, originating from an integrally dielectric polarization of defective onion-like carbon and FeSn2nanoparticles and the interfacial polarization between FeSn2core and C shell. FeSn2@C nanocapsules present resonant dielectric loss and antiresonant magnetic loss in 12–18 GHz, revealing energy transform from the permeability to permittivity. Based on a transmission line theory, more than 90% of the electromagnetic power can be attenuated at 2–18 GHz when an appropriate absorber thickness between 1.6 and 10.0 mm is chosen. Impedance matching and the EM wave attenuation in the interior of the absorber are used to understand the good EM performance. The good performances are ascribed to the defective onion-like carbon shell, the interface between core and shell and the desirable impedance match.
Original languageEnglish
Pages (from-to)2605-2611
Number of pages7
JournalJournal of Alloys and Compounds
Volume695
DOIs
Publication statusPublished - 25 Feb 2017

Keywords

  • Core-shell structure
  • FeSn 2
  • Microwave absorbing materials
  • Onion-like carbon

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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