Microwave absorption enhancement of e-Fe3O4@C microspheres by core surface modification

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

3 Scopus Citations
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Author(s)

  • Xinjie Yun
  • Qifan Wu
  • Lei Feng
  • Jiancang Shen
  • Jian Chen
  • Lizhe Liu
  • Xinglong Wu

Detail(s)

Original languageEnglish
Article number155307
Number of pages9
Journal / PublicationJournal of Alloys and Compounds
Volume835
Online published29 Apr 2020
Publication statusPublished - 15 Sep 2020

Abstract

Magnetic particles can be combined with carbon materials to prepare core-shell microwave absorbers and the proper core/shell weight ratio yields the optimal absorption effects. However, few studies have focused on the influence of core surface modification on the microwave absorption performance. In this work, e-Fe3O4@C composite microspheres are synthesized by surface etching of core Fe3O4 microspheres in HCl followed by polymerization/carbonization. Core surface modification improves the microwave absorption capability of the e-Fe3O4@C microsphere films. The minimal reflection loss (RLmin) is −54.38 dB at 12.4 GHz for a film thickness of 2.6 mm and the maximum effective bandwidth is extended to 4.1 GHz (3 mm). Etching of the Fe3O4 core surface increases the interfacial contact area consequently enhancing interface polarization and defects created by surface etching produce additional dipole polarization to further increase the dielectric loss. The underlying mechanism is investigated and described. The results reveal a novel and effective strategy to enhance the properties of core-shell microwave absorption materials.

Research Area(s)

  • Dielectric loss, Interface polarization, Microwave absorption, Surface modification

Citation Format(s)

Microwave absorption enhancement of e-Fe3O4@C microspheres by core surface modification. / Yun, Xinjie; Wu, Qifan; Feng, Lei; Shen, Jiancang; Chen, Jian; Chu, Paul K.; Liu, Lizhe; Wu, Xinglong.

In: Journal of Alloys and Compounds, Vol. 835, 155307, 15.09.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal