Urchin-like ni microspherical structure with enhanced magnetic loss for thin microwave absorber at gigahertz

Yuping Sun, Zhengwu Pan, Hongming Long, Siu Wing Or, Siu Lau Ho, Chao Feng, Xianguo Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

We describe in this report a wet chemical reduction synthetic strategy for synthesizing urchin-like Ni microspherical structures, in which the nanowires self-assembled by Ni nanoparticles with the size of 5-20nm are assembled in a radial form from the center to the surface of the spherical oriented arrays. Urchin-like Ni microspherical structures exhibit the strong magnetic natural resonance peak at 7.0GHz and superior magnetic loss at 2-18GHz, originated from relatively high anisotropy energy of urchin-like shape. Electromagnetic absorption measurements show that the urchin-like Ni microspherical structures possess outstanding microwave absorption performance at 2-18GHz. An optimal reflection loss of -21.98dB can be observed at 17.4GHz with a matching thickness of 1.4mm and the effective absorption (below -10 dB, 90% absorption) bandwidth is 5 GHz (12-17 GHz) with a thickness of 1.7mm. The excellent microwave absorption performance may be attributed to the good impedance, large attenuation constant and novel magnetic loss ability.
Original languageEnglish
Article number1750034
JournalNano
Volume12
Issue number3
DOIs
Publication statusPublished - 1 Mar 2017
Externally publishedYes

Keywords

  • magnetic loss
  • microwave absorbers
  • nature resonance
  • Ni
  • urchin-like

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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