Structure and electromagnetic properties of single-crystalline Fe3O4hollow nanospheres

Yajing Zhang, Siu Wing Or, Zhidong Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)

Abstract

Magnetite (Fe3O4) hollow nanospheres with an average diameter of 300 nm and an average shell thickness of 40 nm were synthesized by a surfactant-free solvothermal reduction method, and their structure and electromagnetic (EM) properties were investigated. The Fe3O4hollow nanospheres showed single-crystalline features along the [111] crystal growth direction and a ferrimagnetic behavior at room temperature. The Fe3O4hollow nanosphere/paraffin composites exhibited a flatter response in the real complex relative permittivity (ε′) and a lower value of ∼0.5 in the imaginary complex relative permittivity (ε″) in comparison with other Fe3O4-based nanomaterials because of the enhanced electrical resistivity. Their imaginary complex relative permeability (μ″) displayed a resonance peak at ∼4 GHz and a negative value up to -0.03 in the 17.2-18 GHz range due to the dissipation of EM energy in the cavity of the hollow nanospheres. Their reflection loss (RL) exceeded -10 dB from 3.1 to 10.1 GHz at a thickness of 2.6-5 mm and attended an optimal value of -43.5 dB at 4 GHz at 5 mm thickness as a result of an effective complementation between the dielectric and magnetic losses.
Original languageEnglish
Pages (from-to)4664-4669
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Volume14
Issue number6
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • Dielectric and magnetic losses
  • Electromagnetic wave absorption
  • Reflection loss
  • Solvothermal reduction method

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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