Facile sonochemical synthesis of high-moment magnetite (Fe 3O4) nanocube

Mohamed Abbas, Migaku Takahashi, Cheolgi Kim

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)

Abstract

Monodisperse magnetite nanocubes with uniform particle size of about 80 nm have been synthesized in aqueous medium by single reaction sonochemical method using inexpensive and non-toxic metal salt (FeSO4·7H 2O) as reactant. The crystallinity of the magnetite nanocube is enhanced by annealing treatment up to 600 C with uniform shape and size distribution, after that a distortion in shape and a broad size distribution are obtained at 700 C annealing temperature. The magnetic characterization of the nanoparticles reveals saturation magnetization of 91 emu/g at 5 K for as-synthesized sample and 94.8 emu/g for the sample which annealed at the temperature of 600 C in a vacuum chamber. However, the saturation magnetization has been observed to decrease with further increase in annealing temperature and this has been attributed to the presence of a thin magnetic dead layer at the surface caused by shape anisotropy distortion and broken exchange bonds, and spin canting on the surface of the particles in addition to the formation of a small amount of maghemite phase.

Original languageEnglish
Article number1354
JournalJournal of Nanoparticle Research
Volume15
Issue number1
DOIs
Publication statusPublished - 2013 Jan
Externally publishedYes

Keywords

  • Annealing temperature
  • Magnetic properties
  • Nanocube
  • Sonochemistry
  • Spin canting

ASJC Scopus subject areas

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

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