Iron oxide shell as the oxidation-resistant layer in SmCo5 @ Fe2O3 core-shell magnetic nanoparticles.

Academic Article


  • This paper presents a synthesis of magnetic nanoparticles of samarium cobalt alloys and the use of iron oxide as a coating layer to prevent the rapid oxidation of as-made Sm-Co nanoparticles. The colloidal nanoparticles of Sm-Co alloys were made in octyl ether using samarium acetylacetonate and dicobalt octacarbonyl as precursors in a mixture of 1,2-hexadecanediol, oleic acid, and trioctylphosphine oxide (TOPO). Such Sm-Co nanoparticle could be readily oxidized by air and formed a CoO antiferromagnetic layer. Exchange biasing was observed for the surface oxidized nanoparticles. In situ thermal decomposition of iron pentacarbonyl was used to create iron oxide shells on the Sm-Co nanoparticles. The iron oxide shell could prevent Sm-Co nanoparticles from rapid oxidation upon the exposure to air at ambient conditions.
  • Authors

  • Teng, Xiaowei
  • Yang, Hong
  • Status

    Publication Date

  • January 2007
  • Keywords

  • Cobalt
  • Ferric Compounds
  • Hot Temperature
  • Iron
  • Magnetics
  • Microscopy, Electron, Transmission
  • Models, Chemical
  • Nanoparticles
  • Nanotechnology
  • Oxygen
  • Samarium
  • Temperature
  • X-Ray Diffraction
  • Digital Object Identifier (doi)

    Pubmed Id

  • 17455504
  • Start Page

  • 356
  • End Page

  • 361
  • Volume

  • 7
  • Issue

  • 1