Sub 5 nm magnetite nanoparticles: Synthesis, microstructure, and magnetic properties

Jun Hua Wu, Seung Pil Ko, Hong Ling Liu, Sangsig Kim, Jae Seon Ju, Young Keun Kim

Research output: Contribution to journalArticlepeer-review

105 Citations (Scopus)


Magnetite particles of 2-4 nm were synthesized by an economic, biocompatible chemical coprecipitation route, with their size tuned by the reaction temperature. The microstructure and morphology of the nanoparticles were characterized by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM), whereas the magnetic properties were investigated by vibrating sample magnetometry (VSM) and superconducting quantum interference device (SQUID). It is found that the nanoparticles demonstrate well-defined superparamagnetic behavior as prepared and after annealing. Distinct lattices were observed which manifest the high crystallinity of such ultrasmall particles and the finite-size effect was revealed by analyzing the corresponding microstructure and magnetism.

Original languageEnglish
Pages (from-to)3124-3129
Number of pages6
JournalMaterials Letters
Issue number14-15
Publication statusPublished - 2007 Jun


  • Coprecipitation
  • Magnetite
  • Nanoparticle
  • Superparamagnetism

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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