Hydrothermal synthesis of surface-modified iron oxide nanoparticles

Seiichi Takami, Teruyuki Sato, Tahereh Mousavand, Satoshi Ohara, Mitsuo Umetsu, Tadafumi Adschiri

Research output: Contribution to journalArticlepeer-review

105 Citations (Scopus)


We synthesized surface-modified iron oxide nanoparticles in aqueous phase by heating an aqueous solution of iron sulfate (FeSO4) at 473 K with a small amount of either n-decanoic acid (C9H19COOH) or n-decylamine (C10H21NH2), which is not miscible with water at room temperature. Transmission electron microscopy showed that the addition of n-decanoic acid or decylamine changed the shape of the obtained nanoparticles. X-ray diffraction spectra revealed that the synthesized nanoparticles were in α-Fe2O3 or Fe3O4 phase while Fourier transform infrared spectroscopy and thermogravimetry indicated the existence of an organic layer on the surface of the nanoparticles. In the synthetic condition, decreased dielectric constant of water at higher temperature increased the solubility of n-decanoic acid or n-decylamine in water to promote the reaction between the surface of iron oxide nanoparticles and the organic reagents. After the synthesis, the used organic modifiers separated from the aqueous phase at room temperature, which may help the environmentally benign synthesis of surface-modified metal oxide nanoparticles.

Original languageEnglish
Pages (from-to)4769-4772
Number of pages4
JournalMaterials Letters
Issue number26
Publication statusPublished - 2007 Oct


  • Hydrothermal synthesis
  • Metal oxide
  • Nanomaterials
  • Nanoparticles
  • Surfaces

ASJC Scopus subject areas

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


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