Low temperature synthesis of iron containing carbon nanoparticles in critical carbon dioxide

Takashi Hasumura, Takahiro Fukuda, Raymond L.D. Whitby, Ortrud Aschenbrenner, Toru Maekawa

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


We develop a low temperature, organic solvent-free method of producing iron containing carbon (Fe@C) nanoparticles. We show that Fe@C nanoparticles are self-assembled by mixing ferrocene with sub-critical (25.0 °C), near-critical (31.0 °C) and super-critical (41.0 °C) carbon dioxide and irradiating the solutions with UV laser of 266-nm wavelength. The diameter of the iron particles varies from 1 to 100 nm, whereas that of Fe@C particles ranges from 200 nm to 1 μm. Bamboo-shaped structures are also formed by iron particles and carbon layers. There is no appreciable effect of the temperature on the quantity and diameter distributions of the particles produced. The Fe@C nanoparticles show soft ferromagnetic characteristics. Iron particles are crystallised, composed of bcc and fcc lattice structures, and the carbon shells are graphitised after irradiation of electron beams.

Original languageEnglish
Pages (from-to)53-58
Number of pages6
JournalJournal of Nanoparticle Research
Issue number1
Publication statusPublished - Jan 1 2011


  • Carbon
  • Composite nanomaterials
  • Critical carbon dioxide
  • Ferrocene
  • Iron
  • Nanoparticles
  • UV laser

ASJC Scopus subject areas

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

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