Low-temperature, carbon-free reduction of iron oxide

K. Prabhakaran, K. V P M Shafi, Abraham Ulman, P. M. Ajayan, Y. Homma, T. Ogino

Research output: Contribution to journalArticle

Abstract

We report here that iron oxide can be reduced completely to elemental iron, through a carbon-free and low-temperature reaction. Nanoparticles of Fe2O3 are completely reduced, resulting in the formation of nanoparticles of Fe, on the surfaces of Si or Ge, at ∼740 and ∼440 °C respectively. We show that this phenomenon is due to the oxygen atoms changing the bonding partner from Fe to Si or Ge, followed by the desorption of the respective monoxides. Therefore, the reduction temperature is dictated by the desorption temperatures of SiO or GeO molecules. The nanoparticles thus formed are magnetic and are of uniform size and shape. On graphite surfaces, however, Fe2O3 retains the original stoichiometry even after annealing at higher temperatures.

Original languageEnglish (US)
JournalSurface Science
Volume506
Issue number1-2
DOIs
StatePublished - May 10 2002

Fingerprint

Iron oxides
iron oxides
Carbon
nanoparticles
carbon
Nanoparticles
desorption
Desorption
Temperature
Graphite
stoichiometry
oxygen atoms
graphite
Stoichiometry
iron
annealing
temperature
Iron
Annealing
Oxygen

Keywords

  • Clusters
  • Germanium
  • Iron oxide
  • Oxidation
  • Silicon
  • Silicon oxides
  • Surface chemical reaction
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Prabhakaran, K., Shafi, K. V. P. M., Ulman, A., Ajayan, P. M., Homma, Y., & Ogino, T. (2002). Low-temperature, carbon-free reduction of iron oxide. Surface Science, 506(1-2). https://doi.org/10.1016/S0039-6028(02)01374-2

Low-temperature, carbon-free reduction of iron oxide. / Prabhakaran, K.; Shafi, K. V P M; Ulman, Abraham; Ajayan, P. M.; Homma, Y.; Ogino, T.

In: Surface Science, Vol. 506, No. 1-2, 10.05.2002.

Research output: Contribution to journalArticle

Prabhakaran, K, Shafi, KVPM, Ulman, A, Ajayan, PM, Homma, Y & Ogino, T 2002, 'Low-temperature, carbon-free reduction of iron oxide', Surface Science, vol. 506, no. 1-2. https://doi.org/10.1016/S0039-6028(02)01374-2
Prabhakaran K, Shafi KVPM, Ulman A, Ajayan PM, Homma Y, Ogino T. Low-temperature, carbon-free reduction of iron oxide. Surface Science. 2002 May 10;506(1-2). https://doi.org/10.1016/S0039-6028(02)01374-2
Prabhakaran, K. ; Shafi, K. V P M ; Ulman, Abraham ; Ajayan, P. M. ; Homma, Y. ; Ogino, T. / Low-temperature, carbon-free reduction of iron oxide. In: Surface Science. 2002 ; Vol. 506, No. 1-2.
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