Wide angles X-ray scattering (W.A.X.S.) and H.R.E.M. studies on nanoscale cobalt and cobalt oxide colloids

M. Verelst, E. Snoeck, T. Ould Ely, P. Lecante, C. Amiens, C. Roucau, A. Mosset, B. Chaudret

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Monodispersed cobalt nanoparticles have been synthesised by an original method using the decomposition under hydrogen of an organometallic precursor in the presence of a stabilising polymer. Using W.A.X.S. and H.R.E.M. techniques we have characterized the structure of two particle batches, 1.5 and 5nm average size. The finest particles (1.5nm) present a bcc core and a disordered surface whereas the biggest ones (5 nm) are hep as the bulk structure. We then have followed very precisely the air oxidation kinetics at room and moderate temperatures. Room temperature leads to CoO divalent cobalt oxide whereas oxidation at 130°C drives to the Co3O4 spinel form.

Original languageEnglish
Pages (from-to)403-408
Number of pages6
JournalMaterials Science Forum
Volume269-272
Issue numberPART 1
Publication statusPublished - Dec 1 1998

ASJC Scopus subject areas

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

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