Experimental evidence of structural evolution in ultrafine cobalt particles stabilized in different polymers - From a polytetrahedral arrangement to the hexagonal structure

F. Dassenoy, M. J. Casanove, P. Lecante, M. Verelst, E. Snoeck, A. Mosset, T. Ould Ely, C. Amiens, B. Chaudret

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Abstract

Ultrafine cobalt particles have been reproducibly synthesized by decomposition of an organometallic precursor in the presence of a stabilizing polymer. The size of the stable monodisperse colloids thus obtained is seen to strongly depend on the nature of the polymer: around 4.2 nm diameter in polyphenylenoxide (PPO) and around 1.4 nm diameter in polyvinylpyrrolidone (PVP). Investigations by wide angle x-ray scattering (WAXS) and high-resolution transmission electron microscopy (HRTEM) give evidence for a size dependence of the structural organization, and hence for a close relationship between structure and synthesis conditions. Co/PPO particles exhibit a hexagonal compact structure with the metal-metal bond length of the bulk material while Co/PVP ones display an original structure. We show that the unusual features of the experimental data in Co/PVP clearly point to a nonperiodic polytetrahedral structure. Successful simulations of the HRTEM and WAXS results have been obtained using models built on the basis of a polytetrahedral arrangement.

Original languageEnglish
Pages (from-to)8137-8145
Number of pages9
JournalJournal of Chemical Physics
Volume112
Issue number18
DOIs
Publication statusPublished - May 8 2000

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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    Dassenoy, F., Casanove, M. J., Lecante, P., Verelst, M., Snoeck, E., Mosset, A., Ould Ely, T., Amiens, C., & Chaudret, B. (2000). Experimental evidence of structural evolution in ultrafine cobalt particles stabilized in different polymers - From a polytetrahedral arrangement to the hexagonal structure. Journal of Chemical Physics, 112(18), 8137-8145. https://doi.org/10.1063/1.481414