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

Research output: Contribution to journalArticle

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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
Publication statusPublished - May 8 2000
Externally publishedYes

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Povidone
x ray scattering
Cobalt
Polymers
cobalt
High resolution transmission electron microscopy
transmission electron microscopy
high resolution
polymers
Metals
Scattering
metals
colloids
X rays
Colloids
Bond length
Organometallics
decomposition
synthesis
Decomposition

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Experimental evidence of structural evolution in ultrafine cobalt particles stabilized in different polymers - From a polytetrahedral arrangement to the hexagonal structure. / Dassenoy, F.; Casanove, M. J.; Lecante, P.; Verelst, M.; Snoeck, E.; Mosset, A.; Ould Ely, T.; Amiens, C.; Chaudret, B.

In: Journal of Chemical Physics, Vol. 112, No. 18, 08.05.2000, p. 8137-8145.

Research output: Contribution to journalArticle

Dassenoy, F, Casanove, MJ, 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, vol. 112, no. 18, pp. 8137-8145.
Dassenoy, F. ; Casanove, M. J. ; Lecante, P. ; Verelst, M. ; Snoeck, E. ; Mosset, A. ; Ould Ely, T. ; Amiens, C. ; Chaudret, B. / Experimental evidence of structural evolution in ultrafine cobalt particles stabilized in different polymers - From a polytetrahedral arrangement to the hexagonal structure. In: Journal of Chemical Physics. 2000 ; Vol. 112, No. 18. pp. 8137-8145.
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AU - Snoeck, E.

AU - Mosset, A.

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