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Article Dans Une Revue Nanotechnology Année : 2008

Epitaxial growth of tungsten nanoparticles on alumina and spinel surfaces

L.A. Diaz
  • Fonction : Auteur
S. Lopez-Esteban
  • Fonction : Auteur
Carlos Pecharroman
  • Fonction : Auteur
A, Esteban-Cubillo
  • Fonction : Auteur
Ramon Torrecillas
  • Fonction : Auteur
J.S. Moya
  • Fonction : Auteur

Résumé

Isolated tungsten nanoparticles (a-W and ß-W phase) were synthesized and epitaxially grown on alumina and spinel particle surfaces with an average tungsten size of =20 nm for a low tungsten content (of =1.5 vol%). Using tungsten (VI) ethoxide alcoholic solutions, tungsten trioxide hydrated precursors were attached to a ceramic grains surface as a nanoparticle coating. High-resolution transmission electron microscopy (HRTEM) micrographs showed epitaxial interfaces between alumina, spinel and metallic tungsten. This epitaxial growth is assumed to be due to the effect of water vapour on the sublimation of ortho-tungstic acid during the reduction process in a hydrogen atmosphere. The planes involved in the epitaxy were found to be (220) Al2O3||(121)W and (311)MgAl2O4||(110) W.

Domaines

Matériaux
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Dates et versions

hal-00434022 , version 1 (20-11-2009)

Identifiants

  • HAL Id : hal-00434022 , version 1

Citer

Teresa Rodriguez Suarez, L.A. Diaz, S. Lopez-Esteban, Carlos Pecharroman, A, Esteban-Cubillo, et al.. Epitaxial growth of tungsten nanoparticles on alumina and spinel surfaces. Nanotechnology, 2008, pp.1. ⟨hal-00434022⟩
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