Controlled growth of silica shell on Ba0.6Sr0.4TiO3 nanoparticles used as precursors of ferroelectric composites - Archive ouverte HAL
Article Dans Une Revue Chemistry of Materials Année : 2005

Controlled growth of silica shell on Ba0.6Sr0.4TiO3 nanoparticles used as precursors of ferroelectric composites

Résumé

A method based on a seeded growth process was developed to coat ferroelectric nanoparticles with a dielectric silica shell. This method, applied to size-polydispersed (Ba0.6Sr0.4)TiO3 particles (BST, mean diameter 150 nm), allows the control of the silica shell thickness from 2 to 80 nm with an accuracy of 1-2 nm. The morphology and surface physical chemistry of the core-shell were studied by transmission electron microscopy, photon correlation spectroscopy, and zeta potential measurements. A size-sorting procedure consisting of several cycles of centrifugation was optimized to extract the BST@silica nanoparticles of the required size for dielectric properties tuning. Upon sintering, dielectric measurements showed that the ferroelectric transition was maintained in the dense nanocomposites.

Domaines

Matériaux

Dates et versions

hal-00095754 , version 1 (18-09-2006)

Identifiants

Citer

Stéphane Mornet, Catherine Elissalde, Virginie Hornebecq, Olivier Bidault, Etienne Duguet, et al.. Controlled growth of silica shell on Ba0.6Sr0.4TiO3 nanoparticles used as precursors of ferroelectric composites. Chemistry of Materials, 2005, vol. 17, n° 17, p. 4530-4536. ⟨10.1021/cm050884r⟩. ⟨hal-00095754⟩
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