MORNET, Stéphane; ELISSALDE, Catherine; HORNEBECQ, Virginie; BIDAULT, Olivier; DUGUET, Etienne; BRISSON, Alain; MAGLIONE, Mario

doi:10.1021/cm050884r

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MORNET, Stéphane
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

ELISSALDE, Catherine
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

HORNEBECQ, Virginie
Matériaux divisés, interfaces, réactivité, électrochimie [MADIREL]

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Chemistry of Materials. 2005, vol. vol. 17, n° 17, p. p. 4530-4536

American Chemical Society

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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.< Leer menos

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Nanoparticles

Silica

Ferroelectrics

Composites

Core-shell

Growth

Ba0.6Sr0.4TiO3

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

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