Using Prussian blue analogue nanoparticles confined into ordered mesoporous silica monoliths as precursors of oxides

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• 作者：Virgile Trannoy^a ; É ; milie Delahaye^a ; Giulia Fornasieri^a ; Patricia Beaunier^b ; Anne Bleuzen^a ; ^{anne.bleuzen@u-psud.fr" class="auth_mail}
• 关键词：Prussian blue analogues ; Co3O4 ; Nanoparticles ; Mesoporous silica
• 刊名：Comptes Rendus Chimie
• 出版年：June 2014
• 年：2014
• 卷：17
• 期：6
• 页码：512-520
• 全文大小：1980 K

文摘

Powdered Prussian blue analogues (PBAs) and PBAs confined in ordered mesoporous silica monoliths were used as oxide precursors through thermal treatment under an oxidizing atmosphere. The study focuses on the transformation of the alkali cation-free CoCo PBA of chemical formula K_0.1Co^II₄[Co^III(CN)₆]_2.7·20 H₂O. The compounds were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), IR spectroscopy and small-angle X-ray scattering (SAXS), and the magnetic properties of the calcined samples were investigated. In both cases, powdered and confined PBAs, the coordination polymers are transformed into well-crystallized Co₃O₄ spinel oxide. In the case of the confined PBA, isolated Co₃O₄ single crystals confined within the ordered mesoporosity of the monoliths were evidenced by HRTEM. A preliminary study shows an effect of particle size and confinement on the magnetic properties of the confined oxide particles.