Long-range and short-range structures of cube-like shape SrTiO3 powders: microwave-assisted hydrothermal synthesis and photocatalytic activity
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Otros documentos de la autoría: Da Silva, Luis F.; Avansi, Waldir; Andres, Juan; Ribeiro, Caue; Moreira, Mario Lucio; Longo, Elson; Mastelaro, Valmor Roberto
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http://dx.doi.org/10.1039/C3CP50643F |
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Título
Long-range and short-range structures of cube-like shape SrTiO3 powders: microwave-assisted hydrothermal synthesis and photocatalytic activityAutoría
Fecha de publicación
2013Editor
Royal Society of ChemistryISSN
1463-9076; 1463-9084Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://pubs.rsc.org/en/content/articlepdf/2013/cp/c3cp50643fVersión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
We report herein a detailed study on the influence of microwave-assisted hydrothermal (MAH) treatment time on both long and short range structures around Ti atoms of SrTiO3 powders. Few studies have been carried out ... [+]
We report herein a detailed study on the influence of microwave-assisted hydrothermal (MAH) treatment time on both long and short range structures around Ti atoms of SrTiO3 powders. Few studies have been carried out on short-order structural properties as well as the relationship between the local order and the SrTiO3 photocatalytic properties. We use X-ray diffraction to determine the long-range structure, while the local environment around the Ti atom is probed with X-ray absorption spectroscopy and the vibration frequencies are investigated by Raman spectroscopy. The faster crystallization of SrTiO3 powders provided by the MAH system resulted in large distortions of Ti–O bond lengths which remain unchanged even for a longer MAH treatment time. Despite the long-range structure being associated with ideal TiO6 clusters, X-ray absorption spectroscopy measurements identified the presence of undercoordinated TiO5 clusters. Compared with the reference bulk SrTiO3, the hierarchical SrTiO3 cube-like shape showed enhanced photocatalytic activity, which was associated with the presence of these TiO5 clusters. Field emission scanning electron microscopy (FE-SEM) revealed that the superstructures based on a cube-like shape are formed by an assembly process, becoming well defined as a function of MAH treatment time. [-]
Publicado en
Phys. Chem. Chem. Phys., 2013, Volume 15, Issue 29Derechos de acceso
This journal is © the Owner Societies 2013
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