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Highly photoactive 2D titanium dioxide nanostructures prepared from lyophilized aqueous colloids of peroxo-polytitanic acid
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SYSNO ASEP 0429129 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Highly photoactive 2D titanium dioxide nanostructures prepared from lyophilized aqueous colloids of peroxo-polytitanic acid Author(s) Šubrt, Jan (UACH-T) SAI, RID
Pulišová, Petra (UACH-T) RID, SAI
Boháček, Jaroslav (UACH-T) SAI
Bezdička, Petr (UACH-T) SAI, RID, ORCID
Pližingrová, Eva (UACH-T) SAI, ORCID
Volfová, Lenka (UACH-T) SAI, RID
Kupčík, Jaroslav (UACH-T) SAI, RID, ORCIDSource Title Materials Research Bulletin. - : Elsevier - ISSN 0025-5408
Roč. 49, JAN (2014), s. 405-412Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords Oxides ; Layered compounds ; Electron microscopy ; Raman spectroscopy ; X-ray diffraction Subject RIV CA - Inorganic Chemistry R&D Projects GA203/09/1117 GA ČR - Czech Science Foundation (CSF) Institutional support UACH-T - RVO:61388980 UT WOS 000330081400063 EID SCOPUS 84886079700 DOI 10.1016/j.materresbull.2013.09.028 Annotation Reaction of hydrogen peroxide with suspensions of thoroughly washed precipitates obtained by neutralization of aqueous solution of titanyl sulfate with aqueous ammonia leads to transparent yellow liquids. In this way prepared colloid solution is a two phase system in which, beyond the water phase, also a liquid hydrated peroxo-polytitanic acid component is present. Freeze drying of this colloid liquid provides a foamy material consisting of thin foils of peroxo-polytitanic acid containing small but not negligible amount of chemically bound ammonia. These foams annealed at temperature above similar to 200 degrees C lose water, ammonia and excess of oxygen providing foamy amorphous oxide. At higher temperatures above similar to 280 degrees C the amorphous material crystallizes to anatase which transforms at temperatures >850 degrees C to rutile. The size and shape of the initial leaflets forming the foam is preserved up to similar to 900 degrees C. Slit shaped porosity is formed during annealing. We observed that the annealed material is highly photoactive, probably owing to highly anisotropic shape of anatase aggregates and their perfect crystallinity. Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2015
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