Thermal stability of (KxNayH1-x-y)2Ti6013 nanofibers

Article


Cortie, Michael B., Xiao, Linda, Erdei, Laszlo, Kealley, Catherine S., Dowd, Annette R., Kimpton, Justin A. and McDonagh, Andrew M.. 2011. "Thermal stability of (KxNayH1-x-y)2Ti6013 nanofibers." European Journal of Inorganic Chemistry. https://doi.org/10.1002/ejic.201100651
Article Title

Thermal stability of (KxNayH1-x-y)2Ti6013 nanofibers

ERA Journal ID1523
Article CategoryArticle
AuthorsCortie, Michael B. (Author), Xiao, Linda (Author), Erdei, Laszlo (Author), Kealley, Catherine S. (Author), Dowd, Annette R. (Author), Kimpton, Justin A. (Author) and McDonagh, Andrew M. (Author)
Journal TitleEuropean Journal of Inorganic Chemistry
Number of Pages9
Year2011
Place of PublicationGermany
ISSN1099-0682
1434-1948
Digital Object Identifier (DOI)https://doi.org/10.1002/ejic.201100651
Web Address (URL)https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/ejic.201100651
Abstract

Potassium-rich titanate nanofibers were produced by digesting TiO2 in concentrated KOH solutions under hydrothermal conditions. The nanofibers were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and thermogravimetric analysis. A hexa-titanate structure was assigned, in contrast to the tri-titanate structure usually resulting from NaOH treatment of TiO2. The potassium cations could be exchanged with others, such as sodium, hydrogen and ammonium. The potassium-rich hexa-titanate was found to be photocatalytic in the as-synthesized condition.

The thermal stability of the fibers during calcination was followed in situ using X-ray diffraction and was found to be strongly dependent on the chemical composition. The potassium-rich titanate converted to anatase at only 480 °C while the hydrogen-rich and ammonium-rich materials had to be heated to over 600 °C before conversion took place. Conversion was notably slowest in the ammonium-rich material. Surprisingly, the sodium-rich hexa-titanate did not form anatase at temperatures up to 800 °C, and instead recrystallized.

Keywordsnanostructures; nanofibres; layered compounds; high-temperature chemistry; titanates; solid-state reactions
ANZSRC Field of Research 2020340210. Solid state chemistry
401807. Nanomaterials
401805. Nanofabrication, growth and self assembly
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Byline AffiliationsUniversity of Technology Sydney
Department of Agricultural, Civil and Environmental Engineering
Australian Synchrotron, Australia
Institution of OriginUniversity of Southern Queensland
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