Please use this identifier to cite or link to this item: https://doi.org/10.1039/c8sc02969e
Title: Polymorphism of nanocrystalline TiO2 prepared in a stagnation flame: Formation of the TiO2-II phase
Authors: Manuputty, M.Y.
Dreyer, J.A.H.
Sheng, Y.
Bringley, E.J.
Botero, M.L. 
Akroyd, J.
Kraft, M.
Issue Date: 2019
Publisher: Royal Society of Chemistry
Citation: Manuputty, M.Y., Dreyer, J.A.H., Sheng, Y., Bringley, E.J., Botero, M.L., Akroyd, J., Kraft, M. (2019). Polymorphism of nanocrystalline TiO2 prepared in a stagnation flame: Formation of the TiO2-II phase. Chemical Science 10 (5) : 1342-1350. ScholarBank@NUS Repository. https://doi.org/10.1039/c8sc02969e
Rights: Attribution-NonCommercial 4.0 International
Abstract: A metastable "high-pressure" phase known as ?-PbO2-type TiO2 or TiO2-II is prepared via a single-step synthesis using a laminar premixed stagnation flame. Three other TiO2 polymorphs, namely anatase, rutile and TiO2-B phases, can also be obtained by tuning the oxygen/fuel ratio. TiO2-II is observed as a mixture with rutile under oxygen-lean flame conditions. To the best of our knowledge, this is the first time that this phase has been identified in flame-synthesised TiO2. The formation of TiO2-II in an atmospheric pressure flame cannot be explained thermodynamically and is hypothesised to be kinetically driven through the oxidation and solid-state transformation of a sub-oxide TiO2-x intermediate. In this scenario, rutile is nucleated from the metastable TiO2-II phase instead of directly from a molten/amorphous state. Mixtures containing three-phase heterojunctions of anatase, rutile, and TiO2-II nanoparticles as prepared here in slightly oxygen-lean flames might be important in photocatalysis due to enhanced electron-hole separation. © The Royal Society of Chemistry 2019.
Source Title: Chemical Science
URI: https://scholarbank.nus.edu.sg/handle/10635/213750
ISSN: 20416520
DOI: 10.1039/c8sc02969e
Rights: Attribution-NonCommercial 4.0 International
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