Atomic-Scale Investigation on the Evolution of Tio2-Anatase Prepared by a Sonochemical Route and Treated with NaOH

To date, the formation mechanisms of TiO2, as well as its heterostructures, have not been clarified. Moreover, detailed research on the transition from a tetragonal anatase phase to the monoclinic phase of the TiO2(B) phase and their interface structure has been quite limited until now. In the prese...

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Published in:Materials 2020-02, Vol.13 (3), p.685
Main Authors: Victoria Dimas, Berenice, Hernández Pérez, Isaías, Garibay Febles, Vicente Garibay, Díaz Barriga Arceo, Lucía Díaz Barriga, Suárez Parra, Raúl Suárez, Rivera Olvera, Jesús Noé, Luna Paz, Ricardo, Melo Máximo, Dulce Viridiana Melo, González Reyes, Leonardo González
Format: Article
Language:English
Subjects:
Anatase
Crystallites
Grain boundaries
Heterostructures
Microscopy
Morphology
Nanofibers
Nanoparticles
Ostwald ripening
Reaction time
Self-assembly
Temperature effects
Titanium dioxide
Ultrasonic imaging
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Summary:To date, the formation mechanisms of TiO2, as well as its heterostructures, have not been clarified. Moreover, detailed research on the transition from a tetragonal anatase phase to the monoclinic phase of the TiO2(B) phase and their interface structure has been quite limited until now. In the present study, we report on the sonochemical synthesis of TiO2-anatase with a crystallite size of 5.2 ± 1.5 nm under different NaOH concentrations via the hydrothermal method. The use of alkaline solution and the effect of the temperature and reaction time on the formation and structural properties of TiO2-anatase nanopowders were studied. The effects of NaOH concentration on the formation and transformation of titanate structures are subject to thermal effects that stem from the redistribution of energy in the system. These mechanisms could be attributed to three phenomena: (1) the self-assembly of nanofibers and nanosheets, (2) the Ostwald ripening process, and (3) the self-development of hollow TiO2 mesostructures.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma13030685