Abstract
The detailed micro-Raman study of pure TiO2 and Si-doped TiO2 thin film was synthesized by facile dip-coating technique for photocatalytic application, to degrade the organic species in polluted surface water due to the recent environmental crisis by dye industries. The prepared pure TiO2 and Si-doped TiO2 thin film were annealed at various temperatures 300 °C and 450 °C. Micro-Raman spectrum of TiO2 nanostructure confirms the presence of anatase phase. The crystallinity of TiO2 and uniformity of the film were improved in annealing temperature of 450 °C. The particle size of TiO2 was calculated on the basis of the phonon confinement model with the theoretical phonon dispersion relation. The phonon confinement effect depends upon the blue shift and broadening of the lower-frequency Eg Raman mode of TiO2. Also, the compressive stress of TiO2 was evaluated using a suitable formula. In addition, the dye degradation activity under visible light irradiation process using methylene blue (MB) was analyzed to check the ability of photocatalytic activity of prepared samples, in which, the fast MB degradation kinetics achieved by Si-TiO2 nanocrystal and it degrades 99% of MB within 60 min. Also, it exhibits more than 90% photodegradation efficiency up to ten recycle than pristine. Moreover, the possible photocatalytic mechanism of the prepared system was discussed.
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The author (VR) and (CS) are thankful to UGC, Government of India for providing micro Raman facility under UPE program and (PS) is thankful to UGC for the award of research fellowship under UPE program. The author, S. Jayapandi, acknowledges UGC for providing Non-NET fellowship.
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Sangeetha, P., Jayapandi, S., Saranya, C. et al. Phonon confinement and size effect in Raman spectra of TiO2 nanocrystal towards Photocatalysis Application. J Aust Ceram Soc 57, 533–541 (2021). https://doi.org/10.1007/s41779-020-00555-0
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DOI: https://doi.org/10.1007/s41779-020-00555-0