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Oxygen mediated phase transformation in room temperature grown TiO2 thin films with enhanced photocatalytic activity
Banerjee D., Barman A., Deshmukh S., Saini C.P., Maity G., Pradhan S.K., Gupta M., Phase D.M., Roy S.S.,
Published in American Institute of Physics Inc.
Volume: 113
Issue: 8
Room temperature transformation from anatase (A-TiO2) to rutile (R-TiO2) thin films through an intermediate mixed phase on stainless steel driven by a controlled oxygen flow rate (OFR) is investigated. Such OFR dependent phase transition is confirmed by X-ray diffraction and also consistent with X-ray absorption spectroscopy at Ti L and O K-edges, showing a long range ordering in TiO6 octahedral symmetry. X-ray photoelectron spectroscopy reveals a gradual reduction in Ti2O3 and/or TiO intermediate phases with increasing OFR. Finally, an enhanced photocatalytic activity is observed in the mixed phase and discussed in terms of photo-generated charge transport in the type-II staggered band structure between A-TiO2 and R-TiO2 phases. © 2018 Author(s).
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Published in American Institute of Physics Inc.
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