Abstract
TiO2 films of 50-180 nm thickness were formed at room temperature by anodization of titanium metal in a mixture of citric acid and sulfamic acid in the potential range of 5-30 V. The films so obtained were characterized for their crystal structure, surface morphology, chemical composition and optical properties. Grazing incidence x-ray diffraction and micro-laser Raman spectroscopy measurements of the anodic films confirmed the formation of brookite phase of TiO2 at anodizing potentials of 15, 20, 25 and 30 V and amorphous structure at 5 and 10 V. Field emission scanning electron microscopy revealed non-porous microstructure of the films. Spectroscopic ellipsometry measurements evaluated the band gap of TiO2 at around 3.3 eV, whereas the refractive index of the films was found to be in the range of 2-2.35, in the visible range of spectrum.
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Acknowledgment
The authors are grateful to Dr. A.K. Sahu, Glass & Advanced Materials Division, Bhabha Atomic Research Centre, Mumbai, for his assistance during FESEM analysis and Mr. V.B. Jayakrishnan, Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, for recording the GIXRD pattern.
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Choudhary, R.K., Sarkar, P., Biswas, A. et al. Structure, Morphology and Optical Properties of TiO2 Films Formed by Anodizing in a Mixed Solution of Citric Acid and Sulfamic Acid. J. of Materi Eng and Perform 26, 4001–4010 (2017). https://doi.org/10.1007/s11665-017-2818-0
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DOI: https://doi.org/10.1007/s11665-017-2818-0