Sankareswari, M. et al. 2017. Bandgap Tailored TiO2 Thin Films by Addition of SiO2 for Enhanced Photocatalytic Activity against Congo Red under Visible Light Illumination. Asian Journal of Chemistry. 29, 5 (Mar. 2017), 1085–1090. DOI:https://doi.org/10.14233/ajchem.2017.20413.