Fig. 7From: Biosynthesis, characterization and optimization of TiO2 nanoparticles by novel marine halophilic Halomonas sp. RAM2: application of natural dye-sensitized solar cellsUV–Vis absorption A and the corresponding Tauc plots B of Halomonas sp. RAM2 TiO2 NPs calcined at 500, 600, 700 and 800 °C. An Indirect band gap was obtained for TiO2 NPs calcined at 500, 600 and 700 °C, while a direct band gap was obtained for TiO2 NPs calcined at 800 °CBack to article page