The crystalline phase, phase transformation, optical properties, photoluminescence and photoconductivity of pure and doped Titania (TiO2) nanomaterials have been presented here. The main focus is to investigate phase transformation, phase existence on doping, photoluminescence and photoconductivity of TiO2 nanoparticles. The three polymorphs (anatase, rutile and brookite) associated with titanium dioxide (TiO2), anatase TiO2 is widely regarded as the most effective photocatalyst. In this book TiO2 nanoparticles were synthesized by sol-gel and co-precipitate methods. These TiO2 nanoparticles...