Firmness and bandgap engineered anatase TiO2 nanoparticles for enhanced visible light photocatalytic activity

Titanium dioxide is a standard semiconductor material plays a vital role in environmental and energy research. Anatase to rutile phase transformation in pure TiO2 nanoparticles usually occurs in the temperature range 600 degrees C-700 degrees C with it only absorbs UV light, owing to its large bandgap of 3.2 eV. Till date, researchers and industrialists have been trying to synthesize TiO2 nanoparticles with increased anatase phase stability with reducing the bandgap of pure anatase phase to the visible region, used dopant or H2O2 precursor modification, but the long time has taken photocatalytic activity under sunlight. Here, using a novel Photon Induce Method (PIM) has reported extending the anatase to a rutile transformation temperature, which in turn reflects on the stability of the material. PIM prepared oxygen-rich TiO2 nanoparticles exhibit enhanced temperature stable anatase phase, i.e. the sample remained as pure anatase phase even after calcinating at 1000 degrees C with a reduced bandgap of less than 2.91 eV, stretching towards the red region of the sunlight, whereas the standard Degussa P25-TiO2 and Others are reported to exist as 100% rutile at this temperature. By tuning the oxygen vacancy preparation conditions, we can reversibly improve oxygen-rich Titania via PIM. The absence of dopant or H2O2 of pure Titania anatase nanoparticles is high chemical reactivity has important implications for antibacterial, cancer cells kill, photocatalysis and solar energy conversion.