Precision Bandgap Control of Titanium Dioxide Nanoparticles by Ultrasonication

TiO2 is a commonly used material in many areas of industry including photocatalysis and pigments. Band gap narrowing and particle size are engineered with a high level of control. We report precision bandgap control by ultrasonication in novel stable solvent systems in which unmodified TiO2 can be suspended. The effects of ultrasonication in these unique solvent systems are monitored by optical band gap (UV-Vis), scanning electron microscopy (SEM), atomic force microscopy (AFM), and x-ray diffraction (XRD).