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Synthesis of Titanium Dioxide Nanoparticles with Desired Ratio of Anatase and Rutile Phases and the Effect of High Temperature Annealing

The Titanium Dioxide nanoparticles (TiO2 NPs) with desired ratio of anatase and rutile have been prepared by convenient and operable green method using Peltophorum pterocarpum (PP) flower extract. The prepared TiO2 NPs have been characterized by X-Ray diffractometer (XRD), Transmission Electron Microscope (TEM) and Raman spectroscopy. The XRD exhibits that the prepared TiO2 NPs were crystalline with various percentage of anatase and rutile phases. The TEM images show that the prepared nanoparticles are nanometre in scale. The influences of annealing temperature on structural properties have been investigated for 100% anatase TiO2. A clear evidence of structural transformation from pure anatase to anatase–rutile mixed phase structures has been confirmed by XRD. In this study, it was found that, the TiO2 NPs can be prepare with desired ratio of anatase and rutile with high uniformity, high surface area and minimum aggregation by controlling the experimental conditions such as dosage of flower extract. It exhibit excellent antibacterial activity against Escherichia coli and concludes that the higher amount of anatase shows higher activity.