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A Study on the Optimised Band Gap Tuning of Anodised TiO2 Nanotubes in Relation to Its Specific Tube Dimensions

We report the synthesis and characteristic analysis of well defined vertically oriented TiO2 nanotubes using potentiostatic anodisation method. This method allows precise design and control of the geometric features of the nanotube arrays, enabling a material to be moulded
 with specific light absorption and propagation properties. Hence, in this work we studied the effect of applied potential on the nanotube dimensions. While the effect of the applied potential on the nanotube dimensions were found by the change in tube length and diameter, the effective change
 in the light absorption properties were also observed corresponding to the change in band gap of the respective anodized sample. These outstanding observations were analyzed by using different characterization techniques such as Field Emission Scanning Electron Microscopy (FESEM), Ultra-Violet
 Diffuse Reflectance Spectroscopy (UV-DRS) and Field effective Photoconductivity confirming the optical tuning of band gap corresponding to significant change in the specific nanotube dimensions.