TiO_2 a nanotube array was prepared using an anodization process. The process proceeded in a two-electrode cell containing of platinum sheet as the cathode electrode. Two phosphate-base electrolyte solutions containing different amounts of HF and NH_4F were prepared. Different concentration of fluorine ions were examined in respected electrolytes. Current transient techniques were used to produce the TiO_2 nanotubes at constant voltage of 18- 25V. It was revealed that anodization at 18- 22V, in so-called electrolytes would end up to nano-tubular structure. However the tubular structure prepared at 20V and from phosphate electrolyte containing of 0.5 wt% NH4F as well as 0.5 wt% HF, was recognized the best. The results were also confirmed by Scanning Electron Microscopy (SEM) images. Phase characterization of the nanotube oxide layer was carried out using x-ray diffraction (XRD) method.
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