Title: Evaluation of OH Radical Generation to Nanotube Morphology of TiO<sub>2</sub> Nanotube Plate
Abstract: In this study, a TiO<sub>2</sub> nanotube was grown on a titanium plate by using anodic oxidation method for the evaluation of TiO<sub>2</sub> nanotube morphology. The TiO<sub>2</sub> nanotube was grown in an electrolyte containing ethylene glycol, 0.2 wt% of NH<sub>4</sub>F and 2 vol% of H<sub>2</sub>O. Applied voltage varied from 30 to 70 V and the morphology of the TiO<sub>2</sub> nanotube was observed. After anodization, a TiO<sub>2</sub> nanotube plate was immersed in 35℃ ethanol for 24 hours. Anatase and rutile crystal forms of TiO<sub>2</sub> nanoutbe were observed after annealing. 4-chrolobenzoic acid, a probe compound for OH radicals, was dissolved in H<sub>2</sub>O in order to measure the OH radical. Liquid chromatography was used to check the concentration of the 4-chrolobenzoic acid. The OH radical generation by TiO<sub>2</sub> nanotube plate was proportionate to the length of the TiO<sub>2</sub> nanotube. Furthermore, when the number of TiO<sub>2</sub> nanotube plate increased, the OH radical generation increased as well.