Evaluation of Fluorine Ion Concentration in TiO2 NT Anodization Process
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abstract
Studies have shown that fluorine ions play a significant role in the initiation and growth of TiO 2 nanotubes. As fluorine is doped in titanium nanotubes (TiO 2 NTs), fluoride gases form during TiO 2 NT anodization. The concentration of fluorine in an electrolyte decreases as the anodization period increases. Maintaining a constant concentration of fluorine levels is a challenging task. In this paper, we discuss and calculate the quantity of fluorine reduced in an electrolyte given various electrolyte temperatures, sample sizes, and anodization time effects. According to thermodynamic calculations, F, FO, and FO 2 have relatively low vapor pressures but HF, H 2 F 2 , H 3 F 3 , H 4 F 4 , H 5 F 5 , H 6 F 6 , and H 7 F 7 have relatively high vapor pressures during anodization. The effects of fluorine contained in TiO 2 NT (12.2 wt %) and vaporized from the electrolyte can cause the fluorine concentration in the electrolyte to decrease. 2010 The Electrochemical Society.
