Abstract: Titanium film was deposited on fluorinedoped tin oxidecoated glass substrate (FTO) by electron beam evaporation (EBEAM), ultralong titania nanotube arrays/FTO electrode was fabricated by potentiostatic anodization of the titanium film in C₂H₆O₂+NH4F electrolyte at room temperature. The structure and the composition of the titania nanotube arrays/FTO electrode were characterized by field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), X-ray photoelectron spectroscope (XPS), X-ray diffraction (XRD) and transmission spectrometer. The results show that inner diameter and length of the asprepared titania nanotube are 43nm and 5.4μm respectively. The titania nanotube arrays/FTO transparent electrode after annealing in air is of anatase phase with length of 5μm. The transmittance of the titania nanotube arrays is 45% in visible wavelength range and an absorbance peak is observed at wavelength of 400nm.

Key words: TiO₂ nanotube arrays/FTO electrode, anodization, transparency