Preparation Of Titania Nanotube Arrays And The Formation Mechanism

Because of the special structure of TiO2 nanotube, it has more surface area and stronger adsorptive capacity than other nanotubes, thus, TiO2 nanotubes displays the higher photochemical catalysis performance and the electro-optic transfer efficiency. TiO2 nanotubes demonstrated huge potential applications and had already applied in the photocatalyst, the solar cell, gas sensing material, catalyst carrier and super capacitor.In this paper we used anodic oxidation method, in the electroanalysis solution, and got a about 50～70nm in diameter,500～600nm in tube length, neat and orderly structure of high-density TiC>2 nanotube arrays on the surface of the titanium.Through testing the influence of the operating voltage, electrolyte solution, the nature of the buffer on the morphology of TiO2 nanotube array, aslo analyzing the SEM morphology of nanotube arrays, I-t curve, color and time analysis, we studied the mechanism of the formation of TiO2 nanotubes prepared by anodic oxidation. the Studies suggested that, TiO2 nanotube arrays's formation was mainly through the formation of a dense membrane, pore appears, nanotubes integration and stable growth of the tube length,4 stages. First, a dense titanium oxide film was formed rapidly on the surface of the titanium. Aslo oxide film dissolved at the same time, the formation rate was faster than the dissolution rate, the electrode/solution electrical double-layer structure (tight layer/ decentralized layer) made the oxide film on the surface into holes. Then the small holes increasing integrated the adjacent holes and became bigger holes, followed by the formation of small tubes and further into the larger tubes. After the diameter of the tubes became to the maximum, the nanotube length would continue increase. And the nanotubes came into the stable growth stage. Neat, orderly, and high-density nanotube array was final formed.