| TiO2 nanomaterials have been widely studied due to their unique electrical and electrochemical properties which are suitable for sensing, catalysis and solar cells. In recent years, TiO2 nanotubes with high surface-to-volume ratios have received considerable attention because of their potential applications of highly efficient photocatalysis and photovoltaic cells. If the TiO2 nanotube films could be transferd onto the FTO substrates, the transparent and conductive porous TiO2/FTO films would have a better application in the photoelectric conversion filed. This dissertation titled"Investigation of the controllable growth of highly ordered porous TiO2/FTO nanoarray membranes"mainly describes the following work and results:1. The effect of target-to-substrate distance on the uniformity of films prepared by PLD was investigated, taking the TiO2 films fabricated on glass substrate by pulse laser deposition system (PLD-â…¢) as an example. The results indicate that, the high rate deposition areas gradually develope from an axisymmtric cirlular ring to a round spot (2.20 cm in diameter) located in the center of substrate by adjusting the target-to-substrate distance within certain range (3.00-7.00 cm). Furthermore, the mechanism was analized according to the principle of PLD and geometrical relationship between target and substrate.2. High quality ordered TiO2 nanotubes were successfully fabricated by anodic oxidation of Ti substrates assisted by ultrasonic cleaning.3. High quality ordered porous TiO2 nanoarray membranes were successfully fabricated by anodic oxidation of Ti films deposited on transparent fluorine-doped tin oxide-coating (FTO) glass substrate with pulsed laser deposition (PLD) technique. The mechanism of controllable growth of ordered porous TiO2 nanoarrays was investigated. Therefore, the ordered porous TiO2 membranes with thin compact titanium on FTO substrate can be prepared, which is beneficial to form organic-inorganic heterojunctions for photovoltaic applications.
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