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Highly ordered TiO2 nano-pillar arrays were deposited on the Ti foils by a hydrothermal method, using aqueous solutions of TiOSO4. The vertical nano-pillars with diameters in tens of nanometers strongly attached on the Ti foil and densely covered the whole surface. The structural studies clearly showed that the nano-pillars were pure tetragonal rutile TiO2 phase. [001] was the preferential growth...