Abstract
Ideally ordered anodic porous TiO2 was fabricated through the pretexturing of Ti by nanoimprinting using a metal mold with an ordered array of convexes. The shallow concaves prepared by nanoimprinting acted as initiation sites for hole development during the subsequent anodization and generated ideally hexagonally ordered porous or nanotubular TiO2. The hole interval of the ideally ordered TiO2 could be controlled by changing the pretexturing pattern. This process is a key step towards the preparation of various types of functional devices requiring ideally ordered defect-free hole or pore arrangements.
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•The formation of ideally ordered TiO2 could be achieved.•The ordered concaves were formed on the surface of Ti by the nanoimprinting process.•Each concave acts as an initiation site for hole development during the anodization.