Tuning of Titanium Oxide Morphology at Micro and Nano Scale by Alternating Current Anodising
High surface area TiO2 layers are particularly attractive for photocatalytic applications; suitable anodising processes can be used to produce the oxides and to tune their morphology and structure. In the presented research, an alternative technique to enhance the surface area of anodic oxides was identified. This was achieved with the implementation of an anodising treatment performed by supplying alternating current in diluted hydrochloric acid (feeding voltage ranging from 5 V to 10 V). Alternating current anodising caused the formation of a double texture of pits on the oxide surface, the bigger ones being some micrometres wide and formed by smaller pits hundreds of nanometres large; these holes distribution and dimensions can be modulated by varying electrolyte concentration, feeding voltage and anodising time.
M. V. Diamanti et al., "Tuning of Titanium Oxide Morphology at Micro and Nano Scale by Alternating Current Anodising", Journal of Nano Research, Vol. 6, pp. 61-66, 2009