Thursday, April 11, 2013

Rapid synthesis of TiO 2 nanoparticles by electrochemical anodization of a Ti wire

Ghafar Ali, Hyun Jin Kim, Jong Min Kum and Sung Oh Cho



We present a simple and novel strategy to synthesize TiO 2 nanoparticles (NPs) based on electrochemical anodization of a Ti wire in an aqueous KCl electrolyte. The Ti wire is very rapidly and directly converted to TiO 2 NPs by the anodization process, allowing mass production of TiO 2 NPs. The size of the synthesized NPs can be readily tuned by changing the concentration of the electrolyte. We found that the field-assisted etching related to a strong electric field and the rapid etching rate caused by chloride ions play important roles for the formation of TiO 2 NPs. This approach can also be applied to the mass production of other semiconducting metal oxide NPs such as tungsten-oxide NPs. TiO 2 NPs showed higher photocatalytic activity compared to Degussa (P 25) under the same conditions. The higher photocatalytic activity of TiO 2 NPs is attributed to the polymorphism. We believe that our approach can be used in broad ...



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