Abstract
Microarrays of N-doped flower-likeTiO2 composed of well-defined multilayer nanoflakes were synthesizedat room temperature by electrochemical anodization of Ti inNH4F aqueoussolution. The TiO2 flowers were of good anatase crystallinity. The effects of anodizing time, applied voltage andNH4F concentration on the flower-like morphology were systematically examined. It was foundthat the morphologies of the anodized Ti were related to the anodizing time andNH4F concentration. The sizeand density of the TiO2 flowers could be tuned by changing the applied voltage. The obtained N-doped flower-likeTiO2 microarrays exhibited intense absorption in wavelengths ranging from 320 to 800 nm. Underboth UV and visible light irradiation, the photocatalytic activity of the N-doped flower-likeTiO2 microarraysin the oxidation of methyl orange showed a significant increase compared with that of commercial P25TiO2 film.
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