Highly Porous (TiO2−SiO2−TeO2)/Al2O3/TiO2 Composite Nanostructures on Glass with Enhanced Photocatalysis Fabricated by Anodization and Sol−Gel Process

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Abstract
Three-dimensional highly porous TiO2−4%SiO2−1%TeO2/Al2O3/TiO2 composite nanostructures (φ30−120 nm) directly fixed on glass substrates were fabricated by anodization of a superimposed Al/Ti layer sputter-deposited on glass and a sol−gel process. The porous composite nanostructures exhibited enhanced photocatalytic performances in decomposing acetaldehyde gas under UV illumination, which can be mainly ascribed to the combination of their large surface areas (7750−14770 m2/m2), high porosities (34.2−45.6%), and transparency. Specially, the composite nanostructure with ∼φ120 nm pores calcined at 500 °C showed the highest photocatalytic activity that is 6−10 times higher than commercial P-25 TiO2 under the experimental conditions.