Impact of Thickness of Columnar Crystal TiO_2 Film on Photocatalytic Activity of FTO/TiO_2 Coated Glass

Columnar crystal structured TiO2 thin films were prepared on the FTO(SnO2: F) low-emissivity coated glass substrates,obtaining double-layer structure FTO/TiO2 coated glass samples.The effect of TiO2 film thickness on the photocatalytic activity,the low-emissivity performance and light transmission properties of the FTO/TiO2 coated glass samples was investigated.The results showed that the photocatalytic activity of the samples increased firstly and then decrease with the increase of the film thickness.The best catalytic activity was observed for the sample coated with 300 nm TiO2 film.The low-emissivity properties of the samples declined as the TiO2film thickness increased.The sample still have some low-emissivity performance when the TiO2film thickness is 300 nm,while the light transmittance of the samples have little relations with the TiO2films thickness.The visible light transmittances of the samples remain at about 72% with a smooth surface.The average surface roughness of the sample is about 1 nm.The FTO/TiO2coated glass has photocatalytic self-cleaning properties with excellent low emissive performance and light transmittance property,thus guaranteeing good application prospects.