Effect of substrate type, dopant and thermal treatment on physicochemical properties of TiO2�?�SnO2 sol�?�gel films

[摘要] Thin nanocrystalline TiO₂â€�?�SnO₂ films (0â€�??50 mol% SnO₂) were prepared on quartz and stainless steel substrates by solâ€�?�gel coating method. The obtained films were investigated by XRD, Raman spectroscopy and XPS. The size of the nanocrystallites was determined by XRDâ€�?�LB measurements. We ascertained that the increase of treatment temperature and concentration of SnO₂ in the films favour the crystallization of rutile phase. The substrate type influences more substantially the phase composition of the TiO₂â€�?�SnO₂ films. It was established that a penetration of elements took place fromthe substrate into the films. TiO₂ films deposited on quartz substrate include a Si which stabilizes anatase phase up to 600 °C. The films which are deposited on stainless steel substrate and treated at 700 °C show the presence of significant quantity of rutile phase. This phenomenon could be explained by the combined effect of Sn dopant as well as Fe and Cr, which also are penetrated in the films from the steel substrate. The titania films doped up to 10 mol% SnO₂ on stainless steel possess only 12â€�??17 nm anatase crystallites, whereas the TiO₂â€�??(10â€�??50 mol%) SnO₂ films contain very fine grain rutile phase (4 nm).

[学科分类] 材料工程

[关键词] TiO2â€�?�SnO2 films;solâ€�?�gel;anatase;rutile;quartz substrate;stainless steel substrate.