An effort was made not only to demonstrate the performance of the self-cleaning coatings on building
materials such as ceramic glazed tiles and glass windows, but also to understand the fundamental issues
that are still alive in the field of self-cleaning surfaces based on photocatalysis. Nano TiO2 transparent
thin films were generated by dip, spray and flow coating method. The present results indicate that the
inconsistent results in the self-cleaning studies may be due to the effect of aggregation of model pollutant
(methylene blue) dye on TiO2 surface. The effect of aliovalent metal ion (Ni2+, Fe3+, Nb5+) doping on
phase formation, polymorphic transition, visible light absorbance and optical transparency of TiO2 film
were investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV visible
absorption spectroscopy. The improved visible light activity of doped TiO2 thin film was correlated to the
Ti(Ni/Fe)O3 phase formation, UV and visible light absorbance, variation in the optical energy band gap
and the probable light scattering associated with grain size.
©
An effort was made not only to demonstrate the performance of the self-cleaning coatings on building
materials such as ceramic glazed tiles and glass windows, but also to understand the fundamental issues
that are still alive in the field of self-cleaning surfaces based on photocatalysis. Nano TiO2 transparent
thin films were generated by dip, spray and flow coating method. The present results indicate that the
inconsistent results in the self-cleaning studies may be due to the effect of aggregation of model pollutant
(methylene blue) dye on TiO2 surface. The effect of aliovalent metal ion (Ni2+, Fe3+, Nb5+) doping on
phase formation, polymorphic transition, visible light absorbance and optical transparency of TiO2 film
were investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV visible
absorption spectroscopy. The improved visible light activity of doped TiO2 thin film was correlated to the
Ti(Ni/Fe)O3 phase formation, UV and visible light absorbance, variation in the optical energy band gap
and the probable light scattering associated with grain size.
©
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