$$\hbox {SiO}_{2}\hbox {/TiO}_{2}$$ SiO 2 /TiO 2 multi-layered thin films with self-cleanin

Abstract

Self-cleaning, high transmittance glazing was obtained by cold spray deposition for glazings. The thin films contain TiO 2 , SiO 2 and Au nanoparticles in different structures which allow for tailoring the optical, hydrophilic and photocatalytic properties. The crystallinity, morphology and surface energy were correlated with the optical transmittance and reflectance; the transmittance increased from 89.45 (for the glass substrate) to 91.76% when Au nanoparticles were used in the tandem layered structures. The samples containing alternating multi-layered SiO 2 and TiO 2 thin films without gold nanoparticles show hydrophilic surface; for these layers, the photocatalytic efficiency reaches 40% under simulated solar radiation. A conditioning effect based on adsorption was observed to increase the photocatalytic efficiency. These highly transparent coatings are well suited for glazings and fenestration, showing the self-cleaning effect based on combined superhydrophilicity and photocatalysis.

Sol-Gel Spin Coated Transparent Single-TiO2 and SiO2 Thin Film on Glass for Opto-electronic Applications

“…The smooth surface morphological images depict a single layer of SiO2 and TiO2 thin film. A single layer of SiO2 and TiO2 thin film composes the surface morphological images appear to be smooth, however, some of the amorphous nature particles appeared on the sample surfaces were due to the calcinations process [32][33][34][35][36][37][38].…”