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Abstract: In this study, TiO2−x N x /TiO2 double layers thin film was deposited on ZnO (80nm thickness)/soda–lime glass substrate by a dc reactive magnetron sputtering. The TiO2 film was deposited under different total gas pressures of 1Pa, 2Pa, and 4Pa with constant oxygen flow rate of 0.8sccm. Then, the deposition was continued with various nitrogen flow rates of 0.4, 0.8, and 1.2sccm in constant total gas pressure of 4Pa. Post annealing was performed on as-deposited films at various annealing temperatures of 400, 500, and 600°C in air atmosphere to achieve films crystallinity. The structure and morphology of deposited films were evaluated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and atomic force microscopy (AFM). The chemical composition of top layer doped by nitrogen was evaluated by X-ray photoelectron spectroscopy (XPS). Photocatalytic activity of samples was measured by degradation of Methylene Blue (MB) dye. The optical transmittance of the multilayer film was also measured using ultraviolet–visible light (UV–vis) spectrophotometer. The results showed that by nitrogen doping of a fraction (∼1/5) of TiO2 film thickness, the optical transmittance of TiO2−x N x /TiO2 film was compared with TiO2 thin film. Deposited films showed also good photocatalytic and hydrophilicity activity at visible light. [Copyright &y& Elsevier]

Abstract: Titanium oxide thin films were deposited by DC reactive magnetron sputtering on ZnO (80 nm thickness)/soda-lime glass and SiO2 substrates at different gas pressures. The post annealing on the deposited films was performed at 400 °C in air atmosphere. The results of X-ray diffraction (XRD) showed that the films had anatase phase after annealing at 400 °C. The structure and morphology of deposited layers were evaluated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The surface grain size and roughness of TiO2 thin films after annealing were around 10–15 nm and 2–8 nm, respectively. The optical transmittance of the films was measured using ultraviolet–visible light (UV–vis) spectrophotometer and photocatalytic activities of the samples were evaluated by the degradation of Methylene Blue (MB) dye. Using ZnO thin film as buffer layer, the photocatalytic properties of TiO2 films were improved. [ABSTRACT FROM AUTHOR]