Enhancement of optical absorption by modulation of the oxygen flow of TiO2 films deposited by reactive sputteringBandgap renormalization in titania modified nanostructured tungsten oxide thin films prepared by pulsed laser deposition technique for solar cell applications J. Appl. Phys.Thin titanium dioxide ͑TiO 2 ͒ films were deposited by pulsed KrF excimer laser ablation deposition system using a titanium oxide target. The effects of substrate temperature and oxygen partial pressure on the phase formations of various microstructures were investigated by x-ray diffraction ͑XRD͒, scanning electron microscopy ͑SEM͒, Raman scattering spectroscopy, and UV-Vis spectrophotometer. The film structures range from amorphous to mixed phase of anatase and rutile to pure anatase. Increasing the substrate temperature improves the quality of anatase phase of crystalline TiO 2 films. The oxygen pressure in the range between 15 and 60 mTorr shows a single anatase phase in TiO 2 films while the rutile and anatase mixed phases were observed elsewhere. The band gap of TiO 2 films varied from 2.72 to 3.27 eV with increasing oxygen partial pressure while the film structures changed from rutile phase to anatase phase. The surface area of TiO 2 films increased as oxygen partial pressure in film deposition. The photocatalytic performance evaluated by degradation of methylene blue in UV light was distinguishable in the TiO 2 films with high anatase phase and surface area.
This study used chitosan deacetylated to different degrees to process woolen fabrics via the nanometrization of sodium hydroxide of different concentrations. The analysis and determination of the bacterial resistance, shrink resistance, Fourier transform infrared, and dyeability were then carried out for the processed substances. The particle diameter was measured with light scattering and scanning electron microscopy. It was then reduced with 5% and higher concentrations of NaOH, in which the particle diameter was 150-750 nm. As for bacterial resistance, the processed cloth that was not oxidized by H 2 O 2 had better bactericidal and bacteriostatic effects than the cloth that underwent the oxidation process. Chitosan and meso-chitosan had a bacterial-resistance effect on the woolen fabrics. The processed cloth also had a better shrinkresistance rate, but the effect of nanometrization was not obvious. For the dyeability of the woolen fabrics, mesochitosan was better than chitosan. The higher degree of deacetylation of chitosan slightly improved the dyeability. The dyeability increased a little as the temperature of the curing treatment rose and the time of the curing treatment was extended.
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