ZnO nanorods and nanoflowers were synthesized by a hydrothermal method via different surface substrate positions at 120°C for 3 h as a growth time. The influence of seed layer surface position on the growth of ZnO nanostructures was observed by the variation of ZnO morphologies from nanorods to nanoflowers. Both analyses XRD and EDS proved the pure wurtzite phase with high crystallinity quality and preferential growth along the c-axis. As displayed from the scanning of surface morphology through SEM, a large amount of ZnO nanorods and nanoflowers were deposited on the full substrate surface. Diverse ZnO photocatalysts were used to study the photodegradation of Methylene Blue (MB) dye by UV light. The organic dye MB was decolorized by the most efficient photocatalyst among the ZnO-tested nanostructures. The results showed an improvement of the degradability of this dye from 54% to 81% for ZnO nanoflowers compared to nanorods. Thus, ZnO nanoflowers are the best photocatalyst which have the high efficiency photodegradation and the large rate constant.
Nanoscale materials and their unique properties make them attractive for research and health -related applications. Silver nanoparticles were synthesised and incorporated in zinc oxide (ZnO) thin films on glass and tissue, in order to study their effect on antibacterial activity. ZnO films with various contents of Ag nanoparticles were prepared by the sol –gel method. Xray diffraction revealed the polycrystalline structure of the films, scanning electron microscopy exhibited their dense and continuous structure and UV-visible spectroscopy for measurement and transmittance was at more than 87%. The absorbance peak of Ag NPS was centred at 351 nm. The diameter of Ag NPS was analysed by Zeta Sizer and the colloids ranged from 2 to 110 nm. The results indicate that ZnO with Ag NPs on tissue can resist the growth of this kind of bacteria, with the zone of inhibition of the bacteria ATTC 700603 at between 8 and 18 mm .Keywords: Ag nanoparticles, zinc oxide, tissue, antibacterial activity.
Titanium oxide (TiO2) is one of the most important semiconductors because of their properties. This study was carried out to investigate the influence of the number of layers of Co -doped TiO2 thin films obtained by sol–gel method on the photocatalytic activity. The crystalline structure of films is characterised by means of X-ray diffraction and Raman spectroscopy. All the films were of anatase phase and the particle size was in nanoscale. The surface morphology was studied by atomic force microscopy. The optical properties were investigated by UV-visible spectroscopy. The photocatalytic properties of the samples were tested on the degradation of methylene blue dye solution. The results indicated that photocatalysis is more important when the number of dipping of films increases.Keywords: Photocatalysis, X-ray diffraction, TiO2, thin films, methylene blue.
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