EFFECT OF DEPOSITION TIME OF ZNO NANORODS BY HYDROTHERMAL METHOD ON PHOTOCATALYSIS ACTIVITY

Zinc oxide Nanorods are grown by hydrothermal method on seed layer of ZnO for various deposition times at low temperature. The seed layers were deposited on soda lime glass by RF Sputtering with 100 nm of thickness. This study aimed to investigate the influence of deposition time of ZnO Nanorods on the photodegradation of Methylene Blue. It is well known that the experiment conditions control the growth of ZnO NRs. The crystalline structure of ZnO NRs was studied by means of X-ray diffraction and shows that the ZnO NRs obtained are primally well aligned and perpendicular to the substrate. Moreover, ZnO nanorods can be grown with a strong orientation along (101) and exhibit a wurtzite crystal structure in an XRD spectrum and possessed a high crystal quality. İn addition the strong relative intensity of the (002) lines reveals a texture effect of the arrays consistent with c-axis oriented nanorods. The Photocatalysis activity has more efficiency when the deposition times decrease

Influence of Seed Layer Surface Position on Morphology and Photocatalysis Efficiency of ZnO Nanorods and Nanoflowers

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

ANTIBACTERIAL ACTIVITY OF TiO2 THIN FILMS AGAINST GRAM NEGATIVE OF BACTERIAL STRAINS

Titanium dioxide (TiO2) is one of the most important semiconductors. It has attracted a growing attention in huge applications because of their unique properties. In this present survey we are interesting to investigate the resist growth of TiO2 thin films with various dopants against gram negative of Escherichia coli bacteria. TiO2 thin films were deposited on soda lime glass and tissue by two different methods (spray pyrolysis and sol-gel) in order to study their effect on antibacterial activity. We used two processes of bacteria and in the both the results indicate that TiO2 can resist the growth of E. coli. The zone of inhibition of this bacterium is found between 11 and 17 mm