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    Kinetics of TSCD zinc oxide nano-layer growth by modified diffuse-interface model

    , Article Ceramics International ; Volume 33, Issue 8 , December , 2007 , Pages 1409-1417 ; 02728842 (ISSN) Sadrnezhaad, S. K ; Vaezi, M. R ; Sharif University of Technology
    2007
    Abstract
    Deposition of zinc oxide films from aqueous solutions containing complex Zn2+ ions on soda-lime substrates were studied by two-stage chemical deposition (TSCD) process. It was shown that the film thickness can be controlled by the number of dipping stages. Nano-layers were produced with less than nine times dipping stages. Greater dipping numbers resulted in film thickness exceeding 100 nm. The growth rate obeyed double-stage zeroth order with respect to the concentration and first order with respect to the temperature. This rate was proportional to the difference between the temperature of the hot water and the substrate. Overall activation energy of 17.20 ± 0.42 kJ mol-1 and frequency... 

    The role of TiO2 addition in ZnO nanocrystalline thin films: Variation of photoelectrochemical responsivity

    , Article Electrochimica Acta ; Volume 56, Issue 18 , July , 2011 , Pages 6284-6292 ; 00134686 (ISSN) Naseri, N ; Yousefi, M ; Moshfegh, A. Z ; Sharif University of Technology
    2011
    Abstract
    In this study, the effects of TiO2 addition on the physical and photoelectrochemical properties of ZnO thin films have been investigated. The (TiO2)x-(ZnO)1-x nanocomposite thin films were dip-coated on both glass and indium tin oxide (ITO)-coated conducting glass substrates with various values of x, specifically 0, 0.05, 0.1, 0.25 and 0.5. Optical properties of the samples were studied by UV-vis spectrophotometry in the range of 300-1100 nm. The optical spectra of the nanocomposite thin films showed high transparency in the visible region. The optical bandgap energy of the (TiO2)x-(ZnO)1-x films increased slightly with increasing values of x. The crystalline structure of the nanocomposite...