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Author: search.filters.author.Noonuruk, R.Subject: search.filters.subject.Nickel oxide

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    Characterization and ozone-induced coloration of Zn xNi 1 - XO thin films prepared by sol-gel method
    (2012-01-31)
    Noonuruk, R.
    ;
    Techitdheera, W.
    ;
    Pecharapa, W.
    Zn <inf>x</inf>Ni <inf>1 - x</inf>O thin films were prepared by sol-gel spin coating method onto glass substrates in combination with annealing process. Effect of zinc content on the structural, optical and ozone-induced coloration properties of as-prepared films was investigated by X-ray diffraction, field emission-scanning electron microscope, atomic force microscopy and UV-VIS spectrophotometer, respectively. X-ray diffraction results reveal that the structures of all films are still cubic NiO structure. Average grain size of Zn <inf>x</inf>Ni <inf>1 - x</inf>O film increases with increasing annealing temperature and its crystallization is strongly affected by Zn content. Coloration of the films was obtained after UV/ozone exposure due to a presence of ozone-induced hydroxyl groups. Significant enhancement of coloration efficiency of the films is achieved as content of Zn increases. © 2011 Elsevier B.V. All rights reserved.
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    Ozone-induced optical density change of NiO thin films and their applicability as neutral optical density filter
    (2011-05-02)
    Noonuruk, R.
    ;
    Wongpisutpaisan, N.
    ;
    Mukdacharoenchai, P.
    ;
    Techitdheera, W.
    ;
    Pecharapa, W.
    Nickel oxide (NiO) thin films were deposited onto glass substrates by sol-gel spin-coating technique. The coating solution was prepared by reacting nickel acetate tetrahydrate as precursor and absolute ethanol as solvent. The asdeposited films were annealed in air at 350oC. The color of the film can be changed from bleach color to be dark brownish after UV/ozone treatment. The change in optical density of more than 40% can be achieved after 5 min of treatment. The colored films can be readily recovered by thermal treatment at 150°C within 30 min. Further increasing ozone exposure time leads to greater change in optical density. The presence of ozone-induced hydroxyl groups causes the color change of the films. The unique behavior of this chromic material can be applied as novel tunable neutral optical density filters and related devices by ozone-assisted method.