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首页> 外文期刊>Applied Surface Science >Spray pyrolytic synthesis of large area NiOx thin films from aqueous nickel acetate solutions
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Spray pyrolytic synthesis of large area NiOx thin films from aqueous nickel acetate solutions

机译：醋酸镍水溶液的喷雾热解合成大面积NiOx薄膜

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Non-stoichiometric nickel oxide thin films were prepared by pyrolytic decomposition of aerosol droplets of aqueous nickel acetate solution. Conventional un-nebulized spray pyrolysis system was used for the synthesis of thin films. The fine droplets were atomized by employing compressed air as carrier gas and allowed to decompose onto pre-heated Sn doped In2O3 (ITO) coated glass. The preparative parameters such as substrate temperature, solution concentration, distance from spray-nozzle to substrate, pressure of carrier air, etc., were optimized to obtain large area, uniform, thin films. The appropriate substrate temperature was selected after thermo-gravimetric analysis of nickel acetate. The temperature range of 330-420 degrees C was investigated for pyrolysis. Structural studies using X-ray diffraction (XRD) show the formation of cubic NiO. Morphological aspects of the films as-prepared and air annealed films have been studied by employing scanning electron microscopy. The optical absorption studies give direct band gap equal to 3.61 eV. The compositional analysis was carried out from the elemental depth profiles employing Auger electron spectroscopy. These indicate the formation of non-stoichiometric nickel oxide thin films. By studying I-V characteristics in alkaline electrolyte, electrocatalytic activity is tested. (c) 2006 Elsevier B.V. All rights reserved.
机译：通过热分解乙酸镍水溶液的气溶胶液滴制备非化学计量的氧化镍薄膜。常规的非雾化喷雾热解系统用于合成薄膜。通过使用压缩空气作为载气将细小液滴雾化，并使其分解到预热的掺Sn的In2O3（ITO）涂层玻璃上。优化了制备参数，例如基材温度，溶液浓度，从喷嘴到基材的距离，载气压力等，以获得大面积，均匀的薄膜。在对乙酸镍进行热重分析后选择合适的基材温度。研究了330-420℃的温度范围以进行热解。使用X射线衍射（XRD）进行的结构研究显示了立方NiO的形成。通过使用扫描电子显微镜研究了所制备的膜和空气退火的膜的形态学方面。光吸收研究得出直接带隙等于3.61 eV。使用俄歇电子能谱从元素深度轮廓进行组成分析。这些表明形成了非化学计量的氧化镍薄膜。通过研究碱性电解质中的I-V特性，可以测试电催化活性。 （c）2006 Elsevier B.V.保留所有权利。

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