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首页> 外文期刊>Materials Research Innovations >Photoelectrocatalytic activity of spray deposited ZnO thin films against E. coli Davis
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Photoelectrocatalytic activity of spray deposited ZnO thin films against E. coli Davis

机译：喷雾沉积ZnO薄膜对大肠杆菌戴维斯的光电催化活性

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Zinc oxide (ZnO) thin films have been deposited onto fluorine doped tin oxide coated glass substrates by economical chemical spray pyrolysis technique. Films were deposited using various quantities of solution from 50 to 200 cc (substrate temperature 400°C, solution concentration 0·2M) in order to achieve different thicknesses. The films were characterised by X-ray diffraction, SEM, AFM and optical absorption techniques. The films exhibit a hexagonal wurtzite crystal structure with preferred (002) orientation. Morphological study showed a smooth and nanocrystalline surface of ZnO films. Direct optical band gap energy of ZnO thin films is found to be 3·24 eV. The average transmission is of the order of 87% in the visible region. The photoelectrocatalytic response of the film against Escherichia coli Davis is studied using a specially designed photoelectrochemical (PEC) reactor module. Thickness and UV light dependent photoelectrocatalytic bactericidal properties of ZnO thin films have been investigated. It shows that biased 1·1 μm thick ZnO thin films with 2 mW cm−2 UV light intensity give better bactericidal response compared to others. The relative percentage of killing of bacteria is 19·81% due to UV illumination, 52·71% due to UV illumination and passing over ZnO surface and 95·03% due to UV illumination and passing through PEC reactor with ZnO thin film after 2·5 h. It can be concluded that the ZnO thin film with photochemical reactor can be used in a water purifier to get bacteria free drinking water.
机译：氧化锌（ZnO）薄膜已通过经济的化学喷雾热解技术沉积在掺氟的氧化锡涂层玻璃基板上。为了获得不同的厚度，使用50到200 cc的各种溶液（基板温度为400°C，溶液浓度为0·2M）沉积膜。通过X射线衍射，SEM，AFM和光吸收技术对薄膜进行表征。该膜表现出具有优选的（002）取向的六方纤锌矿晶体结构。形态学研究表明，ZnO薄膜具有光滑的纳米晶表面。 ZnO薄膜的直接光学带隙能量为3·24 eV。在可见光区域，平均透射率约为87％。使用专门设计的光电化学（PEC）反应器模块研究了膜对大肠杆菌Davis的光电催化响应。研究了ZnO薄膜的厚度和紫外光依赖性的光电催化杀菌性能。结果表明，与其他相比，具有2 mW cm-2紫外光强度的偏斜的1·1μm厚ZnO薄膜具有更好的杀菌效果。紫外线照射后杀死细菌的相对百分比为19·81％，紫外线照射并通过ZnO表面的相对杀死率为52·71％，紫外线照射并经过带有ZnO薄膜的PEC反应器的紫外线照射后95％〜03％。 ·5小时可以得出结论，带光化学反应器的ZnO薄膜可用于净水器中，以得到无细菌的饮用水。

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