The spray pyrolysis technique was employed to deposit In, Fe-In and Sn-In doped zinc oxide thin films on borosilicate glass substrates with two different precursor solutions prepared using deionized water and methanol-deionized water. The samples were probed for their antibacterial properties against , along with characterisation of their structural and optical properties. X-ray diffraction patterns depicted the zincite phase of the deposited ZnO nanoparticles in all cases. However, in the thin films deposited using methanol-water, a preferential orientation along the (002) plane was favoured with the evolution of typical nanoparticle morphologies, e.g. nanospheres in undoped and In doped ZnO, nanoflakes in Fe-In doped ZnO and nanospindles in Sn-In doped ZnO thin films. Deionized water did not lead to any typical transformation in morphology other than the change in nanoparticle size. The particle size varied in the range 26–110 nm for methanol-deionised water derived ZnO samples, whereas it varied in the range 22–37 nm for water derived samples. The optical band gap of ZnO was found to be narrowed by doping with In, Fe-In and Sn-In. The antibacterial action against is attributed to the excess oxygen present in the film, which directly generates reactive oxygen species. Zn ions are found to have a minimal role in the bactericidal action. Accordingly, Fe-In doping results in optimum antibacterial properties in ZnO and the resulting films could be a promising candidate for food processing industries.

中文翻译：

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探讨化学计量对 ZnO 薄膜对大肠杆菌的结构、光学和细菌生长抑制特性的影响

采用喷雾热解技术，用去离子水和甲醇-去离子水制备的两种不同的前驱体溶液在硼硅酸盐玻璃基板上沉积In、Fe-In和Sn-In掺杂的氧化锌薄膜。研究了样品的抗菌特性，以及其结构和光学特性的表征。X 射线衍射图描绘了所有情况下沉积的 ZnO 纳米颗粒的红锌矿相。然而，在使用甲醇-水沉积的薄膜中，沿着（002）平面的优先取向有利于典型纳米颗粒形态的演变，例如未掺杂和In掺杂ZnO中的纳米球、Fe-In掺杂ZnO中的纳米片和Sn-In 掺杂 ZnO 薄膜。除了纳米颗粒尺寸的变化之外，去离子水不会导致任何典型的形态转变。对于甲醇-去离子水衍生的 ZnO 样品，粒径变化范围为 26–110 nm，而对于水衍生样品，粒径变化范围为 22–37 nm。ZnO 的光学带隙被发现通过掺杂 In、Fe-In 和 Sn-In 而变窄。抗菌作用归因于薄膜中存在过量的氧气，直接产生活性氧。发现锌离子在杀菌作用中的作用很小。因此，Fe-In 掺杂使 ZnO 具有最佳的抗菌性能，所得薄膜可能成为食品加工行业的有希望的候选者。