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ZnS coating for enhanced environmental stability and improved properties of ZnO thin films

机译：ZnS涂层，用于增强的环境稳定性和ZnO薄膜的改善性能

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摘要

Low environmental stability of ZnO nanostructures in hydrophilic systems is a crucial factor limiting their practical applications. ZnO nanomaterials need surface passivation with different water-insoluble compounds. This study describes a one-step passivation process of polycrystalline ZnO films with ZnS as a facile method of ZnO surface coating. A simple sulfidation reaction was carried out in gas-phase H2S and it resulted in formation of a ZnS thin layer on the ZnO surface. The ZnS layer not only inhibited the ZnO dissolving process in water but additionally improved its mechanical and electrical properties. After the passivation process, ZnO/ZnS films remained stable in water for over seven days. The electrical conductivity of the ZnO films increased about 500-fold as a result of surface defect passivation and the removal of oxygen molecules which can trap free carriers. The nanohardness and Young's modulus of the samples increased about 64% and 14%, respectively after the ZnS coating formation. Nanowear tests performed using nanoindentation methods revealed reduced values of surface displacements for the ZnO/ZnS system. Moreover, both ZnO and ZnO/ZnS films showed antimicrobial properties against Escherichia coli.
机译：亲水系统中ZnO纳米结构的低环境稳定性是限制其实际应用的关键因素。 ZnO纳米材料需要用不同的水不溶性化合物表面钝化。该研究描述了具有ZnS的多晶ZnO膜的一步钝化过程作为ZnO表面涂层的容易方法。在气相H 2 S中进行简单的硫化反应，并导致在ZnO表面上形成ZnS薄层。 ZnS层不仅抑制了水中的ZnO溶解过程，而且还改善了其机械和电性能。在钝化过程之后，ZnO / ZnS薄膜在水中保持稳定，超过七天。由于表面缺陷钝化和去除可以捕获游离载体的氧分子，ZnO膜的电导率增加约500倍。在ZnS涂层形成之后，样品的纳米和杨氏模量分别增加了约64％和14％。使用纳米肾序方法进行的纳瓦型测试显示了ZnO / ZnS系统的表面位移的降低。此外，ZnO和ZnO / ZnS薄膜均显示对大肠杆菌的抗微生物性质。

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