University of Science, District 5, Ho Chi Minh City, 700000, Vietnam.
Dong Thap University, Ward 6, Cao Lanh City, Dong Thap Province, 870000, Vietnam.
J Nanosci Nanotechnol. 2020 Apr 1;20(4):2214-2222. doi: 10.1166/jnn.2020.17306.
Forming heterostructures based on hybrid photocatalysts has been considered as one of the most effective techniques for improving the photocatalytic efficacy of semiconductor photocatalysts. To address this issue, this article describes ZnO/TiO₂ heterojunction thin films that were produced via the direct current reaction magnetron sputtering technique and with varying thickness of TiO₂ coating. The structural, morphological, and optical features were thoroughly characterized by X-ray diffraction, scanning electron microscope, photoluminescence, and ultra-violet-visible transmission spectra. The photocatalytic and antibacterial ability were assessed by the photo-degradation of methyl orange (MO) aqueous solution and count method of bacteria. The results demonstrated that the photocatalytic and antimicrobial efficacy of the ZnO/TiO₂ heterojunction was found to vary depending on the morphology of the TiO₂ layer. In addition, their photocatalytic (91% MO degradation within 150 min) and antimicrobial efficacy (92.7% antibacterial efficiency within 90 min) were higher than the efficiency of either material alone. This could can be ascribed to the photogenerated charge carrier efficiency and hierarchical nanostructure with a large surface area. The mechanism for the improved photocatalytic performance has been discussed in detail.
基于杂化光催化剂形成异质结构被认为是提高半导体光催化剂光催化效率的最有效技术之一。针对这一问题，本文描述了通过直流反应磁控溅射技术制备的 ZnO/TiO₂ 异质结薄膜，其 TiO₂ 涂层厚度不同。通过 X 射线衍射、扫描电子显微镜、光致发光和紫外可见透射光谱对结构、形貌和光学特性进行了全面表征。通过光降解甲基橙（MO）水溶液和细菌计数法评估了光催化和抗菌能力。结果表明，ZnO/TiO₂ 异质结的光催化和抗菌效果取决于 TiO₂ 层的形态。此外，它们的光催化（150 分钟内 MO 降解 91%）和抗菌效果（90 分钟内抗菌效率 92.7%）高于单一材料的效率。这可以归因于光生载流子效率和具有大表面积的分层纳米结构。详细讨论了提高光催化性能的机制。
