(0 0 1) Facets optimized surface oxygen vacancies in TiO2 films to enhance photocatalytic antibacterial and hydrophilic properties

作者：Zhiquan Huang, Zhongshu Li, Xiyu Zhang, Zhongxing Zhang, Jian Chen · 发表于：Applied Surface Science · 年份：2023 · DOI：10.1016/j.apsusc.2023.156571 · 被引用次数：11 · 研究领域：TiO2 Photocatalysis and Solar Cells、Advanced Photocatalysis Techniques、Advanced Nanomaterials in Catalysis

Oxygen vacancies (OVs) engineering is one of the most common methods for enhancing the photocatalytic activities of titanium dioxide (TiO 2 ). Although the effect is affected by the spatial distribution of OVs, little is known about how exposed facets affect the generated OVs. Therefore, we fabricate the anatase-TiO 2 films with different preferred orientations ((0 0 1) and (1 0 1) facets) on glass by magnetron sputtering and heat treatment, after that the OVs are induced in TiO 2 films by hydrogen plasma treatment at 300 °C. Through ultraviolet–visible spectroscopy, X-ray photoelectron spectroscopy and electron paramagnetic resonance analyses, the results indicate that (0 0 1) preferred orientation raise the concentration of surface OVs due to the lower OVs formation energy and the higher barrier for subsurface migration. The (0 0 1) preferred film (ht-p_2) shows the best photocatalytic performance. Within 150 min of being exposed to UV light, the degradation rate constants of methyl orange (MO) can reach 0.0029/min and 0.0022/min in 12 mg/L and 24 mg/L, respectively, which are about 2.4 times higher than the film without (0 0 1) preference. Transient photocurrent test results of ht-p_2 with the obvious increase in current density (24.9 μA/cm 2 ) also prove that the TiO 2 film with more surface OVs has a higher carrier separation efficiency, which plays a significance role in promoting the photocatalytic activities. What’s more, the results of photoinduced hydrophilicity and...