Kong Lina, Wang Changhua, Wan Fangxu, Li Lan, Zhang Xintong, Liu Yichun
Institute of Material Physics, Key Laboratory of Display Materials and Photoelectric Devices of Ministry of Education, Key Laboratory for Optoelectronic Materials and Devices of Tianjin, College of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300191, China.
Dalton Trans. 2017 Nov 14;46(44):15363-15372. doi: 10.1039/c7dt03057f.
Doping and tailoring of the crystal orientation are two main strategies to improve the photocatalytic properties of TiO films. Herein, we introduce a novel route for obtaining Nb-doped TiO anatase films with the [001] preferred orientation by thermal oxidation of the [100]-oriented Nb-doped TiN film prepared by magnetron sputtering. Comprehensive analyses with X-ray diffraction, Raman scattering, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy indicate that the proportion of high-energy (001) facets of the Nb-doped TiO film is more than 90% and the Nb ion is successfully doped into the film without destroying the crystallinity and orientation. Moreover, the Nb ion doping significantly restrains the growth of the TiO grains and increases the surface roughness, and consequently increases the surface-reactive sites. Therefore, the as-fabricated Nb-doped TiO film exhibits efficient photocatalytic oxidation performance for acetaldehyde and oleic acid decomposition under simulated solar light irradiation. Such Nb-doped TiO anatase films with high-reactivity (001) facet exposure may find applications in the photocatalysis and solar energy conversion fields.
掺杂和调整晶体取向是改善TiO薄膜光催化性能的两种主要策略。在此，我们介绍了一种通过对磁控溅射制备的[100]取向的Nb掺杂TiN薄膜进行热氧化来获得具有[001]择优取向的Nb掺杂TiO锐钛矿薄膜的新途径。通过X射线衍射、拉曼散射、高分辨率透射电子显微镜和X射线光电子能谱的综合分析表明，Nb掺杂TiO薄膜的高能(001)面比例超过90%，且Nb离子成功掺杂到薄膜中而不破坏其结晶度和取向。此外，Nb离子掺杂显著抑制了TiO晶粒的生长并增加了表面粗糙度，从而增加了表面反应位点。因此，所制备的Nb掺杂TiO薄膜在模拟太阳光照射下对乙醛和油酸分解表现出高效的光催化氧化性能。这种具有高反应活性(001)面暴露的Nb掺杂TiO锐钛矿薄膜可能在光催化和太阳能转换领域找到应用。
