Chen Jian-Zhi, Chen Tai-Hong, Lai Li-Wen, Li Pei-Yu, Liu Hua-Wen, Hong Yi-You, Liu Day-Shan
Institute of Electro-Optical and Materials Science, National Formosa University, Huwei, Yunlin 63201, Taiwan.
Industrial Technology Research Institute South, Liujia Shiang, Tainan 734, Taiwan.
Materials (Basel). 2015 Jul 13;8(7):4273-4286. doi: 10.3390/ma8074273.
This study achieved a nanocomposite structure of nickel oxide (NiO)/titanium dioxide (TiO₂) heterojunction on a TiO₂ film surface. The photocatalytic activity of this structure evaluated by decomposing methylene blue (MB) solution was strongly correlated to the conductive behavior of the NiO film. A -type NiO film of high concentration in contact with the native -type TiO₂ film, which resulted in a strong inner electrical field to effectively separate the photogenerated electron-hole pairs, exhibited a much better photocatalytic activity than the controlled TiO₂ film. In addition, the photocatalytic activity of the NiO/TiO₂ nanocomposite structure was enhanced as the thickness of the -NiO film decreased, which was beneficial for the migration of the photogenerated carriers to the structural surface.
本研究在二氧化钛（TiO₂）薄膜表面实现了氧化镍（NiO）/二氧化钛（TiO₂）异质结的纳米复合结构。通过分解亚甲基蓝（MB）溶液评估该结构的光催化活性，其与NiO薄膜的导电行为密切相关。与本征型TiO₂薄膜接触的高浓度A型NiO薄膜形成了强大的内电场，有效地分离了光生电子 - 空穴对，其光催化活性比对照TiO₂薄膜要好得多。此外，随着NiO薄膜厚度的减小，NiO/TiO₂纳米复合结构的光催化活性增强，这有利于光生载流子向结构表面迁移。
