An approach toward TiO₂ nanostructure growth with tunable properties: Influence of reaction time in a hydrothermal process

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• 作者：Maocui Zhang ; Miao Zhang ; Shiwei Shi ; Xueping Song ; Zhaoqi Sun
• 关键词：TiO2 thin films ; Reaction time ; Nanostructure ; Optical properties
• 刊名：Journal of Alloys and Compounds
• 出版年：5 April, 2014
• 年：2014
• 卷：591
• 期：Complete
• 页码：213-217
• 全文大小：1521 K

文摘

An approach has been developed to prepare TiO₂ thin films with tunable morphology and physical properties by changing reaction time (6, 12 and 24 h) in a hydrothermal process. As the reaction time increases, anatase TiO₂ (1 0 1) preferred orientation is weaken, corresponding to surface morphology changes from one-dimensional nanowire structure to two-dimensional sheet structure then to three-dimensional nuts structure. Evolution of these structural are accompanied by significant variations of optical properties, photoluminescence and Raman properties including a widening of the band gap from 3.21 to 3.24 eV, strong luminescence in the visible area, increase of Raman characteristic peak intensity and frequency shift phenomenon of Raman characteristic peaks. Compositional analysis indicates that TiO₂ surface layer contains Ti and O elements, the ratio of Ti:O is 1:2.206 which is close to the atom ratio of TiO₂. These findings help to grow specific TiO₂ thin films with desired structure and properties for device applications.