New Mechanistic Insight of Low Temperature Crystallization of Anodic TiO2 Nanotube Array in Water

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• 作者：Yulong Liao ; Xiaoyi Wang ; Yanbing Ma ; Jie Li ; Tianlong Wen ; Lijun Jia ; Zhiyong Zhong ; Liping Wang ; Dainan Zhang
• 刊名：Crystal Growth & Design
• 出版年：2016
• 出版时间：April 6, 2016
• 年：2016
• 卷：16
• 期：4
• 页码：1786-1791
• 全文大小：486K
• ISSN：1528-7505

文摘

A facile low-temperature crystallization method was recently developed for the synthesis of anodic TiO₂ nanotubes (NTs). This novel method requires less energy and less sophisticated equipment than traditional high-temperature sintering, but the underlying mechanisms have not yet been elucidated. Here, we systematically studied the low-temperature crystallization mechanism of anodic TiO₂ NTs by using different solvents and treatment time. For the first time, we notice a dramatic change of the surrounding water and discuss the TiO₂ nanocrystals (NCs) byproducts of the low-temperature crystallization process. Accordingly, we propose a dissolution–recrystallization mechanism in which dissolved Ti(OH)₆^2– dehydrates and crystallizes in situ to form anatase NTs as well as anatase NCs. Overall, this work provides a mechanistic insight into this low-temperature crystallization method, which could benefit the optimization and scale-up of industrial TiO₂ NT production.