TiO2纳米管阵列薄膜的水热晶化

首先在KF和乙二醇的混合溶液中利用阳极氧化技术在钛基底表面制得了一层排列整齐、形貌均一的TiO₂纳米管阵列薄膜,然后将制得的薄膜进行水热处理,通过扫描电子显微镜、X射线衍射仪等表征手段研究了水热处理温度和时间对TiO₂纳米管阵列薄膜表面形貌、结晶度以及管状结构的影响。结果表明:水热处理即使在较短的时间内（如3 h）也可在较低温度下（如210℃）使TiO₂纳米管阵列薄膜由无定形转变为锐钛矿型结构;提高水热处理温度或延长水热处理时间均可提高薄膜的结晶度,但同时纳米管管壁结晶度增加会使管内径变小甚至堵塞,从而破坏管状结构。

Hydrothermal Crystallization of TiO2 Nanotube Array Films

The highly ordered and uniform TiO2 nanotube array films were fabricated by anodic oxidation of titanium foil in KF-eontaining ethylene glycol solution. The as-prepared TiO2 nanotube array films were then hydrothermally treated, and the effects of hydrotbermal treatment temperature and time on the surface morphoIogy, crystallinity, and tubular structure of the nanotube films were investigated by X-ray diffraction and scanning electron microscopy. The results show that a transition from amorphous structure to anatase TiO2 could be found after hydrothermal treatment even for a short time （e. g. 3 h） at relatively low temperature （e, g. 210 ℃）, and the crystallization degree increased with the improving of hydrothermal treatment temperature and time. The crystallization process of nanotube walls during hydrotbermal treatment would lead to a decrease in inner diameter of the nanotubes and even a collapse of tubular structure when the crystallization degree was too high.