水热法制备新型TiO_2薄膜及其机理

Hydrothermal synthesis of a novel bilayer TiO_2 film and its mechanism

用酞酸丁酯和盐酸通过两步水热法制备了一种新型双层Ti O2薄膜。其水热过程包括生长过程和刻蚀过程。在生长过程制备了一种上层为纳米棒团簇,下层为纳米棒阵列的双层结构。在随后的刻蚀过程中,上层的纳米棒团簇转变为纳米管团簇,下层的纳米棒阵列转变为直径在20~25 nm的纳米线阵列。刻蚀过程上下两层出现不同形貌的主要原因为金红石相Ti O2的各向异性以及纳米棒外壁和内部的不同界面能。新型薄膜作为染料敏化太阳能电池的光阳极时能量转换效率高。

A novel bilayer Ti O2 film was prepared via two step hydrothermal method. One step was growth process and the other was etching process. A bilayer film consisting of nanorod arrays at bottom layer and nanorod clusters at top layer was obtained by first hydrothermal method. Etching process was used to acquire nanotube arrays with smaller diameter of 20-25 nm and nanotube clusters. During the etching process,two kinds of morphology changes were observed at top layer and bottom layer respectively due to two main reasons. One results from the anisotropic rutile Ti O2,and another is the difference of interfacial energy between inner and out surface of the nanorod. The novel bilayer can enhance the energy transition efficiency of photo anodes for dye sensitized solar cells.