水热合成TiO_2纳米线阵列及其生长机理的研究

Hydrothermal synthesis of TiO_2 nanowire arrays and its growth mechanism

利用水热合成方法制备了TiO_2纳米线阵列薄膜。研究发现,反应溶液浓度对TiO_2晶型及形貌具有较大的影响。当钛酸丁酯质量浓度为1.2%~1.6%时,可生长出大面积纳米线阵列膜,且薄膜均匀致密,与衬底附着性好;当钛酸丁酯质量浓度为1.4%~1.6%时,纳米线取向更加一致,尺寸更均匀。用该方法制备的TiO_2纳米线为金红石结构,结晶度较好。文章分析了纳米棒的生长机理,并指出反应液浓度影响水解反应速率,适当的反应速率可以生长出均匀形核,并沿垂直于衬底的方向生长,形成TiO_2纳米线阵列膜。

TiO_2 nanowires array films were prepared by using hydrothermal synthesis method.Research found that reaction solution concentration had a significant influence on structure and morphology of TiO_2 nanowires array. When the butyl titanate concentration was about 1.2%~1.6%,TiO_2 nanowire array films were uniform, compact and had good adhesion with the substrate. Especially TiO_2 nanowire array films fabricated by concentration of 1.4%~1.6% was more consistent and uniform. All of the TiO_2 nanowires array films were rutile structure. At the same time, the growth mechanism of TiO_2 nanowires arrays was analyzed in detail, the appropriate reaction rate was able to achieve an uniform nucleation, which leaded to grow vertically on the substrate and form TiO_2 nanowire array.