Synthesis of high aspect ratio titanate nanotubes
Synthesis of high aspect ratio titanate nanotubes
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DOI：
10.1039/c0jm01212b
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发表时间：
2010-07
影响因子：
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通讯作者：
L. Torrente‐Murciano;A. Lapkin;D. Chadwick
中科院分区：
文献类型：
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作者：
L. Torrente‐Murciano;A. Lapkin;D. Chadwick
使用水热法在静态和旋转高压釜（端对端）中在一定范围的旋转速度（0-20 rpm）下合成二氧化钛纳米管。揭示了钛酸盐纳米管的平均长度的控制在其合成过程中的旋转速度。随着旋转速度的增加，产生了更长的纳米管（在20 rpm下超过1 µm）。这一现象是由于传质的增加，有利于形成较长的中间钛酸盐纳米片。长纳米管自组装，形成二级结构而不转化成纳米线，如通过高比表面积、3.7 nm的孔径（内纳米管直径）、XRD和拉曼分析所证实的。在较高的旋转速度下观察到纳米管末端溶解的初始阶段。在静态合成中，TiO 2前体在NaOH溶液中的悬浮液的预超声处理导致纳米管的长度略微增加，但在旋转高压釜合成中没有任何影响。
Titanate nanotubes were synthesised using a hydrothermal method in a static and a rotating autoclave (end-over-end) over a range of rotation speeds (0–20 rpm). The control of the average length of the titanate nanotubes by the speed of rotation during their synthesis was revealed. As the rotation speed was increased, longer nanotubes (more than 1 µm at 20 rpm) were produced. This phenomenon was attributed to an increase in the mass transfer, facilitating the formation of longer intermediate titanate nanosheets. Long nanotubes self-assemble, forming secondary structures without transformation into nanowires as confirmed by the high specific surface area, pore size (inner nanotubes diameter) of 3.7 nm, XRD and Raman analyses. The initial phase of dissolution of the ends of the nanotubes was observed at higher rotation speeds. Pre-sonication treatment of the suspension of TiO2 precursor in NaOH solution resulted in a slight increase in the length of the nanotubes in the static synthesis, but did not have any effect in the rotating autoclave syntheses.