Alcohol induced liquid-phase synthesis of rutile titania nanotubes

详细信息    查看全文

• 作者：Jinhong Yan ; Shouai Feng ; Haiqiang Lu ; Jian Wang ; Jianfeng Zheng ; Jianghong Zhao ; Li Li ; Zhenping Zhu
• 关键词：Titanium dioxide ; Low-temperature synthesis ; Ethanol ; Phase transformation
• 刊名：Materials Science and Engineering: B
• 出版年：2010
• 出版时间：25 August 2010
• 年：2010
• 卷：172
• 期：2
• 页码：114-120
• 全文大小：753 K

文摘

Pure rutile nanotubes were synthesized by a hydrothermal process in NaOH water–ethanol solution, starting from rutile-anatase TiO₂ particles. The length of nanotubes is up to several micrometers and their diameter is uniform and not more than 20 nm. Although rutile phase is the high-temperature polymorph of anatase, the phase transformation from anatase of raw materials into rutile is realized at low-temperature (130 °C). The chelation of ethanol to the TiO₆ octahedra, which are the basic building blocks of titania and separated by the alkaline dismantling of the TiO₂ starting material, may play an important role for the phase transition. The nanotube evolution follows oriented assembly route from the seeds of the initially formed short nanotubes and with TiO₆ octahedra as building blocks. The types of alcohol and the ratio of ethanol and H₂O have a great impact on the morphology and structure of the final products. The rutile nanotubes present different opto-electronic properties from those of the raw TiO₂.