Jia Xingtao, He Wen, Zhang Xudong, Zhao Hongshi, Li Zhengmao, Feng Yingjun
Department of Materials Science and Engineering, Shandong Institute of Light Industry, Jinan, 250100, People's Republic of China. College of Chemistry and Chemical Engineering, China University of Petroleum, Dongying, 257061, People's Republic of China.
Nanotechnology. 2007 Feb 21;18(7):075602. doi: 10.1088/0957-4484/18/7/075602. Epub 2007 Jan 12.
Pure anatase TiO(2) nanorods with mesopores were synthesized by a simple and low cost microwave-assisted method when tri-block copolymer was used as a structure stabilization agent and TiCl(4) as metal precursor. TEM investigation showed that larger nanorods were assembled by pearl-necklace-shaped nanorods following an oriented attachment mechanism in a specific direction. A proposed hypothetical scheme showed that the formation of lyotropic titania liquid crystal (TLC) serves a key role in the stabilization of nanorods, and the mesopores on nanorods are derived from the vacancy of inter-particles of nanorods and regions lacking inorganic precursors in the TLC structure. Control experiments showed that microwave treatment plays a key role in the maintenance of original morphologies and mesostructures free from destruction even under high temperature calcinations.
以三嵌段共聚物为结构稳定剂、四氯化钛为金属前驱体，通过简单且低成本的微波辅助法合成了具有介孔的纯锐钛矿型二氧化钛纳米棒。透射电子显微镜研究表明，较大的纳米棒是由珍珠项链状纳米棒按照特定方向的定向附着机制组装而成。一个提出的假设方案表明，溶致二氧化钛液晶（TLC）的形成在纳米棒的稳定中起关键作用，纳米棒上的介孔源自纳米棒颗粒间的空位以及TLC结构中缺乏无机前驱体的区域。对照实验表明，即使在高温煅烧下，微波处理在保持原始形态和介观结构不被破坏方面也起着关键作用。
