Synthetic Chemistry Lab., Kawamura Institute of Chemical Research, 631 Sakado, Sakura, 285-0078 Japan.
Langmuir. 2010 Mar 16;26(6):4212-8. doi: 10.1021/la9038655.
We report using the substrates covered with self-organized linear polyethylenimine (PEI) layer as biomimetic template to direct the formation of high-quality titania coat with well-defined nanofiber-based network structure. The titania deposition was simply achieved by dipping the PEI substrates into aqueous solution of titanium bislactate under ambient conditions. We found that crystalline PEI layer on the substrates is important for achieving titania coat with nanofiber-based structure. Compared to the titania powder formed by solution deposition, the interface-mediated nanostructured titania exhibited dramatically improved thermostability with being able to maintain anatase phase in majority even at 900 degrees C. Moreover, the nanostructures of titania coat could be well controlled by simply adjusting the formation conditions of crystalline PEI layer on substrates. Because of high-efficiency photocatalysis of anatase titania, the nanostructured surface exhibited good photoresponsive surface wettability through hydrophobic modification and light irradiation.
我们报告了使用覆盖有自组装线性聚乙烯亚胺（PEI）层的基底作为仿生模板，来引导具有良好定义的基于纳米纤维的网络结构的高质量二氧化钛涂层的形成。在环境条件下，通过将 PEI 基底浸入钛双乳酸盐水溶液中，简单地实现了二氧化钛的沉积。我们发现，基底上的结晶 PEI 层对于获得具有纳米纤维结构的二氧化钛涂层是重要的。与通过溶液沉积形成的二氧化钛粉末相比，界面介导的纳米结构二氧化钛表现出显著提高的热稳定性，即使在 900°C 下也能保持大部分锐钛矿相。此外，通过简单地调整基底上结晶 PEI 层的形成条件，可以很好地控制二氧化钛涂层的纳米结构。由于锐钛矿型二氧化钛的高效光催化作用，通过疏水性修饰和光照射，纳米结构表面表现出良好的光响应表面润湿性。
