A Versatile Kinetics-Controlled Coating Method To Construct Uniform Porous TiO2 Shells for Multifunctional Core鈥揝hell Structures

详细信息    查看全文

• 作者：Wei Li ; Jianping Yang ; Zhangxiong Wu ; Jinxiu Wang ; Bin Li ; Shanshan Feng ; Yonghui Deng ; Fan Zhang ; Dongyuan Zhao
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：July 25, 2012
• 年：2012
• 卷：134
• 期：29
• 页码：11864-11867
• 全文大小：329K
• 年卷期：v.134,no.29(July 25, 2012)
• ISSN：1520-5126

文摘

The development of a simple and reproducible route to prepare uniform core@TiO₂ structures is urgent for realizing multifunctional responses and harnessing multiple interfaces for new or enhanced functionalities. Here, we report a versatile kinetics-controlled coating method to construct uniform porous TiO₂ shells for multifunctional core鈥搒hell structures. By simply controlling the kinetics of hydrolysis and condensation of tetrabutyl titanate (TBOT) in ethanol/ammonia mixtures, uniform porous TiO₂ shell core鈥搒hell structures can be prepared with variable diameter, geometry, and composition as a core (e.g., 伪-Fe₂O₃ ellipsoids, Fe₃O₄ spheres, SiO₂ spheres, graphene oxide nanosheets, and carbon nanospheres). This method is very simple and reproducible, yet important, which allows an easy control over the thickness of TiO₂ shells from 0 to 25, 45, and 70 nm. Moreover, the TiO₂ shells possess large mesoporosities and a uniform pore size of 2.5 nm, and can be easily crystallized into anatase phase without changing the uniform core鈥搒hell structures.