Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, People's Republic of China.
ACS Appl Mater Interfaces. 2013 Jul 10;5(13):6201-7. doi: 10.1021/am401167y. Epub 2013 Jun 26.
In this work, a novel photocatalyst, polypyrrole (PPy)-decorated Ag-TiO2 nanofibers (PPy-Ag-TiO2) with core-shell structure, was successfully synthesized using an electrospinning technique, followed by a surfactant-directed in situ chemical polymerization method. The results show that a PPy layer was formed on the surface of Ag-TiO2 nanofiber, which is beneficial for protecting Ag nanoparticles from being oxidized. Meanwhile, the PPy-Ag-TiO2 system exhibits remarkable light absorption in the visible region and high photocurrent. Among them, the 1%-PPy-Ag-TiO2 sample shows the highest photoactivity, which is far exceeds that of the single- and two-component systems. This result may be due to the synergistic effect of Ag, PPy, and TiO2 nanostructures in the ternary system.
在这项工作中，我们成功地使用电纺丝技术和表面活性剂导向的原位化学聚合方法合成了具有核壳结构的新型光催化剂——聚吡咯（PPy）修饰的 Ag-TiO2 纳米纤维（PPy-Ag-TiO2）。结果表明，在 Ag-TiO2 纳米纤维表面形成了一层 PPy 层，这有利于保护 Ag 纳米粒子不被氧化。同时，PPy-Ag-TiO2 体系在可见光区域具有显著的光吸收和高光电流。其中，1%-PPy-Ag-TiO2 样品表现出最高的光活性，远远超过了单组分和双组分体系。这一结果可能归因于三元体系中 Ag、PPy 和 TiO2 纳米结构的协同效应。
