School of Printing and Packaging and School of Chemistry and Molecular Science, ‡Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, §Center for Electronic Microscopy and School of Physics and Technology, Wuhan University , Wuhan 430072, P. R. China.
ACS Appl Mater Interfaces. 2012 Jul 25;4(7):3602-9. doi: 10.1021/am300669a. Epub 2012 Jun 21.
Mesoporous spindlelike iron oxide/ZnO core-shell heterostructures are successfully fabricated by a low-cost, surfactant-free, and environmentally friendly seed-mediate strategy with the help of postannealing treatment. The material composition and stoichiometry, as well as these magnetic and optical properties, have been examined and verified by means of high-resolution transmission electron microscopy and X-ray diffraction, the thickness of ZnO layer can be simply tailored by the concentration of zinc precursor. Considering that both α-Fe2O3 and ZnO are good photocatalytic materials, we have investigated the photodegradation performances of the core-shell heterostructures using organic dyes Rhodamin B (RhB). It is interesting to find that the as-obtained iron oxides/ZnO core-shell heterostructures exhibited enhanced visible light or UV photocatalytic abilities, remarkably superior to the as-used α-Fe2O3 seeds and commercial TiO2 products (P25), mainly owing to the synergistic effect between the narrow and wide bandgap semiconductors and effective electron-hole separation at the interfaces of iron oxides/ZnO.
介孔纺锤状氧化铁/氧化锌核壳结构通过一种低成本、无表面活性剂、环保的种子介导策略，在退火处理的帮助下成功制备。利用高分辨率透射电子显微镜和 X 射线衍射对材料的组成和化学计量比，以及磁性和光学性质进行了测试和验证。通过改变锌前驱体的浓度，可以简单地调节 ZnO 层的厚度。由于α-Fe2O3 和 ZnO 都是良好的光催化材料，我们使用有机染料罗丹明 B（RhB）研究了核壳结构的光降解性能。有趣的是，所得到的氧化铁/氧化锌核壳结构表现出增强的可见光或紫外光光催化能力，明显优于所使用的α-Fe2O3 种子和商业 TiO2 产品（P25），主要归因于窄带隙和宽带隙半导体之间的协同效应以及在铁氧化物/氧化锌界面处的有效电子-空穴分离。
