基于溶液配位化学过程调控的中空单晶氧化铁纳米材料

本文简要综述了本课题组近年来在单晶氧化铁空心纳米结构制备与生长机理研究方面的相关工作.通过采用磷酸根与硫酸根的双阴离子调节,结合反应时间、反应温度等条件的改变,实现了对α-Fe2O3单晶空心纳米结构形貌、尺寸和表面结构的良好调控,并提出一种针对非层状结构纳米环/纳米管新颖生长机理,即"配位辅助的定向溶解机理".以所制备的α-Fe2O3为前驱体,采用气相还原方法,成功制备得到了系列单晶Fe3O4和γ-Fe2O3管状及环状纳米结构,并对单个Fe3O4纳米环的磁学行为进行了考察.

Synthesis of single crystalline iron oxide hollow nanostructures by the principle of coordination chemistry in solution-based process

This review briefly summarizes our recent progresses in the controlled synthesis of single crystalline iron oxides hollow nanostructures. Using both phosphate and sulfate ions as mineralizing agents, by controlling the reaction conditions, such as the reaction temperature, reaction time, etc., we have successfully synthesized a series of single crystalline of α-Fe2O3 hollow nanostructures including nanotubes, nanorings and tube-in-tubes, with controlled sizes and surface structures by a facile hydrothermal method. In addition to the synthetic protocols, we propose a novel mechanism-＂coordination assisted preferential dissolution mechanism＂, which is responsible for the formation of non-layered nanotube/nanoring. With the as-prepared α-Fe2O3 products as precursors, single crystalline Fe3O4 and γ-Fe2O3 nanotubes/nanorings were also prepared through a gas-phase reduction process. Besides, the magnetic properties of a single Fe3O4 nanoring were also investigated using electron tomography technique.