Morphology Evolution Of Rutile Particles From Nanorods To Microcones, Again Microspheres Via Self-assembly In Ionic Liquids (ils) Solution

摘要

Morphology evolution of rutile particles from nanorods to microcones, again microspheres were realized with the increasing of TiCl_4 via self-assembly under hydrothermal condition. A kind of ionic liquids, 1-octyl-3-methylimidazole bromide ([C_8mim]Br) was used to assist the fabrication of rutile nanostructures in the system. Characterizations of the products were performed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). SEM and TEM micrographs showed that the presence of [C_8mim]Br apparently resulted in the aggregation of rutile particles via self-assembly, till porous structures was formed on the surface of microspheres. Moreover, the microspheres were easy to crack when they were precipitated from solution, and the cracks can be widened under radiation of electron beam, simultaneously accompanied by the exfoliation of rutile whiskers. The corresponding mechanism of self-assembly was proposed to explain the effect of [C_8mim]Br on fabrication of these rutile nanostructures.