The Principle of Vapor-Phase Technics and Application in Synthesis of M_xO_y Nanomaterials

摘要

The vapor-phase hydrolysis method is practical and effective for the synthesis of nanomaterials. The principle of preparation for nanomaterials via vapor-phase hydrolysis technics was introduced in this paper. Based on the principle of vapor-phase, the invention of the vapor-phase hydrolysis equipment for nanomaterial synthesis was also detailed, which realized an adjustable process automatic control effect. The preparation of nanocrystalline ZrO2 powders by vapor-phase hydrolysis equipment was applied and the ZrO2 powders were characterized. The formation process of the nanoparticles was analyzed. The results showed that the morphology and size of the MxOy (M = Zr, Ti, Hf, Al, et al.) nanoparticles were very much dependent on the molar of water, which played an important part in determining the characteristics of the MxOy nanoparticles. When increasing the concentration of water to decrease the collision rate and to prevent nanoparticle agglomeration, the size distribution of the MxOy nanoparticle product would be decreased and the monodispersed nanoparticle would be achieved. This route is easy and free of drying and calcination processes, which are essential for wet chemical/physical preparation process and can be popularized to the synthesis of MxOy nanomaterials.