Preparation And Morphology Control Of Several Inorganic Oxides Micro- And Nanomaterials

Fabrication of nanocrystals with tailored morphologies and geometries has been attracting vast interest in the field of nanotechnology. The ability for shape control and functionalization of nanomaterials during synthesis plays a crucial role in their application potential. Inorganic oxides nanomaterials are the important part of the nanomaterials, and have been widely investigated. Inorganic oxides nanomaterials have potential applications in many areas, such as in photoelectric, sensors, electronic, energy conversion and storage, catalytic, and so on. To date, a great many achievements have been made in research on inorganic oxides nanomaterials. However, there are still many questions remain to be answered and broke through. Developing new and effective methods to prepare nanomaterials, preparation of new structural nanomaterials, and investigation of new properties of nanomaterials are still the important research topics of inorganic oxides nanomaterials. On the basis of this background, the present dissertation makes some research work on developing new methods to prepare new and morphology-controlled nanomaterials. The main contents of this dissertation include the following aspects:1. In the solvothermal reaction system with ethylene glycol as the solvent, size-controlled monodisperse magnetic monocrystalline Fe3O4 microspheres are prepared by controlling the nucleus-growth process of Fe sources at high temperature and pressure. These microspheres express porous hollow clusters which are composed of numorous magnetic monocrystalline particles through the SEM, TEM, VSM measurement. At the same time, we discussed the effect to the morphologies of different iron source precursor, different reaction times as well as sodium acetate and capping agent, and then on this basis, a the possible formation mechanism is presented.2. Without using any organic addictives, We have successfully preparated peanut-shaped, hemispheres mesocrystal ZnO in a solvothermal reaction system with ethylene glycol and ethanolamine as a mixsure solution and Zn(NO3)3 as Zn sources. the mesocrystal materials have roughness surface and a large surface area, which may be used in catalysis and built other suprastructural materials.3. By introducing ultrasound and high concentrations of NaOH/DEG solution to the classic Stober system, Several novel morphology SiO2 micro-and nanomaterials with the help of "ultrasonic cavitation effect" and etching effect of NaOH. We further prepared flower-shaped, square tube, dendritic structure by adjusting the ultrasonic power and NaOH/DEG concentration, these novel structures combined with the unique physical and chemical properties of SiO2 may be used in surface-enhanced Ramans (SERS), microfluidic field.