Hydrothermal Synthesis And Characterization Of Metal Oxides Nanostructures

In recent years, nanomaterials with novel nanostructures have attracted significant attention. In this paper ,we used hydrothermal method under low temperature, designed many different solution chemical route, and synthesized Fe2O3 and ZnO nanomaterials with different morphologies. The metal oxide have been characterized and analyzed. And in base of the crystal grow condition, the crystal grow orientation and crystal grow mechanisms of the metal oxide have been discussed. The main work of this paper as following:1.By a low-temperature hydrothermal method, different morphological Fe2O3 nanocrystals have been successfully fabricated under the surfactant assistance. The samples were characterized by field emission scanning electron microscopy, energy-dispersive x-ray spectroscopy. Fe2O3 various nanostructures morphologies have been obtained by changing the conditions of the system. The reasons which affect nanostructures have been analyzed ,and finally a possible crystal grow mechanisms have been discussed.2. In the hydrothermal system,α-Fe2O3 hollow nanospheres were successfully prepared by using SiO2 nanospheres as templates. This is a simple, effective method for fabricating hollow-spheres. The hollow nano-spheres were characterized by IR spectrum, X-raydiffraction (XRD) analysis, (SEM) images, transmission electronmicroscope (TEM) and EDAX. The hollow nanospheres were disperse, the size of the hollow nanospheres ranges from 300 to 350 nm, and the shell thickness is sbout 50 nm. The inner diameters ofα-Fe2O3 hollow nanospheres were similar to the diameter of the silica microspheres. Finally , a possible crystal grow mechanisms have been discussed.3. Large-scale ZnO nanospheres were successfully synthesized via a low-temperature hydrothermal process. In this process, TEA was the ligands and CO(NH)2 was the dispersant. The samples were characterized by SEM images, XRD analysis, IR, EDAX. The results revealed that TEA played a crucial role in determining the shape of the samples. And the existence of CO(NH)2 was important to the surface of nanospheres. The affect of the react-time, temperature for the nanostures have been researched. We also investigated optical properties of the samples by PL spectroscopy. At last, we proposed a possible formation mechanism.