Preparation And Characterization Of Core-shell Nano Composite Oxides

Due to the sizes and structures, core-shell materials pocess unique physical and chemical properties in numerous hybrid materials, which attract several scholars’attention in recent years. The properties of core-shell materials can be changed by being adjusted the sizes and shapes using in the fields of medical science, catalysis and electrodes for batteries. The methods for preparing core-shell materials include hydrothermal method, solvothermal method, physical vapor deposition method and sol-gel method. It is difficult for core-shell materials to pocess uniform structure and good dispersibility using these methods. Therefor, to find an effective method has been the goal of scientific workers in the field.In this article,3DOM Fe2O3、NiO and Mn2O3 membrane were synthesised by Polystyrene (PS) colloidal crystal template. From the results of SEM, the PS colloidal spheres had good monodispersed and an average diameter.3DOM Fe2O3、NiO and Mn2O3 had well-ordered periodicity and homogeneous pore diameters.3DOM Fe2O3、NiO and Mn2O3 had excellent periodic and well-ordered structure.Then,3DOM Mn2O3@Fe2O3、3DOM NiO@Fe2O3、3DOM Mn2O3@NiO and 3DOM NiO@Mn2O3 were prepared by sol-gel method. The results of SEM、TEM and EDS indicated the relationships of concentrations of precursors and the morphology and the molar ratio of core and shell. It can be got that the core-shell materials prepared had uniform structure and good dispersibility. And the shell thickness and the molar ratio of core and shell increased with the rising of concentrations of precursors. Therefore, the properties and functions of the prepared materials can be controlled by changing the concentrations of precursors, which can be the theoretical basis for the later applications.Finally, the thermal decomposition effects of 3DOM NiO@Fe2O3 on AP were studied by DSC. It can be found that with the increasing of NiO shell, the catalysis effects of 3DOM NiO@, Fe2O3 on AP were improved.