Multi-layer core shell structure CeO2 nanometer hollow sphere template-free composite method

Abstract

The invention discloses a multi-layer core shell structure CeO2 nanometer hollow sphere template-free composite method. The method includes the steps that firstly, cerous nitrate and pyridine-2,5-dicarboxylic acid are dissolved in an absolute ethyl alcohol and DMF mixed solvent; then the mixed solution is placed in a reaction kettle, reaction is conducted for 6-12 hours at the temperature of 100 DEG C to 160 DEG C, centrifugal washing is conducted after reaction is conducted, and coordination polymer nano solid spheres of cerium are obtained after the mixture is dried at 80 DEG C; finally, the obtained dried samples are placed in a muffle furnace, roasting is conducted for 1-4 hours at the temperature of 400 DEG C to 800 DEG C, and the multi-layer core shell structure CeO2 hollow spheres are obtained after the mixture is cooled to the room temperature. The method is simple in synthesis procedures and capable of conducting accurate control over the number of core shells, the thickness and the like; the average grain size of the synthetic multi-layer core shell structure CeO2 nanometer hollow spheres is 400 nm, distribution is even, most spheres are composed of three hollow sphere shells and one hollow sphere core, and the obtained material structure is stable. The method provides a new way for synthesis of ceria of a complex core-shell structure.

Description

technical field [0001] The invention relates to a multilayer core-shell structure CeO 2 Template-free synthesis of hollow nanospheres. Background technique [0002] Due to their unique physical and chemical properties, rare earth coordination polymers have shown good potential application value in the fields of light, electricity, magnetism, catalysis, and gas storage, so they have attracted much attention from researchers. At present, research centers in this field are mainly focused on synthesizing coordination polymers with unique structures by simple and novel methods. Its special coordination mode and crystal structure are very likely to make materials have special properties and expand the application space of materials. In the research of various rare earth materials, the preparation and application of rare earth oxides have always been the key research objects. It is also one of the focuses of current research to control the properties and applications of rare eart...

AI Technical Summary

Problems solved by technology

Materials of this structure, the hard template method and the soft template method used in the traditional synthesis of the multi-shell structure have the characteristics of cumbersome steps and low synthesis efficiency. Some progress has been made in this area in the past two years, but the template-free method Synthesizing core-shell structures remains a challenge

Literature [Nanoscale,2012,4(21):6835-6840] using cerium nitrate as metal ion, 1,3-adamantanedicarboxylic acid and 2-aminoterephthalic acid as ligands, using simple solvothermal synthesis smooth coordination polymer solid microspheres, followed by a simple one-step calcination to prepare CeO with a core-shell structure 2 ; However, it cannot control the number of layers, thickness, etc. of the core-shell structure, and the cost of the ligand used is relatively high

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