Synthesis And Characterization Of CeO₂@Au Core-Shell Structured Nanoparticles

Core-shell nanoparticles is a new kind of materials studied extensively in recent years because of their unique optical, electric, magnetic, catalytic and micromechanical properties, which are substantially different from those of mono-component particles. As attractive building blocks of advanced functional materials, core-shell nanoparticles have important applications in such areas as photonic band gap materials, microwave absorbing materials, electrorheological (or magnetorhelogical) fluids, the synthesis of a composite semiconductor, controllable release or protection of bioactive substances, controllable catalysis, and nanoreactor or nanoseparator, etc. CeO₂@Au core-shell nanoparticles is an important catalyst and widely used in water-gas shift reaction and direct methanol fuel cells. In this dissertation, nanoparticles of CeO₂ were prepared by solid-state reaction at room temperature method, precipitation method and colloidal chemistry method. The effect factors on CeO₂ nanoparticles were analysed. CeO₂@Au nanoparticles were preliminarily obtained by chemical reduction. The effect factors on CeO₂@Au nanoparticles were discussed preliminarily.The prepared samples were deeply investingated by XRD, TEM, TG-DTA, UV-Vis, FTIR, SEM. Some significant new results were obtained and laid a foundation for further investigation of the properties and application of CeO₂@Au structured core-shell nanoparticles.