Cu_2O及Au/Cu_2O核壳异质结纳米立方体的制备、微观结构和生长机理的研究

Preparation,microstructure and formation mechanism of Cu_2O and Au-Cu_2O core-shell nanocube heterostructures

采用液相还原法制备出金纳米颗粒,并通过调控其浓度,采用热氧化的方法制备出了氧化亚铜纳米立方体及金/氧化亚铜核壳异质结纳米立方体。利用透射电子显微学对两种材料的结构及物相组成等进行了详细的分析研究,并探讨了各自的形成机理。研究发现Cu2O纳米立方体主要有正方体和截角正八面体两种几何形状。Au/Cu2O核壳异质结纳米立方体有两种形成机制。Au纳米颗粒和正四辛基溴化铵的浓度对于两种纳米立方体结构的形成起着重要的作用。

Gold nanoparticles were synthesized via a liquid phase reduction method.By adjusting the concentration of gold nanoparticles,Cu2O nanocubes and Au-Cu2O core-shell nanocube heterostructures were produced using a thermal oxidation method.Transmission electron microscopy was used to investigate the structure and chemical composition of the materials.Based on the experimental results,the formation mechanisms for Cu2O nanocubes and Au-Cu2O core-shell nanocube heterostructures were proposed.Cu2O nanocubes have two main geometrical shapes,one being a perfect cube,and the other being a truncated cube.Au-Cu2O core-shell nanocube heterostructures have two kinds of formation mechanisms.The concentration of gold nanoparticles and tetraoctylammonium bromide play an important role in the formation process of the two kinds of nanocube.