Hao Yufeng, Meng Guowen, Ye Changhui, Zhang Xueru, Zhang Lide
Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.
J Phys Chem B. 2005 Jun 9;109(22):11204-8. doi: 10.1021/jp050545l.
Orthogonally branched single-crystalline magnesium oxide nanostructures were synthesized through a simple chemical vapor transport and condensation process in a flowing Ar/O(2) atmosphere. Other morphologies, such as cubes and nanowires, can also be obtained under different controlled conditions. The formation of different types of nanostructures can be tuned by modifying oxygen partial pressure during the synthesis. All the nanostructures are cubic single-crystalline enclosed by low-index {100} facets. Growth mechanisms for the nanostructures are discussed in detail: different supersaturation ratios, relatively high substrate temperatures, and surface defects in certain crystallographic planes cooperatively take important effects on determining the product morphologies. Structural defect-related blue light emission of the three types of MgO nanostructures was investigated. The MgO nanostructures with abundant morphologies may find applications in various nanodevices, and the kinetics-driven methodology might be exploited to synthesize similar nanostructures of other functional oxide materials.
通过在流动的氩气/氧气气氛中进行简单的化学气相传输和冷凝过程，合成了正交分支的单晶氧化镁纳米结构。在不同的控制条件下，还可以获得其他形态，如立方体和纳米线。通过在合成过程中改变氧分压，可以调节不同类型纳米结构的形成。所有纳米结构均为立方单晶，由低指数{100}面所包围。详细讨论了纳米结构的生长机制：不同的过饱和比、相对较高的衬底温度以及某些晶面中的表面缺陷共同对确定产物形态起着重要作用。研究了三种类型氧化镁纳米结构与结构缺陷相关的蓝光发射。具有丰富形态的氧化镁纳米结构可能在各种纳米器件中找到应用，并且动力学驱动方法可能被用于合成其他功能氧化物材料的类似纳米结构。
