6-Fold-Symmetrical AlN Hierarchical Nanostructures: Synthesis and Field-Emission Properties
6-Fold-Symmetrical AlN Hierarchical Nanostructures: Synthesis and Field-Emission Properties
复制标题
6 重对称 AlN 分级纳米结构：合成和场发射性能
DOI：
10.1021/jp811484r
复制
发表时间：
2009-03-12
影响因子：
3.7
通讯作者：
Zhu, Jianmin
中科院分区：
文献类型：
--
作者：
Zhang, Fan;Wu, Qiang;Zhu, Jianmin
由于纳米材料具有形状相关的性质，因此具有独特形貌和尺寸的纳米材料的可控合成引起了人们越来越大的兴趣。本文报道了通过AlCl3与NH3的化学反应，在AlCl3的汽化温度为120~165℃，反应温度高于1050℃的条件下，通过改变AlN纳米针的反应温度和AlCl3的蒸气压，可以控制AlN纳米结构的形貌、尺寸和密度，从而合成了由AlN纳米针组装的六重对称的AlN纳米结构。根据AlCl3蒸汽压的变化和中间产物的形态演变，讨论了AlN分级纳米结构的形成机理。观察到了AlN产物的形状依赖性质，与花状相比，乌尔尼状纳米结构表现出更好的光学和场发射性能。这些结果表明，六重对称的AlN分级纳米结构在光电子器件和场发射器件中具有潜在的应用前景。
The controllable synthesis of nanomaterials with unique morphologies and sizes has attracted increasing interest because of the shape-dependent properties of the nanomaterials. In this article, we report the synthesis of the new 6-fold-symmetrical AlN hierarchical nanostructures including urchinlike and flowerlike ones assembled by AlN nanoneedles through the chemical reaction between AlCl3 and NH3 with the vaporization temperature of AlCl3 between 120 and 165 C and the reaction temperature higher than 1050 C. The morphologies, sizes, and densities of the AlN nanostructures could be controllably modulated by changing the reaction temperature and the vapor pressure of AlCl3. The formation mechanism of the AlN hierarchical nanostructures has been discussed on the basis of the change in the AlCl3 vapor pressure and the morphological evolution of the intermediate products. The shape-dependent properties of the AlN products have been observed, and the urchinlike nanostructures showed better optical and field-emission properties in comparison with the flowerlike ones. These results indicate the potential applications of the 6-fold-symmetrical AlN hierarchical nanostructures in optoelectronic and field-emission devices.