Flower-shaped ZnO nanostructures obtained by cyclic feeding chemical vapour deposition: structural and optical properties
Flower-shaped ZnO nanostructures obtained by cyclic feeding chemical vapour deposition: structural and optical properties
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DOI：
10.1088/0957-4484/16/10/079
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发表时间：
2005-10
期刊：
影响因子：
3.5
通讯作者：
A. Umar;S. Lee;Y. Im;Y. Hahn
中科院分区：
文献类型：
--
作者：
A. Umar;S. Lee;Y. Im;Y. Hahn
在不使用金属催化剂的情况下，通过循环进料化学气相沉积在Si（100）和Si（111）衬底上生长了花状ZnO纳米结构。在Si（100）衬底上获得的结构表现出三角形叶片，其长度和直径分别在300-400和90-130 nm范围内。在Si（111）衬底上生长的花形结构上观察到具有源自一个中心的六边形小平面的均匀形状的叶。透射电子显微镜和选区电子衍射图案表明，这些结构是高度结晶，与纤锌矿六方相，并优先在c轴方向取向。与生长在Au涂层硅衬底上的星形ZnO纳米结构不同，花状纳米结构在378 nm处显示出尖锐而强的紫外发射，在520 nm处显示出宽而弱的绿色发射，表明其晶体质量良好，结构缺陷少。
Flower-shaped ZnO nanostructures were grown on Si(100) and Si(111) substrates by cyclic feeding chemical vapour deposition without the use of a metal catalyst. The structures obtained on the Si(100) substrate exhibited triangle-shaped leaves with lengths and diameters in the ranges 300–400 and 90–130 nm, respectively. Uniformly shaped leaves with hexagonal facets originating from one centre were observed on the flower-shaped structures grown on the Si(111) substrate. Transmission electron microscopy and selected area electron diffraction patterns showed that these structures are highly crystalline, with the wurtzite hexagonal phase, and preferentially oriented in the c-axis direction. Unlike star-shaped ZnO nanostructures grown on Au-coated silicon substrates, the flower-shaped nanostructures showed sharp and strong UV emission at 378 nm and broad and weak green emission at 520 nm, indicating a good crystal quality and few structural defects.