Morphology-dependent stimulated emission and field emission of ordered CdS nanostructure arrays.
Morphology-dependent stimulated emission and field emission of ordered CdS nanostructure arrays.
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DOI：
10.1021/nn800895k
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发表时间：
2009-03
期刊：
影响因子：
17.1
通讯作者：
T. Zhai;X. Fang;Y. Bando;Qing Liao;Xijin Xu;H. Zeng;Ying Ma;J. Yao;D. Golberg
中科院分区：
文献类型：
--
作者：
T. Zhai;X. Fang;Y. Bando;Qing Liao;Xijin Xu;H. Zeng;Ying Ma;J. Yao;D. Golberg
通过简单的两步金属-有机化学气相沉积工艺成功地制备了高度有序的硫化镉纳米结构阵列。我们进行了受激发射和场发射测量，试图了解五种有序的硫化镉纳米结构阵列(排列良好的截短纳米锥、纳米棒、裂隙纳米棒、准排列纳米线和纳米线)的形貌、排列和发射性能之间的关系。不同类型的一维硫化镉纳米结构在受激和场发射性能上表现出明显的差异。受激辐射与结构取向有很强的相关性：取向越好，阈值越低。取向和长径比对场发射性能都有很大的影响，长径比越大，取向越好的硫化镉发光体的场发射性能越好。因此，定向良好的硫化镉纳米棒阵列具有较低的受激发射阈值，准定向纳米线阵列具有较高的场发射电流和较低的开启电场。
Highly ordered CdS nanostructure arrays were successfully fabricated via a simple two-step metal-organic chemical vapor deposition process. Both stimulated emission and field-emission measurements were carried out in an attempt to understand the correlation between the morphologies, alignments, and emission performances of five ordered CdS nanostructure array types (well-aligned truncated nanocones, nanorods, cleft nanorods, quasi-aligned nanowires, and nanowires). The 1D CdS nanostructures of various types displayed notable differences in stimulated and field-emission performances. The stimulated emission strongly correlated with the structure alignment: the better the alignment, the lower the threshold. Both of the alignments and aspect ratios greatly affected the field-emission properties; the CdS emitters of higher aspect ratio and better alignment exhibited better field-emission performance. Thus the well-aligned CdS nanorod arrays had the lower threshold for stimulated emission, and quasi-aligned nanowire arrays produced the higher field-emission current and possessed the lower turn-on fields.