Development of one-dimensional nanostructures through the crystallization of amorphous colloids.
Development of one-dimensional nanostructures through the crystallization of amorphous colloids.
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DOI：
10.1016/j.jcis.2003.12.018
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发表时间：
2004-05
影响因子：
9.9
通讯作者：
Xu Cao;Ling-Li Li-Ling-Li-Li-47681414;Yi Xie
中科院分区：
文献类型：
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作者：
Xu Cao;Ling-Li Li-Ling-Li-Li-47681414;Yi Xie
在本文中，我们已经证明了非晶胶体的晶化方法是方便和可行的，在大规模生产的一维（1D）纳米结构。对于具有高度各向异性结构的晶体，例如正交晶体、三方晶体和六方晶体，结晶通常倾向于沿沿着（001）轴发生。以正交晶系硫化铋（Bi 2S 3）纳米棒和三角晶系硒（t-Se）纳米线的晶化制备为例，阐述了晶化的过程和机理。用透射电子显微镜、场发射扫描电子显微镜、X射线衍射仪和选区电子衍射仪对产物进行了表征。此外，通过研究中间产物的形貌和结构，研究了非晶态Bi 2S 3胶体晶化过程中晶体生长的详细过程。结果表明，纳米棒的生长是通过两个关键步骤完成的：（1）在球形Bi 2S 3胶体表面形成多个活性点;（2）随后沿这些活性点沿着择优生长。
In this paper we have demonstrated that the crystallization method of amorphous colloids is convenient and feasible in the large-scale production of one-dimensional (1D) nanostructures. For the crystals with highly anisotropic structures, such as orthorhombic, trigonal, and hexagonal crystals, the crystallization generally tends to occur along the (001) axis. The preparation of orthorhombic bismuth sulfide (Bi2S3) nanorods and trigonal selenium (t-Se) nanowires by the crystallization route was used as typical examples to illustrate the process and mechanism of crystallization. The as-prepared products were characterized with transmission electron microscopy, field-emission scanning electron microscopy, X-ray diffraction, and selected area electron diffraction. Additionally, the detailed crystal growth processes involved in the crystallization of amorphous Bi2S3colloid were investigated by studying the morphology and structure of intermediates. It demonstrates that the growth of the nanorods is through two key steps: (1) the formation of multiple activated sites on the surface of spherical Bi2S3colloid and (2) the subsequent preferential growth along these sites.