Structural investigations of copper nanorods by high-resolution TEM
Structural investigations of copper nanorods by high-resolution TEM
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DOI：
10.1103/physrevb.61.4968
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发表时间：
2000-02-15
影响因子：
3.7
通讯作者：
Urban, J
中科院分区：
文献类型：
--
作者：
Lisiecki, I;Filankembo, A;Urban, J
通过铜化合物的还原制备了具有1 μ m量级的长度和几个纳米的直径的定义明确的长Cu棒。沉积在非晶碳膜上后，进行高分辨率透射电子显微镜和电子衍射，以解释棒的结构。通过应用计算机模拟与多层计算，得到的颗粒结构。棒被认为是具有五重对称性的截顶十面体。可以表明，大多数颗粒相对于活变形四面体亚单元之一的基底在[001]方向上取向，即，五重轴通常平行于衬底的表面。还证明了含有堆垛层错的Cu fee体结构必须被排除作为可能的结构模型。此外，截顶二十面体结构或具有额外中间平面的二十面体并不能解释实验过程。二十面体通常与十面体结构一起观察到具有球形形态的颗粒。由于表面活性剂的存在，只有在十面体的五重轴的方向上的增长是可能的，导致长针状杆。
Well-defined long Cu rods having a length of the order of 1 mu m and diameters of several nanometers were prepared by reduction of copper compounds. After deposition on amorphous carbon films, high-resolution transmission electron microscopy and electron diffraction were performed in order to explain the structure of the rods. By applying computer simulations with multislice calculations, the particle structure was obtained. The rods were held to be truncated decahedra with a fivefold symmetry. It could be shown that most particles were oriented in the [001] direction with respect to the substrate for one of the live deformed tetrahedral subunits, i.e., the fivefold axis very often was parallel to the surface of the substrate. It was also proven that the Cu fee bulk structure containing stacking faults had to be excluded as a possible structural model. Also, truncated icosahedral structures or icosahedra with additional intermediate planes did not serve to explain the experimental process. Icosahedra are often observed together with decahedral structures for particles with a spherical-like morphology. Due to the presence of surfactant, only growth in the direction of the fivefold axis of decahedra was possible, resulting in long needlelike rods.