具有五重对称性的银纳米棒的结构特性

Structural properties of silver nanorods with fivefold symmetry.

作者信息

Chen Hanyuan, Gao Yan, Yu Hongchun, Zhang Huairou, Liu Libao, Shi Youguo, Tian Huanfang, Xie Sishen, Li Jianqi

机构信息

Beijing Laboratory of Electron Microscopy, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China.

出版信息

Micron. 2004;35(6):469-74. doi: 10.1016/j.micron.2004.02.008.

DOI:10.1016/j.micron.2004.02.008

PMID:15120132

Abstract

The microstructural features of silver nanorods with the average length of 50 microm and diameters of around 100 nm have been investigated by means of SEM, X-ray diffraction, and transmission-electron microscopy (TEM). Silver nanorods in general have a pentagonal shape with a remarkable fivefold symmetry as revealed in cross-section observations. The fivefold axis, i.e. the growth direction, normally goes along the [110]-zone axis direction of the basic fcc Ag-structure. The twinning relationships and relevant twin boundaries among the five subunits in the pentagonal nanorod have been examined by high-resolution TEM and selected-area electron diffraction. Defects and stacking faults in this kind of nanorods have been briefly analyzed.

摘要

通过扫描电子显微镜（SEM）、X射线衍射和透射电子显微镜（TEM）研究了平均长度为50微米、直径约为100纳米的银纳米棒的微观结构特征。如横截面观察所示，银纳米棒通常呈五边形，具有显著的五次对称性。五次轴，即生长方向，通常沿着基本面心立方银结构的[110]晶带轴方向。通过高分辨率TEM和选区电子衍射研究了五边形纳米棒中五个亚单元之间的孪晶关系和相关孪晶界。简要分析了这类纳米棒中的缺陷和堆垛层错。