School of science, Minzu University of China, Beijing 100081, People's Republic of China.
Nanoscale. 2012 Oct 21;4(20):6389-92. doi: 10.1039/c2nr31799k.
Systematic structural characterization using high resolution transmission electron microscope (HRTEM), selected area electron diffraction (SAED) and diffractogram analysis of silver nanorice was aimed to reveal the characteristic features of twins and stacking faults, faceting effect and smoothing phenomena of outer surfaces. Nucleation, growth and crystallization of new nanocrystals, and depletion of parent nanorice was observed by the in situ TEM through electron-beam irradiation. It can be seen that the fundamental growth mechanism of the new nucleus is Ag atom diffusion or migration through carbon film supported these crystals. Twins in the as-grown nanorice is a reflection twin with {111} lattice plane as the common plane, and they are formed by 120° or 60° rotation about the reference twin lamella. Shockley partial dislocation was formed by the {111} lattice plane shifting along the <112> direction with the Burgers vector a/6 <112>. Twin faults occur in the form of adjacent twin lamellas inserted into a single atomic plane. Growth morphology analysis suggests that {111} and {001} lattice planes with the minimum surface attachment energy have a tendency to facet.
采用高分辨率透射电子显微镜（HRTEM）、选区电子衍射（SAED）和衍射图谱分析对银纳米稻穗进行系统的结构表征，旨在揭示孪晶和位错、表面成核和光滑现象的特征。通过电子束辐照的原位 TEM 观察到新纳米晶体的成核、生长和结晶以及母纳米稻穗的耗尽。可以看出，新核的基本生长机制是 Ag 原子通过碳膜支撑这些晶体的扩散或迁移。生长过程中的孪晶是具有{111}晶格平面的反映孪晶，它们是通过参考孪晶层的 120°或 60°旋转形成的。肖克利部分位错是由{111}晶格平面沿<112>方向以 Burgers 矢量 a/6 <112>移动形成的。孪晶位错以相邻孪晶层插入单个原子平面的形式发生。生长形态分析表明，具有最小表面附着能的{111}和{001}晶格平面有形成晶面的趋势。
