1纳米银团簇的结构

S. Giorgio, J. Urban
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引用次数: 14

摘要

用电子显微镜研究了小银团簇。粒径为1 ~ 2 nm和4 ~ 8 nm的颗粒形成了双峰分布。在最大的粒子中,二十面体和三面体在HREM中出现的频率相同。然而,1纳米大小的二十面体却找不到,而这种尺寸的立方面体却可以分辨出来。对这两种结构的高分辨率图像进行计算机模拟表明,在实验条件下,二十面体更难分辨。对于1 nm的粒子,可以测量到晶格参数约5%的膨胀。对于2nm颗粒,与大于3nm颗粒的体积值相比,该膨胀率降至2.5%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Structure of 1 nm silver clusters
Small silver clusters have been investigated by electron microscopy. A bimodal size distribution is formed containing particles of diameter 1-2 nm and 4-8 nm. Among the largest particles icosahedra and cuboctahedra appear with equal frequency in HREM. 1 nm size icosahedra, however, could not be found, while cuboctahedra of this size could be resolved. Computer simulations of high resolution images for both structures reveal that icosahedra are more difficult to resolve under the experimental conditions. A dilation of approximately 5% of the lattice parameter could be measured for 1 nm particles. For 2 nm particles, this dilation drops to 2.5% compared with the bulk value of the particles larger than 3 nm.
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