Structure and shape transformation from multiply twinned particles to epitaxial nanocrystals: Importance of interface on the structure of Ag nanoparticles

被引：25

作者：

Li, BQ ^{[1
]}

Zuo, JM

机构：

[1] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA

[2] Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 08期

关键词：

D O I：

10.1103/PhysRevB.72.085434

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of a substrate on the structure of nanometer-sized metal particles was investigated for Ag on silicon surfaces by using high-resolution transmission electron microscope and electron diffraction. The nanometer-sized Ag particles, formed by the vapor deposition of Ag on (001) hydrogen-terminated Si (H-Si) surfaces at room temperature, adopt multiply twinned structures. Upon annealing, the multiply twinned Ag nanoparticles on H-Si (001) transform into fcc nanocrystals. The fcc Ag takes up the cube-on-cube epitaxy, with the orientation relationship of Ag(001)//Si(001) and Ag [110]//Si [110]. An energetic model is developed to account for the structure and shape transition of supported multiply twinned particles to fcc epitaxial nanocrystals. Possible transition mechanisms are discussed.

引用

页数：7

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