期刊
NANO LETTERS
卷 12, 期 2, 页码 704-708出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl2036172
关键词
Surface structure; relaxation; ZnO; transmission electron microscopy; electromechanical properties
类别
资金
- National 973 Project of China [2009CB623700]
- National Natural Science Foundation of China [50831001]
Relaxation is a most basic structural behavior of free surfaces, however, direct observation of surface relaxation remains challenging in atomic-scale. Herein, single-crystalline nanoislands formed in situ on ZnO nanowires and nanobelts are characterized using aberration-corrected transmission electron microscopy combined with ab initio calculations. For the first time, displacements of both Zn and O atoms in the fresh (10 (1) over bar0) facets are quantified to accuracies of several picometers and the under-surface distributions of contractions and rotations of Zn-O bonds are directly measured, which unambiguously verify the theoretically predicted relaxation of ZnO (10 (1) over bar0) free surfaces. Finally, the surface relaxation is directly correlated with the size effects of electromechanical properties (e.g., elastic modulus and spontaneous polarization) in ZnO nanowires.
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