Size-induced elastic stiffening of ZnO nanostructures: Skin-depth energy pinning

被引：60
|
作者：
Liu, X. J. [1 ,2 ]
Li, J. W. [1 ,2 ]
Zhou, Z. F. [1 ,2 ]
Yang, L. W. [1 ,2 ]
Ma, Z. S. [1 ,2 ]
Xie, G. F. [1 ,2 ]
Pan, Y. [1 ,2 ]
Sun, Chang Q. [1 ,2 ,3 ]
机构：
[1] Xiangtan Univ, Minist Educ, Fac Mat Optoelect & Phys, Xiangtan 411105, Hunan, Peoples R China
[2] Xiangtan Univ, Minist Educ, Key Lab Low Dimens Mat & Applicat Technol, Xiangtan 411105, Hunan, Peoples R China
[3] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
来源：
APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 13期
基金：
中国国家自然科学基金;
关键词：
bonds (chemical); elastic moduli; elasticity; nanostructured materials; size effect; zinc compounds; DEPENDENCE;
D O I：
10.1063/1.3109786
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
It has long been puzzling regarding the trends and physical origins of the size-effect on the elasticity of ZnO nanostructures. An extension of the atomic "coordination-radius" correlation premise of Pauling and Goldschmidt to energy domain has enabled us to clarify that the elastic modulus is intrinsically proportional to the sum of bond energy per unit volume and that the size-induced elastic stiffening arises from (i) the broken-bond-induced local strain and skin-depth energy pinning and (ii) the tunable fraction of bonds between the undercoordinated atoms, and therefore, the elastic modulus of ZnO nanostructures should increase with the inverse of feature size.
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页数：3
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