使用原子力显微镜和纳米压痕技术测量的ZnO纳米带的杨氏模量。

Young's modulus of ZnO nanobelts measured using atomic force microscopy and nanoindentation techniques.

作者信息

Ni Hai, Li Xiaodong

机构信息

Department of Mechanical Engineering, University of South Carolina, 300 Main Street, Columbia, SC 29208, USA.

出版信息

Nanotechnology. 2006 Jul 28;17(14):3591-7. doi: 10.1088/0957-4484/17/14/039. Epub 2006 Jun 26.

DOI:10.1088/0957-4484/17/14/039

PMID:19661610

Abstract

The bending Young's modulus of ZnO nanobelts was measured by performing three-point bending tests directly on individual nanobelts with an atomic force microscope (AFM). The surface-to-volume ratio has no effect on the bending Young's modulus of the ZnO nanobelts for surface-to-volume ratios ranging from 0.017 to 0.035 nm(2) nm(-3), with a belt size of 50-140 nm in thickness and 270-700 nm in width. The bending Young's modulus was measured to be 38.2 +/- 1.8 GPa, which is about 20% higher than the nanoindentation Young's modulus of 31.1 +/- 1.3 GPa. The ZnO nanobelts exhibit brittle fracture failure in bending but some plastic deformation in indentation.

摘要

通过使用原子力显微镜（AFM）直接对单个纳米带进行三点弯曲测试，测量了ZnO纳米带的弯曲杨氏模量。对于厚度为50 - 140 nm、宽度为270 - 700 nm的纳米带，当表面体积比在0.017至0.035 nm² nm⁻³范围内时，表面体积比对ZnO纳米带的弯曲杨氏模量没有影响。测得弯曲杨氏模量为38.2±1.8 GPa，比纳米压痕杨氏模量31.1±1.3 GPa高约20%。ZnO纳米带在弯曲时表现出脆性断裂失效，但在压痕时有一些塑性变形。