Effects of surface defects on the mechanical properties of ZnO nanowires

The elastic modulus of ZnO nanowires was measured using a resonance method based on laser Doppler effect and their fracture strains were determined via two-point bending with the aid of optical nanomanipulation. The elastic moduli of ZnO nanowires with diameters of 78 to 310 nm vary from 123 to 154 ...

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Published in:Scientific reports 2017-08, Vol.7 (1), p.9547-8, Article 9547
Main Authors: Roy, Aditi, Mead, James, Wang, Shiliang, Huang, Han
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Language:English
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639/301/357/1016
639/925/357/1016
Defects
Doppler effect
Fractures
Humanities and Social Sciences
Mechanical properties
multidisciplinary
Nanotechnology
Science
Science (multidisciplinary)
Statistical analysis
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Wang, Shiliang
Huang, Han
description The elastic modulus of ZnO nanowires was measured using a resonance method based on laser Doppler effect and their fracture strains were determined via two-point bending with the aid of optical nanomanipulation. The elastic moduli of ZnO nanowires with diameters of 78 to 310 nm vary from 123 to 154 GPa, which are close to the bulk value of 140 GPa and independent of the diameters and surface defects. However, the fracture strains of the ZnO nanowires depend significantly on their diameters, increasing from 2.1% to 6.0% with the decrease in diameter from 316 to 114 nm. Post-mortem TEM analysis of the ends of the fractured nanowires revealed that fracture initiated at surface defects. The Weibull statistical analysis demonstrated that a greater defect depth led to a smaller fracture strain. The surface-defect dominated fracture should be an important consideration for the design and application of nanowire-based nanoelectromechanical systems.
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subjects 639/301/357/1016
639/925/357/1016
Defects
Doppler effect
Fractures
Humanities and Social Sciences
Mechanical properties
multidisciplinary
Nanotechnology
Science
Science (multidisciplinary)
Statistical analysis
title Effects of surface defects on the mechanical properties of ZnO nanowires
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