Fracture and buckling of piezoelectric nanowires subject to an electric field

Fracture and buckling are major failure modes of thin and long nanowires (NWs), which could be affected significantly by an electric field when piezoelectricity is involved in the NWs. This paper aims to examine the issue based on the molecular dynamics simulations, where the gallium nitride (GaN) N...

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Bibliographic Details
Published inJournal of applied physics Vol. 114; no. 17
Main Authors Zhang, Jin, Wang, Chengyuan, Adhikari, Sondipon
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 07.11.2013
Subjects
Applied physics
BEAMS
BUCKLING
Computer simulation
ELECTRIC FIELDS
Failure modes
FRACTURE PROPERTIES
Fracture strength
GALLIUM NITRIDES
MATERIALS SCIENCE
Molecular dynamics
MOLECULAR DYNAMICS METHOD
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
Nanowires
PIEZOELECTRICITY
QUANTUM WIRES
SIMULATION
STRAINS
THERMAL FRACTURES
THERMAL STRESSES
Timoshenko beams
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Summary:Fracture and buckling are major failure modes of thin and long nanowires (NWs), which could be affected significantly by an electric field when piezoelectricity is involved in the NWs. This paper aims to examine the issue based on the molecular dynamics simulations, where the gallium nitride (GaN) NWs are taken as an example. The results show that the influence of the electric field is strong for the fracture and the critical buckling strains, detectable for the fracture strength but almost negligible for the critical buckling stress. In addition, the reversed effects are achieved for the fracture and the critical buckling strains. Subsequently, the Timoshenko beam model is utilized to account for the effect of the electric field on the axial buckling of the GaN NWs, where nonlocal effect is observed and characterized by the nonlocal coefficient e0a=1.1 nm. The results show that the fracture and buckling of piezoelectric NWs can be controlled by applying an electric field.
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ISSN:0021-8979
1089-7550
DOI:10.1063/1.4829277