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Nano Lett. 2019 Jul 10;19(7):4490-4497. doi: 10.1021/acs.nanolett.9b01300. Epub 2019 Jun 17.

Mechanical Behavior of InP Twinning Superlattice Nanowires.

Author information

1
State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering , Central South University , Changsha , Hunan 410083 , P.R. China.
2
IMDEA Materials Institute , C/Eric Kandel 2 , 28906 Getafe, Madrid , Spain.
3
Hunan Key Laboratory for Supermicrostructure and Ultrafast Process, School of Physics and Electronics , Central South University , Changsha , Hunan 410083 , P.R. China.
4
Department of Electronic Materials Engineering, Research School of Physics and Engineering , The Australian National University , Canberra , Australian Capital Territory 0200 , Australia.
5
Department of Materials Science , Polytechnic University of Madrid , E.T.S. de Ingenieros de Caminos, 28040 Madrid , Spain.

Abstract

Taper-free InP twinning superlattice (TSL) nanowires with an average twin spacing of ∼13 nm were grown along the zinc-blende close-packed [111] direction using metalorganic vapor phase epitaxy. The mechanical properties and fracture mechanisms of individual InP TSL nanowires in tension were ascertained by means of in situ uniaxial tensile tests in a transmission electron microscope. The elastic modulus, failure strain, and tensile strength along the [111] direction were determined. No evidence of inelastic deformation mechanisms was found before fracture, which took place in a brittle manner along the twin boundary. The experimental results were supported by molecular dynamics simulations of the tensile deformation of the nanowires that also showed that the fracture of twinned nanowires occurred in the absence of inelastic deformation mechanisms by the propagation of a crack from the nanowire surface along the twin boundary.

KEYWORDS:

transmission electron microscope mechanical test; InP nanowires; Twinning superlattice; fracture behavior; molecular dynamics

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