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Mechanical behavior of InP twinning superlattice nanowires.

Research paper by Zhilin Z Liu, Ioannis I Papadimitriou, Miguel M Castillo-Rodríguez, Chuanyun C Wang, Gustavo G Esteban-Manzanares, Xiaoming X Yuan, Hark Hoe HH Tan, Jon Mikel JM Molina-Aldareguia, Javier J LLorca

Indexed on: 13 Feb '20Published on: 13 Jun '19Published in: Nano Letters



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] were determined. No evidence of inelastic deformation mechanisms was found before fracture, that 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, which 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.