Strain engineering for mechanical properties in graphene nanoribbons revisited: The warping edge effect

JW Jiang, JOURNAL OF APPLIED PHYSICS, 119, 234301 (2016).

DOI: 10.1063/1.4954019

We investigate the strain engineering and the edge effect for mechanical properties in graphene nanoribbons. The free edges of the graphene nanoribbons are warped due to compressive edge stresses. There is a structural transformation for the free edges from the three-dimensional warping configuration to the two-dimensional planar structure at the critical strain epsilon(c) = 0.7%, at which the applied mechanical stress is equal to the intrinsic compressive edge stress. This structural transformation leads to step-like changes in several mechanical properties studied in the present work, including the Young's modulus, the Poisson's ratio, the quality factor of nanomechanical resonators, and the phonon edge mode. Published by AIP Publishing.

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