Characterization of surface and nonlinear elasticity in wurtzite ZnO nanowires
Résumé
Surface elasticity and nonlinear effects are reported in ZnO nanowires and characterized by ab initio calcu- lations. Fully anisotropic elastic and stress coefficients related to (10 10) surfaces are provided and used to construct a continuum model of nanowires based on the Gurtin-Murdoch surface elasticity theory, able to capture mechanical size effects. Nonlinear elasticity is observed through non-zero third order energy deriva- tive terms with respect to axial strain in the direction of the nanowire. The associated material parameters are found to be themselves size-dependent.
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