Universal deformation pathways and flexural hardening of nanoscale 2D-material standing folds

H Chacham and APM Barboza and AB de Oliveira and CK de Oliveira and RJC Batista and BRA Neves, NANOTECHNOLOGY, 29, 095704 (2018).

DOI: 10.1088/1361-6528/aaa51e

In the present work, we use atomic force microscopy nanomanipulation of 2D-material standing folds to investigate their mechanical deformation. Using graphene, h-BN and talc nanoscale wrinkles as testbeds, universal force-strain pathways are clearly uncovered and well-accounted for by an analytical model. Such universality further enables the investigation of each fold bending stiffness kappa as a function of its characteristic height h(0). We observe a more than tenfold increase of kappa as h(0) increases in the 10-100 nm range, with power-law behaviors of kappa versus h(0) with exponents larger than unity for the three materials. This implies anomalous scaling of the mechanical responses of nano- objects made from these materials. Supplementary material for this article is available online

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