Tunable Positive/Negative Young's Modulus in Graphene-Based Metamaterials

F Lin and Y Xiang and HS Shen, ADVANCED THEORY AND SIMULATIONS, 4, 2000130 (2021).

DOI: 10.1002/adts.202000130

Mechanical metamaterials exhibit unusual mechanical properties that originate from their topological design. Origami graphene may provide a platform for constructing novel carbon nanostructures. In the current study, a novel composite material that incorporates aligned graphene with localized origami shapes into the copper matrix is designed. Unlike many auxetic materials that have void phase, the proposed layer-by-layer assembled composite material appears to be solid in the microscopic scale. Based on the molecular dynamics (MD) simulations, it is observed that depending on the origami shapes, the in-plane Poisson's ratio of origami graphene reinforced copper (100) composites can be tuned from positive to negative and, more importantly, it is discovered that the Young's modulus of the graphene/Cu composites can also be tuned from positive to negative in certain in-plane directions.

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