Highly Deformable Graphene Kirigami

TL;DR

This paper introduces graphene kirigami, a novel approach applying macro-scale kirigami concepts to graphene, significantly increasing its stretchability and ductility, which could impact mechanical and electronic applications.

Contribution

The work demonstrates, through molecular dynamics simulations, that graphene kirigami can triple the yield and fracture strains of graphene, enhancing its mechanical flexibility.

Findings

Yield and fracture strains increased by about three times.

Kirigami patterning enhances graphene's ductility.

Potential for new mechanical and electronic applications.

Abstract

Graphene's exceptional mechanical properties, including its highest-known stiffness (1 TPa) and strength (100 GPa) have been exploited for various structural applications. However, graphene is also known to be quite brittle, with experimentally-measured tensile fracture strains that do not exceed a few percent. In this work, we introduce the notion of graphene kirigami, where concepts that have been used almost exclusively for macroscale structures are applied to dramatically enhance the stretchability of both zigzag and armchair graphene. Specifically, we show using classical molecular dynamics simulations that the yield and fracture strains of graphene can be enhanced by about a factor of three using kirigami as compared to standard monolayer graphene. This enhanced ductility in graphene should open up interesting opportunities not only mechanically, but also in coupling to graphene's electronic behavior.