Mechanical Properties of Atomically Thin Boron Nitride and the Role of Interlayer Interactions


Atomically thin boron nitride (BN) nanosheets are important two-dimensional nanomaterials with many unique properties distinct from those of graphene, but investigation into their mechanical properties remains incomplete. Here we report that high-quality single-crystalline mono-and few-layer BN nanosheets are one of the strongest electrically insulating materials. More intriguingly, few-layer BN shows mechanical behaviours quite different from those of few-layer graphene under indentation. In striking contrast to graphene, whose strength decreases by more than 30% when the number of layers increases from 1 to 8, the mechanical strength of BN nanosheets is not sensitive to increasing thickness. We attribute this difference to the distinct interlayer interactions and hence sliding tendencies in these two materials under indentation. The significantly better interlayer integrity of BN nanosheets makes them a more attractive candidate than graphene for several applications, for example, as mechanical reinforcements.



Elasticity, Graphene, Strength of materials, Molecular-dynamics, Raman-spectroscopy, Molybdenum disulfide, Boron nitride

Australian Research Council (ARC) via Discovery Early Career Researcher Award (DE160100796); Discovery Project (DP150102346); NSFC (No. 51420105002 and 51572197); Institute for Basic Science (IBS-R019-D1); Institute for Basic Science (IBS-R019-D1); NSF grants TG-DMR120049 and TG-DMR150017; Queens Fellow Award through the start-up grant number M8407MPH; Elemental Strategy Initiative conducted by the MEXT, Japan and JSPS KAKENHI Grant Numbers JP26248061, JP15K21722 and JP25106006.


CC BY 4.0 (Attribution), ©2017 The Authors.