Chemically Tuning Mechanics of Graphene by BN

Authors


  • The authors would like to acknowledge the generous financial support from the Defense Threat Reduction Agency (DTRA) Grant # BRBAA08-C-2-0130 and # HDTRA1-13-1-0025, U.S. Nuclear Regulatory Commission Faculty Development Program Grant # NRC-38-08-950 and U.S. Department of Energy (DOE) Nuclear Energy University Program (NEUP) Grant # DE-NE0000325.

Abstract

With finite bandgaps, g-BNC, a boron nitride monolayer (g-BN) phase within a graphene layer, is a promising semiconductor for next generation electronics. We report its mechanics dependence of the g-BN concentration, including the high order elastic constants and mechanical failure, through a first-principles study based on density functional theory. The in-plane stiffness as well as third order elastic constants of graphene can be linearly tuned with g-BN concentration. The longitudinal mode elastic constants are sensitive to the BN modification, in contrast to the shear mode elastic constants. This study may provide guidance in optimizing the mechanics of graphene-based nanodevices.

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