  We perform classic molecular dynamics simulations to comparatively
investigate the mechanical properties of single-layer MoS2 and a
graphene/MoS2/graphene heterostructure under uniaxial tension. We show that the
lattice mismatch between MoS2 and graphene will lead to an spontaneous strain
energy in the interface. The Young's modulus of MoS2 can be enhanced by a
factor of five by sandwiching it between two graphene layers. While the
stiffness is enhanced, the yield strain of the MoS2 is reduced due to lateral
buckling of the outer graphene layers due to the applied mechanical tension.
