title: Intrinsic energy dissipation in CVD-grown graphene nanoresonators.
abstract: We utilize classical molecular dynamics to study the quality (Q)-factors of monolayer CVD-grown graphene nanoresonators. In particular, we focus on the effects of intrinsic grain boundaries of different orientations, which result from the CVD growth process, on the Q-factors. For a range of misorientation angles that are consistent with those seen experimentally in CVD-grown graphene, i.e. 0° to ∼20°, we find that the Q-factors for graphene with intrinsic grain boundaries are 1-2 orders of magnitude smaller than that of pristine monolayer graphene. We find that the Q-factor degradation is strongly influenced by both the symmetry and structure of the 5-7 defect pairs that occur at the grain boundary. Because of this, we also demonstrate that the Q-factors of CVD-grown graphene can be significantly elevated, and approach that of pristine graphene, through application of modest (1%) tensile strain.
authors.affiliation: Department of Mechanical Engineering, 110 Cummington, Boston, MA 02215, USA.
authors.forename: Zenan
authors.initials: Z
authors.lastname: Qi
authors.forename: Harold S
authors.initials: HS
authors.lastname: Park