Jump to main content
Jump to site search


Shear deformation-induced anisotropic thermal conductivity of graphene

Abstract

Graphene-based materials exhibit intriguing phononic and thermal properties. In this paper, we have investigated the heat conductance in graphene sheets under shear-strain-induced wrinkling deformation, using equilibrium molecular dynamics simulations. A significant orientation dependence of thermal conductivity of graphene wrinkle (GW) is observed. The directional dependence of thermal conductivity of GW stems from the anisotropy of phonon group velocities as revealed by the G-band broadening of phonon density of states (DOS), the anisotropy of thermal resistances as evidenced by the G-band peak mismatch of phonon DOS, and the anisotropy of phonon relaxation time as a direct result of the double-exponential-fitting of heat current autocorrelation function. By analyzing the relative contributions of different lattice vibrations to heat flux, we have shown that the contributions of different lattice vibrations to heat flux of GW are sensitive to the heat flux direction, which further indicates the orientation-dependent thermal conductivity of GW. Moreover, we have found that, in the strain range of 0-0.1, the anisotropy ratio of GW increases monotonously with increasing shear strain. It is induced by the change in the number of wrinkles, which is more influential in the direction perpendicular to the wrinkle texture. The findings elucidated here emphasize the utility of wrinkle engineering for manipulation of nanoscale heat transport, which offers opportunities for the development of thermal channeling devices.

Back to tab navigation

Publication details

The article was received on 19 Sep 2017, accepted on 05 Dec 2017 and first published on 05 Dec 2017


Article type: Paper
DOI: 10.1039/C7CP06415B
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
  •   Request permissions

    Shear deformation-induced anisotropic thermal conductivity of graphene

    L. Cui, S. Shi, G. Wei and X. du, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP06415B

Search articles by author

Spotlight

Advertisements