Diffraction and near-zero transmission of flexural phonons at graphene grain boundaries

Abstract

Graphene grain boundaries are known to affect phonon transport and thermal conductivity, suggesting that they may be used to engineer the phononic properties of graphene. Here, the effect of two buckled grain boundaries on long-wavelength flexural acoustic phonons has been investigated as a function of angle of incidence using molecular dynamics. The flexural acoustic mode has been chosen due to its importance to thermal transport. It is found that the transmission through the boundaries is strongly suppressed for incidence angles close to 35${}^{\circ }$. Also, the grain boundaries are found to act as diffraction gratings for the phonons.

References in corpus (5)

• Thermal properties of graphene: Fundamentals and applications
• Control and Characterization of Individual Grains and Grain Boundaries in Graphene Grown by Chemical Vapor Deposition
• Polycrystalline graphene and other two-dimensional materials
• Effect of Grain Boundaries on Thermal Transport in Graphene
• Scattering of flexural acoustic phonons at grain boundaries in graphene

Cited by in corpus (1)

• Structure-specific, mode-resolved phonon coherence and specularity at graphene grain boundaries