Molecular dynamics simulations of thermal conductivity and spectral phonon relaxation time in suspended and supported graphene
158 citations recorded by the source corpus.
We perform molecular dynamics (MD) simulations with phonon spectral analysis aiming at understanding the two dimensional (2D) thermal transport in suspended and supported graphene. Within the framework of equilibrium MD simulations, we perform spectral energy density (SED) analysis to obtain the lifetime of individual phonon modes. The per-mode contribution to thermal conductivity is then calculated to obtain the lattice thermal conductivity in the temperature range 300-650 K. In contrast to prior studies, our results suggest that the contribution from out-of-plane acoustic (or ZA) branch to thermal conductivity is around 25-30% in suspended single-layer graphene (SLG) at room temperature. The thermal conductivity is found to reduce when SLG is put on amorphous SiO2 substrate. Such reduction is attributed to the strengthened scattering in all phonon modes in the presence of the substrate. Among them, ZA modes are mostly affected with their contribution to thermal conductivity reduced to around 15%. As a result, thermal transport is dominated by in-plane acoustic phonon modes in supported SLG.
Subfields: Civil and Structural Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/52779b991675c094bdf83145b79c80b969541e8a
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Civil and Structural Engineering
In Materials Chemistry
Citations in the corpus
- Colloquium: Phononic thermal properties of two-dimensional materials (2017, methodology): “Most MD simulations confirmed such a relationship between the coupling strength and the thermal conductivity for supported graphene (Chen and Kumar, 2012; Qiu and Ruan, 2012; Chen, Zhang, and Li, 2013; Wei, Yang, Bi, and Chen, 2014).”