Abstract
We have performed molecular dynamics simulations with phonon spectral analysis to predict the mode-wise phonon relaxation times (RT) of suspended and supported graphene at room temperature, and the findings are consistent with recent optical measurements. For acoustic phonons, RTs reduce from up to 50 ps to less than 5 ps when graphene is put on silicon dioxide substrate. Similarly, optical phonon RTs reduce by half when supported. Stronger interfacial bonding is found to result in more RT reduction. Our results provide a fundamental understanding at the spectral phonon property level for the observed thermal conductivity reduction in supported graphene. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4712041]
Keywords
MOLECULAR-DYNAMICS SIMULATIONS; LATTICE THERMAL-CONDUCTIVITY; FIELD; BULK
DOI
10.1063/1.4712041
Citation
Bo Qiu and Xiulin Ruan. Appl. Phys. Lett. 100, 193101 (2012); http://dx.doi.org/10.1063/1.4712041
Date of this Version
5-7-2012
Recommended Citation
Qiu, Bo and Ruan, Xiulin, "Reduction of spectral phonon relaxation times from suspended to supported graphene" (2012). Birck and NCN Publications. Paper 1192.
http://dx.doi.org/10.1063/1.4712041
Comments
Copyright (2012) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Appl. Phys. Lett. 100, 193101 (2012) and may be found at http://dx.doi.org/10.1063/1.4712041. The following article has been submitted to/accepted by Applied Physics Letters. Copyright 2012 Bo Qiu and Xiulin Ruan. This article is distributed under a Creative Commons Attribution 3.0 Unported License.