1201.6355 (Zhi-Xin Guo et al.)

Thermal conductivity of epitaxial graphene nanoribbons on SiC    [PDF]

Zhi-Xin Guo, J. W. Ding, Xin-Gao Gong

We investigate thermal conductivity of epitaxial single-layer and bilayer
graphene nanoribbons (GNRs) on SiC substrate using the nonequilibrium molecular
dynamics method. Both covalently bonded and weakly coupled GNR-substrate
interaction conditions are considered. In the covalently bonded condition, the
thermal conductivity of single-layer GNRs is particularly low, while, in the
weakly coupled condition the thermal conductivity is close to that of the
suspended GNRs. The second GNR layer in a bilayer GNR is found to have the
highest thermal conductivity among all the epitaxial GNRs, which also keeps
much the same thermal conductivity characteristics as the suspended GNRs. We
further find the out-of-plane phonon mode plays a critical role on the thermal
conductivity reduction of the second GNR layer.

View original: http://arxiv.org/abs/1201.6355