▎ 摘　　要

The thermal transport properties of graphene nanoribbons with cavities are studied by non-equilibrium Green's function approach. A comparative analysis between in-plane and out-of-plane modes is made. The results show that the quantized thermal-conductance plateau of in-plane modes is wider and not broken in graphene nanoribbon with cavities. Contribution of the out-of-plane modes to the total thermal conductance increases with low temperature and decreases with high temperature for perfect graphene nanoribbons. However, the cavities make this contribution down at low temperatures. (C) 2014 Elsevier Ltd. All rights reserved.