期刊
JOURNAL OF MATERIALS RESEARCH
卷 29, 期 3, 页码 362-372出版社
SPRINGER HEIDELBERG
DOI: 10.1557/jmr.2013.380
关键词
grain boundaries; thermal conductivity; polycrystalline graphene
资金
- National Natural Science Foundation of China [11222217, 11002079]
- Tsinghua University Initiative Scientific Research Program [2011Z02174]
Phonon thermal conduction was explored and discussed through a combined theoretical and simulation approach in this work. The thermal conductivity kappa of polycrystalline graphene was calculated by molecular dynamics simulations based on a hexagonal patch model in close consistency with microstructural characterization in experiments. The effects of grain size, alignment, and temperature were identified with discussion on the microscopic phonon scattering mechanisms. The effective thermal conductivity was found to increase with the grain size and decrease with the mismatch angle and dislocation density at the grain boundaries (GBs). The similar to T (-1) temperature dependence of kappa is significantly weakened in the polycrystals. The effect of GBs in modifying thermal transport properties of graphene was characterized by their effective width and thermal conductivity as an individual phase, which was later included in a predictive effective medium model that showed degraded reduction in thermal conductivity for grains larger than a few micrometers.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据