Thermal properties of graphene: Fundamentals and applications
Thermal properties of graphene: Fundamentals and applications
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DOI：
10.1557/mrs.2012.203
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发表时间：
2012-12-01
期刊：
影响因子：
5
通讯作者：
Roy, Ajit K.
中科院分区：
文献类型：
--
作者：
Pop, Eric;Varshney, Vikas;Roy, Ajit K.
石墨烯是一种二维(2D)材料，在平面内和平面外方向之间的热流各向异性超过100倍。高的面内导热系数是由于碳原子之间的共价sp(2)键，而面外热流则受到弱的范德华耦合的限制。在这里，我们回顾了石墨烯的热性质，包括它的比热和导热系数(从扩散到弹道极限)以及衬底、缺陷和其他原子修饰的影响。我们还重点介绍了石墨烯的热性质在其中发挥作用的实际应用。例如，石墨烯晶体管和互连受益于高的面内导热系数，最高可达一定的沟道长度。然而，与基板的弱热耦合意味着界面和接触仍然是重要的耗散瓶颈。石墨烯或石墨烯复合材料中的热流也可以通过各种方式进行调节，包括通过衬底、边缘或界面的声子散射。归根结底，石墨烯不同寻常的热性能源于它的2D性质，为热流物理的新发现提供了丰富的游乐场，并可能导致新的热管理应用。
Graphene is a two-dimensional (2D) material with over 100-fold anisotropy of heat flow between the in-plane and out-of-plane directions. High in-plane thermal conductivity is due to covalent sp(2) bonding between carbon atoms, whereas out-of-plane heat flow is limited by weak van der Waals coupling. Herein, we review the thermal properties of graphene, including its specific heat and thermal conductivity (from diffusive to ballistic limits) and the influence of substrates, defects, and other atomic modifications. We also highlight practical applications in which the thermal properties of graphene play a role. For instance, graphene transistors and interconnects benefit from the high in-plane thermal conductivity, up to a certain channel length. However, weak thermal coupling with substrates implies that interfaces and contacts remain significant dissipation bottlenecks. Heat flow in graphene or graphene composites could also be tunable through a variety of means, including phonon scattering by substrates, edges, or interfaces. Ultimately, the unusual thermal properties of graphene stem from its 2D nature, forming a rich playground for new discoveries of heat-flow physics and potentially leading to novel thermal management applications.