论文标题
具有不同结构质量的无定形石墨烯的热传输
Thermal Transport in Amorphous Graphene with Varying Structural Quality
论文作者
论文摘要
最近已经证明了晶圆尺度二维非晶碳单层的合成。当整合作为金属，半导体或磁性材料的涂层时，该材料具有有用的特性，例如实现有效的原子层沉积，从而促进了超级反应技术的发展。在这里，我们提出了如何通过晶体生长温度来控制这种碳膜的无形的结构程度。我们还通过对新兴振动模式进行系统的分析来确定该材料中的能量如何随着空间对称性的损失而增加，从而导致可调的热导率的数量级多两个以上的数量级。我们的模拟提供了一些食谱，以根据目标应用（例如超薄散布者，能量收割机或绝缘热屏障）设计最合适的“无定形石墨烯”。
The synthesis of wafer-scale two-dimensional amorphous carbon monolayers has been recently demonstrated. This material presents useful properties when integrated as coating of metals, semiconductors or magnetic materials, such as enabling efficient atomic layer deposition and hence fostering the development of ultracompact technologies. Here we propose a characterization of how the structural degree of amorphousness of such carbon membranes could be controlled by the crystal growth temperature. We also identify how energy is dissipated in this material by a systematic analysis of emerging vibrational modes whose localization increases with the loss of spatial symmetries, resulting in a tunable thermal conductivity varying by more than two orders of magnitude. Our simulations provide some recipe to design most suitable "amorphous graphene" based on the target applications such as ultrathin heat spreaders, energy harvesters or insulating thermal barriers.
