Relationship between electrical and thermal conductivity in graphene-based transparent and conducting thin films

We measured and modeled the electrical, optical and thermal properties of transparent and conducting thin films based on graphene and graphitic platelets. Thermal conductivity of our films decreases with increasing electrical conductivity. Our experiments indicate that, for sufficiently large platelets, the influence factor in controlling the thermal conductivity is represented by the junctions between neighboring graphene platelets. The thickness of such junctions is determined by the average number of graphene layers (N) forming each platelet. The fact that both the thermal and electrical properties depend on N allows us to establish a model that leads to a theoretical relationship between the thermal and electrical conductivity in our samples, which is general enough to be applied to a large class of graphene-based thin films. (C) 2013 Elsevier Ltd. All rights reserved.

我们对基于石墨烯和石墨薄片的透明导电薄膜的电学、光学和热学性质进行了测量和建模。我们制备的薄膜的热导率随着电导率的增加而降低。我们的实验表明，对于足够大的薄片，控制热导率的影响因素是相邻石墨烯薄片之间的连接点。这种连接点的厚度由构成每个薄片的石墨烯层数（N）的平均值决定。热学和电学性质都取决于N这一事实使我们能够建立一个模型，该模型得出了我们样品中热导率和电导率之间的理论关系，这种关系具有足够的普遍性，可应用于一大类基于石墨烯的薄膜。（C）2013爱思唯尔有限公司。保留所有权利。