Thermal and thermoelectric properties of graphene

CBET-0756359，Dames这个为期一年的项目的目标是测量石墨烯的热导率：一个只有一个原子厚的碳片。 虽然石墨烯是众所周知的石墨的构建块，但直到2004年才成功分离出石墨烯的单个薄片。 从那时起，石墨烯就因为基础和应用的原因引起了人们的极大兴趣。 在基本面上，石墨烯中的电子表现出一些独特的行为，比金属或半导体中的正常电子更像光。 在应用方面，石墨烯是一种非常好的电导体，也可以承受极高的电流，使石墨烯成为改变后硅微电子时代的令人兴奋的候选者。 与它的表亲碳纳米管类似，石墨烯也被认为是一种非常好的热导体，这对微电子和热管理应用也有很大的好处。 然而，这一重要特性尚未得到测量。 智力价值：拟议工作的智力价值是提供这种独特而重要的材料的热性能的第一个实验测量。 通过研究热导率与温度、层数和电子浓度的函数关系，这项工作将解决相互矛盾的理论预测，并加深对石墨烯的了解？它具有显著的电子和热性能。 这项研究可能会改变我们的基础知识，因为只有一个原子厚的薄片的性质可能与熟悉的大块材料完全不同，甚至是？传统的？纳米结构如纳米线和薄膜。 更广泛的影响：如果石墨烯在下一代微电子中取代硅，拟议的研究可能会对社会产生重大影响。 该项目还将帮助支持两个不同的研究小组，在物理和机械工程，导致跨学科的思想和技能的激励交流作为两个研究生合作。 所获得的结果将在期刊和会议上广泛传播，并纳入主要研究人员教授的三个班级。

CBET-0756359, Dames The goal of this one-year project is to measure the thermal conductivity of graphene: a sheet of carbon that is only one atom thick. Although graphene is well-known as the building block of graphite, it was not until 2004 that individual sheets of graphene were successfully isolated. Since then, graphene has generated tremendous interest for both fundamental and applied reasons. On the fundamental side, the electrons in graphene exhibit some unique behaviors that are more like light than normal electrons in metals or semiconductors. On the applications side, graphene is a very good electrical conductor which can also tolerate extremely high currents, making graphene an exciting candidate to transform the post-silicon microelectronics era. In analogy to its cousin, the carbon nanotube, graphene is also thought to be a very good thermal conductor, which would also be a great benefit for microelectronics, as well as thermal management applications. However, this important property has not yet been measured. Intellectual Merit:The intellectual merit of the proposed work is to provide the first experimental measurements of the thermal properties of this unique and important material. By studying the thermal conductivity as a function of temperature, the number of layers, and the electron concentration, this work will resolve conflicting theoretical predictions and lead to a deeper understanding of graphene?s remarkable electronic and thermal properties. This study is potentially transformative to our fundamental knowledge because the properties of a sheet that is only one atom thick may be quite different than familiar bulk materials, or even ?conventional? nanostructures such as nanowires and thin films. Broader Impacts:The proposed research may be expected to have major impacts on society if graphene replaces silicon in next-generation microelectronics. This project will also help support two different research groups, in physics and mechanical engineering, leading to a stimulating exchange of ideas and skills across disciplines as the two graduate students collaborate. The results obtained will be disseminated widely in journals and at conferences, and incorporated into three classes taught by the principal investigators.