利用热电桥法研究悬空单层石墨烯的声子热输运性质

项目名称： 利用热电桥法研究悬空单层石墨烯的声子热输运性质

项目编号： No.11304227

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 徐象繁

作者单位： 同济大学

项目金额： 30万元

中文摘要： 因为具有独特的二维晶格结构和高热导率，悬空石墨烯是迄今为止研究二维声子热传输的最佳平台。然而，由于制备悬空石墨烯样品存在很大的难度，从而使得对其热学性质的研究仍处于起步阶段。本项目将悬空微机电系统（MEMS）和CVD石墨烯相结合，利用热电桥法测量不同长度下悬空石墨烯的热导率，尝试解决其热学性质中的几个基本问题：（1）室温悬空石墨烯的数值为多少；（2）石墨烯中的三支声学声子(LA，TA和ZA)分别对其热导起着怎样的作用；（3）石墨烯中是否存在无阻声子热传输，即弹道声子热传输；（4）石墨烯与金属的接触热阻问题。

中文关键词： 石墨烯；二维材料；氮化硼；热导率；

英文摘要： Graphene provides perfect test platform for investigating two-dimensional phonon transports due to its unique two-dimensional structure and its ultra-high thermal conductivity. However, the study of heat conduction in graphene is still in its infancy due to the technical challenge in fabricating suspended single layer graphene suitable for thermal measurements. In this proposal, we will utilize thermal-bridge method to study thermal conductivity in suspended single layer graphene by combining suspended MEMS (Microelectromechanical System ) and CVD-grown graphene. We will try to solve the following issues in graphene thermal conduction:(1)what's the intrinsic thermal conductivity value in suspended graphene at room temperature; (2)which branch of acoustic phonons dominate thermal conduction in graphene, LA, TA or ZA phonons; (3)can phonons travel in graphene without being scattered, i.e. ballistic phonon transport; (4)thermal contact resistance issue between graphene and metal.

英文关键词： graphene；two-dimentional materials；boron nitride；thermal conductivity；