多层石墨烯纳米带的法向热传导  

Cross-plane thermal transport in multilayer graphene nanobundles

作　　者：刘晨晗 董赟[1,2,3] 陈伟宇 陶毅[1,2] 蔡爽[1,2] 魏志勇[1,2] 毕可东[1,2] 杨决宽[1,2] 陈云飞[1,2] 

机构地区：[1]东南大学机械工程学院,南京211189 [2]东南大学江苏省微纳生物医疗器械设计与制造重点实验室,南京211189 [3]兰州理工大学机电工程学院,兰州730050

出　　处：《东南大学学报（自然科学版）》2016年第5期987-991,共5页Journal of Southeast University：Natural Science Edition

基　　金：江苏省普通高校学术学位研究生创新计划资助项目(KYLX15_0058);东南大学优秀博士学位论文培育基金资助项目(YBJJ1541);国家自然科学基金资助项目(51665030)

摘　　要：为了探讨纳米带横截面积和制造过程中可能引起的凸起结构对多层石墨烯纳米带法向热传导的影响,采用了能够反映纳米尺度下声子波属性和量子效应的原子格林函数方法来进行计算研究.结果表明,石墨烯纳米带单位面积法向热导与横截面积呈负相关,并最终趋近于体态值100 M W/(m2·K).造成此现象的原因是随着横截面积的增大,增加的声子支主要位于高频区域,而相对于低频声子,高频声子在界面处的透射值较小.另外,声子局域态密度和透射函数的计算结果表明,凸起会改变热流的传递方向和降低热流传递的效率,从而减小法向热导.In order to explore the effects of cross area and junction,which may be caused during the manufacturing process,on the cross-plane thermal transport of multilayer graphene nanobundles,a calculation research is conducted by using the atomic Green＇s function method,which can describe the phonon wave property and quantum effects on the nanoscale. The results showthat the thermal conductance per unit area of multilayer graphene nanobundles is negatively dependent on the cross area and finally converges to the bulk value 100 MW /（ m2·K）. The reason is that the most increased parts of phonons are located in high-frequency region as the cross area increasing,while high-frequency phonons have lower transmission value at the interface than low-frequency phonons. In addition,the results of phonon local density of states and transmission function showthat the junction can change the heat conduction direction and reduce heat transport efficiency,thus decreasing the crossplane thermal conductance.

关 键 词：原子格林函数法 多层石墨烯纳米带 声子 透射函数 热导 

分 类 号：O469[理学—凝聚态物理]