纳米“热点”系统中的梯度热导率  

Graded thermal conductivity in nano“hot spot”systems

作　　者：吴志鹏 张创 胡世谦 马登科 杨诺[1] Wu Zhi-Peng;Zhang Chuang;Hu Shi-Qian;Ma Deng-Ke;Yang Nuo(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Department of Physics,Hangzhou Dianzi University,Hangzhou 310018,China;School of Physics and Astronomy,Yunnan University,Kunming 650091,China;School of Physical Science and Technology,Nanjing Normal University,Nanjing 210000,China)

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074 [2]杭州电子科技大学物理系,杭州310018 [3]云南大学物理与天文学院,昆明650091 [4]南京师范大学物理科学与技术学院,南京210000

出　　处：《物理学报》2023年第18期152-158,共7页Acta Physica Sinica

基　　金：国家重点研发计划政府间联合项目(批准号:2018YFE0127800)资助的课题。

摘　　要：纳米“热点”系统中的梯度变化热导率,是纳米尺度热传导中的新现象.背后的新机理,为解决纳米器件散热等工程问题提供理论基础.首先回顾了近期在纳米体系中发现的热传导新现象.然后,重点围绕“热点”梯度热导率,阐述了不同维度体系的梯度热导率变化规律.并根据原子振动模式与声子散射的变化,阐释了梯度热导率的物理机制.最后,概述了纳米“热点”的梯度热导率特性给纳米器件散热带来的新挑战和新机遇,并对未来在该方向研究进行展望.The graded thermal conductivity in nanoscale“hot spot”system is a new phenomenon in nanoscale heat conduction.It is found that the thermal conductivity is no longer uniform,and the thermal conductivity gradually increases from the inside to the outside in the radial direction,which no longer obeys Fourier’s law of thermal conductivity.An in-depth understanding of the mechanism of the graded thermal conductivity can provide a theoretical basis for solving engineering problems such as heat dissipation of nanochip.This paper first reviews the new phenomenon of heat conduction recently discovered in nanosystem,then,focuses on the graded thermal conductivity in the“hot spot”system,and expounds the variation law of the graded thermal conductivity in different dimensional systems.According to the changes of atomic vibration mode and phonon scattering,the physical mechanism of the graded thermal conductivity is explained.Finally,the new challenges and opportunities brought by the graded thermal conductivity characteristics of nano“hot spot”to the heat dissipation of nanodevices are summarized,and the future research in this direction is also prospected.

关 键 词：声子工程 微纳尺度导热 纳米芯片热管理 纳米“热点” 梯度热导率 

分 类 号：TB383.1[一般工业技术—材料科学与工程]