Suppressed Thermal Conductivity in Polycrystalline Gold Nanofilm:The Effect of Grain Boundary and Substrate  

作　　者：Lan Dong Xiangshui Wu Yue Hu Xiangfan Xu Hua Bao 董岚;吴祥水;胡跃;徐象繁;鲍华(University of Michigan-Shanghai Jiao Tong University Joint Institute,Shanghai Jiao Tong University,Shanghai 200240,China;Center for Phononics and Thermal Energy Science,China-EU Joint Center for Nanophononics,School of Physics Science and Engineering,Tongji University,200092 Shanghai 200092,China)

机构地区：[1]University of Michigan-Shanghai Jiao Tong University Joint Institute,Shanghai Jiao Tong University,Shanghai 200240,China [2]Center for Phononics and Thermal Energy Science,China-EU Joint Center for Nanophononics,School of Physics Science and Engineering,Tongji University,200092 Shanghai 200092,China

出　　处：《Chinese Physics Letters》2021年第2期78-83,共6页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(Grant Nos.51676121 and 12004242).

摘　　要：We investigate the electrical conductivity and thermal conductivity of polycrystalline gold nanofilms,with thicknesses ranging from 40.5nm to 115.8 nm,and identify a thickness-dependent electrical conductivity,which can be explained via the Mayadas and Shatzkes(MS)theory.At the same time,a suppressed thermal conductivity is observed,as compared to that found in the bulk material,together with a weak thickness effect.We compare the thermal conductivity of suspended and supported gold films,finding that the supporting substrate can effectively suppress the in-plane thermal conductivity of the polycrystalline gold nanofilms.Our results indicate that grain boundary scattering and substrate scattering can affect electron and phonon transport in polycrystalline metallic systems.

关 键 词：CONDUCTIVITY POLYCRYSTALLINE SCATTERING 

分 类 号：O484.4[理学—固体物理]