Suppressed Thermal Conductivity in Polycrystalline Gold Nanofilm: The Effect of Grain Boundary and Substrate
Lan Dong1† , Xiangshui Wu2 , Yue Hu1 , Xiangfan Xu2* , and Hua Bao1*
1 University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China2 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
Abstract ：We investigate the electrical conductivity and thermal conductivity of polycrystalline gold nanofilms, with thicknesses ranging from 40.5 nm 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.
收稿日期: 2020-10-06
出版日期: 2021-01-27
:
72.15.Cz
(Electrical and thermal conduction in amorphous and liquid metals and Alloys ?)
72.15.-v
(Electronic conduction in metals and alloys)
73.50.-h
(Electronic transport phenomena in thin films)
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2021, Vol. 38 
