Chin. Phys. Lett.  2021, Vol. 38 Issue (2): 027202    DOI: 10.1088/0256-307X/38/2/027202
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*
1University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China
2Center for Phononics and Thermal Energy Science, China-EU Joint Center for Nanophononics, School of Physics Science and Engineering, Tongji University, 200092 Shanghai 200092, China
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Lan Dong, Xiangshui Wu, Yue Hu et al  2021 Chin. Phys. Lett. 38 027202
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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.
Received: 06 October 2020      Published: 27 January 2021
PACS:  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)  
Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 51676121 and 12004242).
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Lan Dong
Xiangshui Wu
Yue Hu
Xiangfan Xu
and Hua Bao
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