| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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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| Cite this article: |
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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.
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Received: 06 October 2020
Published: 27 January 2021
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| PACS: |
72.15.Cz
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(Electrical and thermal conduction in amorphous and liquid metals and Alloys ?)
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72.15.-v
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(Electronic conduction in metals and alloys)
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73.50.-h
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(Electronic transport phenomena in thin films)
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| Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 51676121 and 12004242). |
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