Suppressed Thermal Conductivity in Polycrystalline Gold Nanofilm: The Effect of Grain Boundary and Substrate
Suppressed Thermal Conductivity in Polycrystalline Gold Nanofilm: The Effect of Grain Boundary and Substrate
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DOI：
10.1088/0256-307x/38/2/027202
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发表时间：
2021-02-01
影响因子：
3.5
通讯作者：
Bao, Hua
中科院分区：
文献类型：
--
作者：
Dong, Lan;Wu, Xiangshui;Bao, Hua
我们研究了厚度从40.5 nm到115.8 nm的多晶金纳米膜的导电性和导热性，并确定了厚度相关的导电性，这可以通过Mayadas和Shatzkes （MS）理论来解释。与此同时，与在大块材料中发现的相比，观察到抑制的导热性，以及弱厚度效应。我们比较了悬浮和支撑的金膜的热导率，发现支撑衬底可以有效地抑制多晶金纳米膜的面内热导率。结果表明，晶界散射和衬底散射会影响多晶金属体系中电子和声子的输运。
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.