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首页> 外文会议>Micro/Nanoscale Heat Transfer International Conference 2008 >THERMAL AND ELECTRICAL CONDUCTIVITIES OF POLYCRYSTALLINE METALLIC NANOFILMS BASED ON THE KINETIC THEORY
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THERMAL AND ELECTRICAL CONDUCTIVITIES OF POLYCRYSTALLINE METALLIC NANOFILMS BASED ON THE KINETIC THEORY

机译：基于动力学理论的多晶金属纳米薄膜的热电导率

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摘要

A model is developed for in-plane thermal conductivity of nanostructured metallic films based on the kinetic theory, which attributes the reduced thermal conductivity to the reduced mean free path of electrons. The partially inelastic electron-surface scattering and grain-boundary impedance by quantum mechanical treatment are elaborately included. Meanwhile, the mean free path of electrons is also used to study in-plane electrical conductivity of nanofilms. Both electrical conductivity and thermal conductivity, varying with film thickness and temperature, are observed to be lower than corresponding bulk values, agreeing well with the experimental data. The grain-boundary scattering is theoretically found to dominate over surface scattering to enhance the size effect on electrical and thermal conductivities. In addition, the size effect in low temperature appears more dramatic due to larger electron Knudsen number. We further examine the Lorenz number of nanofilms and find the Wiedemann-Franz law is seriously violated. The Coulomb blockade and the neutral excitation of electron-hole pair are used to offer a more detailed picture. Excessive thermal conductivity is also evaluated resorting to concepts in granular metals to show the validity of this account.
机译：基于动力学理论，开发了一种用于纳米结构金属膜的平面内热导率的模型，该模型将热导率的降低归因于电子平均自由程的降低。详细介绍了通过量子力学处理产生的部分非弹性电子表面散射和晶界阻抗。同时，电子的平均自由程也用于研究纳米膜的面内电导率。随厚度和温度变化的电导率和热导率均低于相应的体积值，与实验数据吻合良好。从理论上发现，晶界散射比表面散射更重要，以增强尺寸对电导率和导热率的影响。此外，由于更大的电子克努森数，低温下的尺寸效应显得更为明显。我们进一步检查了纳米膜的Lorenz数，发现Wiedemann-Franz法被严重违反。库仑阻挡和电子-空穴对的中性激发用于提供更详细的图像。还通过使用粒状金属中的概念来评估过大的热导率，以证明该方法的有效性。

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