Abstract Thermal conductivities of Ag nanowires with different sizes and temperatures were studied theoretically. The lattice and electronic thermal conductivities of Ag nanowires include contributions from interface scattering and grain boundary scattering. While the molecular dynamic simulation was used to get the contribution of interface scattering to the lattice thermal conductivity of Ag nanowires along the axial direction, a model derived from Boltzmann transport equation and the Wiedemann-Franz relation were applied to calculate electronic thermal conductivities of Ag nanowires along the axial direction. And then coupling with the lattice and electronic thermal conductivities, the effective thermal conductivity of Ag nanowire along the axial direction was obtained. Furthermore, Kubo linear-response formalism was used to approximately predict the thermal conductivity in the plane perpendicular to the axis of the Ag nanowire. It turns out that effective thermal conductivities of Ag nanowire in the r-θ plane and along the Z direction show a great anisotropy. Finally, by measuring the thermal conductivities of Ag/SBA-15, the thermal conductivity of a single Ag nanowire can be obtained by using PWDM model, and the theoretical thermal conductivities of Ag nanowire were compared with the experimental results.

中文翻译：

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银(Ag)纳米线在介孔基底中热导率的理论与实验研究

摘要 从理论上研究了不同尺寸和温度的银纳米线的热导率。Ag 纳米线的晶格和电子热导率包括界面散射和晶界散射的贡献。使用分子动力学模拟得到界面散射对沿轴向的银纳米线晶格热导率的贡献，并应用从玻尔兹曼传输方程和Wiedemann-Franz关系导出的模型来计算银纳米线的电子热导率沿轴向。然后与晶格和电子热导率耦合，得到银纳米线沿轴向的有效热导率。此外，Kubo 线性响应形式用于近似预测垂直于 Ag 纳米线轴的平面中的热导率。结果表明，银纳米线在 r-θ 平面和沿 Z 方向的有效热导率表现出很大的各向异性。最后，通过测量Ag/SBA-15的导热系数，利用PWDM模型可以得到单根Ag纳米线的导热系数，并将Ag纳米线的理论导热系数与实验结果进行比较。