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Characteristic length of phonon transport within periodic nanoporous thin films and two-dimensional materials

机译:周期性纳米多孔薄膜和二维材料中声子传输的特征长度

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摘要

In the past two decades, phonon transport within nanoporous thin films has attracted enormous attention for their potential applications in thermoelectrics and thermal insulation. Various computational studies have been carried out to explain the thermal conductivity reduction within these thin films. Considering classical phonon size effects, the lattice thermal conductivity can be predicted assuming diffusive pore-edge scattering of phonons and bulk phonon mean free paths. Following this, detailed phonon transport can be simulated for a given porous structure to find the lattice thermal conductivity [Hao et al., J. Appl. Phys. 106, 114321 (2009)]. However, such simulations are intrinsically complicated and cannot be used for the data analysis of general samples. In this work, the characteristic length K-Pore of periodic nanoporous thin films is extracted by comparing the predictions of phonon Monte Carlo simulations and the kinetic relationship using bulk phonon mean free paths modified by K-Pore. Under strong ballistic phonon transport, K-Pore is also extracted by the Monte Carlo ray-tracing method for graphene with periodic nanopores. The presented model can be widely used to analyze the measured thermal conductivities of such nanoporous structures. Published by AIP Publishing.
机译:在过去的二十年中,声子在纳米多孔薄膜中的传输因其在热电和隔热中的潜在应用而引起了极大的关注。已经进行了各种计算研究来解释这些薄膜内的热导率降低。考虑到经典的声子尺寸效应,可以假设声子的扩散孔边缘散射和体声子平均自由程来预测晶格热导率。此后,可以对给定的多孔结构模拟详细的声子传输,以发现晶格热导率[Hao等人,J。Appl。Chem。,1987,53,1897]。物理106,114321(2009)]。但是,这种模拟本质上很复杂,不能用于常规样本的数据分析。在这项工作中,通过比较声子蒙特卡洛模拟的预测和使用由K-Pore修饰的体声子平均自由程的动力学关系,来提取周期性纳米多孔薄膜的特征长度K-Pore。在强弹道声子传输下,还通过蒙特卡洛射线追踪法提取了具有周期性纳米孔的石墨烯的K-孔。提出的模型可以广泛用于分析这种纳米多孔结构的热导率。由AIP Publishing发布。

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