Abstract The reduced dimensionality makes low-dimensional nanomaterials possessing diverse unusual size-dependent transport properties, due to the distinct quantum confinement, surface and interfacial scatterings for electron, photon and phonon at the nanoscale. In this review, we summarize the state-of-the-art studies on the topic of size-dependent phononic thermal transport in low-dimensional nanomaterials, including both theoretical and experimental reports. First, the length-dependent thermal transport in quasi-one-dimensional (quasi-1D) and two-dimensional (2D) nanomaterials are discussed, in which the underlying fundamental physics are correspondingly summarized. Then, we review the various effects of transverse dimensions on the thermal conductivity, including the diameter effect in nanowires, and the thickness and width effects in 2D sheets and nanoribbons. Finally, considering the significant importance of interfacial thermal resistance in nanoscale devices due to the increased density of interface, the size effect on the interfacial thermal resistance and thermal rectification is also discussed. The basic concept of phononic engineering to control the interfacial thermal resistance and also the detailed phonon scattering mechanisms are summarized. This perspective review would provide basic and advanced knowledge to understand and utilize the size-dependent thermal transport in nanomaterials, which will be beneficial to the further understanding of energy transport and conversion in the low-dimensional quantum devices.

中文翻译：

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低维纳米材料中尺寸相关的声子热传输

摘要 由于电子、光子和声子在纳米尺度上的独特量子限制、表面和界面散射，降维使低维纳米材料具有多种不同寻常的尺寸相关传输特性。在这篇综述中，我们总结了关于低维纳米材料中尺寸相关声子热传输主题的最新研究，包括理论和实验报告。首先，讨论了准一维 (quasi-1D) 和二维 (2D) 纳米材料中长度相关的热传输，其中相应地总结了基础物理。然后，我们回顾了横向尺寸对热导率的各种影响，包括纳米线的直径效应，以及二维片材和纳米带的厚度和宽度效应。最后，考虑到由于界面密度增加，界面热阻在纳米级器件中的重要性，还讨论了界面热阻和热整流的尺寸效应。总结了控制界面热阻的声子工程的基本概念以及详细的声子散射机制。本综述将为理解和利用纳米材料中与尺寸相关的热传输提供基础和先进的知识，这将有利于进一步理解低维量子器件中的能量传输和转换。考虑到由于界面密度增加，界面热阻在纳米级器件中的重要性，还讨论了界面热阻和热整流的尺寸效应。总结了控制界面热阻的声子工程的基本概念以及详细的声子散射机制。本综述将为理解和利用纳米材料中与尺寸相关的热传输提供基础和先进的知识，这将有利于进一步理解低维量子器件中的能量传输和转换。考虑到由于界面密度增加，界面热阻在纳米级器件中的重要性，还讨论了界面热阻和热整流的尺寸效应。总结了控制界面热阻的声子工程的基本概念以及详细的声子散射机制。本综述将为理解和利用纳米材料中与尺寸相关的热传输提供基础和先进的知识，这将有利于进一步理解低维量子器件中的能量传输和转换。总结了控制界面热阻的声子工程的基本概念以及详细的声子散射机制。本综述将为理解和利用纳米材料中与尺寸相关的热传输提供基础和先进的知识，这将有利于进一步理解低维量子器件中的能量传输和转换。总结了控制界面热阻的声子工程的基本概念以及详细的声子散射机制。本综述将为理解和利用纳米材料中与尺寸相关的热传输提供基础和先进的知识，这将有利于进一步理解低维量子器件中的能量传输和转换。