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首页> 外文期刊>International Journal of Heat and Mass Transfer >Variable-spot-size laser-flash Raman method to measure in-plane and interfacial thermal properties of 2D van der Waals heterostructures
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Variable-spot-size laser-flash Raman method to measure in-plane and interfacial thermal properties of 2D van der Waals heterostructures

机译：可变光斑尺寸的激光拉曼法测量二维范德华异质结构的面内和界面热性能

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摘要

Stacked layers of different atomically thin 2D materials is called the van der Waals (vdW) heterostructure, which has become a rapidly developing research field due to its extraordinary and tunable properties. In this paper, we develop a variable-spot-size laser-flash Raman method toin-situmeasure the thermal properties as well as the laser absorption in the supported 2D vdW heterostructure with arbitrary layers. The extracted thermal properties include the in-plane thermal conductivity and diffusivity of each layer, and interfacial thermal conductance between every two adjacent layers. A three-dimensional transient heat conduction model is developed and analytically solved to describe the process of pulsed Gaussian laser heating supportedn-layer heterostructure. The temperature of each atomic layer can be simultaneously non-contact detected from their distinct Raman peaks whose positions are temperature dependent. The laser spot sizes and pulse durations are varied to generate multiple temperature curves. The multiple thermal properties as well as the laser absorption can be extracted by simultaneously fitting these temperature curves into the analytical solutions at multiple spot sizes or/and pulse durations. We also establish the approach of sensitivity and uncertainty analysis for the multi-response multi-parameter least-square fitting in our proposed measurement methods. Case studies show that the transient temperature curves are generally more sensitive to the thermal properties than the steady-state temperatures at variable spot sizes. All the unknown thermal properties and laser absorption can be extracted with sufficiently high accuracy if multiple transient temperature curves at multiple spot sizes are simultaneously fitted into the analytical solution. The measurement method and uncertainty analysis approach presented here are useful for investigating the thermal transport in the emerging 2D materials and vdW heterostructures.
机译：不同原子薄的2D材料的堆叠层称为van der Waals（vdW）异质结构，由于其非凡且可调节的特性，它已成为一个快速发展的研究领域。在本文中，我们开发了一种可变光斑大小的激光拉曼方法，用于在任意层的二维二维vdW异质结构中原位测量热性能以及激光吸收。提取的热特性包括每层的面内热导率和扩散率，以及每两个相邻层之间的界面热导率。建立了三维瞬态热传导模型，并对其进行了解析求解，以描述脉冲高斯激光加热支撑层异质结构的过程。每个原子层的温度可以同时从其位置取决于温度的不同拉曼峰中进行非接触检测。改变激光光斑的大小和脉冲持续时间以生成多个温度曲线。通过同时将这些温度曲线拟合到多个斑点大小或/和脉冲持续时间的分析溶液中，可以提取多种热性质以及激光吸收。在我们提出的测量方法中，我们还建立了用于多响应多参数最小二乘拟合的灵敏度和不确定性分析的方法。案例研究表明，瞬态温度曲线通常比可变点大小下的稳态温度对热性能更为敏感。如果同时将多个光斑尺寸的多个瞬态温度曲线同时拟合到分析溶液中，则可以以足够高的精度提取所有未知的热特性和激光吸收。本文介绍的测量方法和不确定性分析方法可用于研究新兴的2D材料和vdW异质结构中的热传递。

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