从光热拉曼和斯托克斯/反斯托克斯温度计的热导率
Micah P Vallin1,2, Rijan Karkee1, Theresa M Kucinski3
1Center for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States of America.
Nanotechnology
|December 3, 2024
概括
我们比较了两种方法来测量二维锡脱化物 (SnSe2) 的导热率. 斯托克斯/反斯托克斯温度计方法提供了比光热拉曼方法更准确和精确的结果.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术 纳米技术
背景情况:
- 确定二维 (2D) 材料的平面内导热率对于它们在热能和电能转换中的应用至关重要.
- 光热拉曼光谱是一种常见的技术,但它的准确性和精度可能是有限的.
研究的目的:
- 将光热拉曼方法与斯托克斯/反斯托克斯散射温度计方法进行比较,用于测量2D材料的平面内导热率.
- 评估Stokes/anti-Stokes强度比在确定导热率中的作用.
- 在铜基板上评估二维锡脱化物 (SnSe2) 的热性能.
主要方法:
- 使用光热拉曼光谱法测量2D SnSe2.2的平面内导热率.
- 采用斯托克斯/反斯托克斯散射温度计,分析热导率提取的强度比和声温度的确定.
- 在干燥转移到抛光的铜基板上的SnSe2上,比较了两种方法获得的结果.
主要成果:
- 斯托克斯/反斯托克斯温度计方法的热导率为2.40±0.81 Wm−1K−1,比光热拉曼法 (5.4±3.5 Wm−1K−1) 的精度和准确度更高.
- 使用Stokes/anti-Stokes方法,测量导热率的不确定性减少了1.9的因素.
- 2D SnSe2 呈现出较低的平面导热率,比其散装形式低1.3-2.9倍.
结论:
- 与传统的光热拉曼法相比,斯托克斯/反斯托克斯温度计方法为测量二维材料的平面内导热率提供了更高的精度和准确性.
- 2D SnSe2 的低导热率使其成为热电设备和热管理应用的有希望的材料.
- 精确的热特性表征对于优化2D材料在能源转换技术中的性能至关重要.
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