双波长闪光拉曼热扩散率测量系统研发及应用

樊傲然; 马维刚; 王海东; 张兴

doi:10.16511/j.cnki.qhdxxb.2020.25.034

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清华大学学报（自然科学版） ›› 2021, Vol. 61 ›› Issue (12) : 1379-1388. DOI: 10.16511/j.cnki.qhdxxb.2020.25.034

专题：能源动力领域传热与热系统研究

双波长闪光拉曼热扩散率测量系统研发及应用

樊傲然, 马维刚, 王海东, 张兴

作者信息 +

Development and application of dual-wavelength flash Raman measurement system

FAN Aoran, MA Weigang, WANG Haidong, ZHANG Xing

Author information +

文章历史 +

摘要

纳米材料热传递特性的高精度原位测量，是传热学研究中亟待解决的关键问题。拉曼光谱法是目前最理想的纳米尺度非接触式原位测量方法之一，但现有的瞬态拉曼光谱法时间、空间分辨率较低，显著影响了测量精度。该文研发了时间分辨率可达100 ps、空间分辨率可达100 nm的双波长闪光拉曼测量系统：搭建一束较强的脉冲激光加热样品，使用另一束波长不同的、无加热效应的脉冲激光作为探测光，激发待测样品和基底的拉曼光谱，借助拉曼峰位偏移同时测定样品和基底温度。通过调整探测脉冲和加热脉冲之间的时间差，可高时间分辨率地获得样品和基底的温度变化曲线，进而测定纳米材料热扩散率。通过改变探测激光与加热激光的光斑中心距，可高空间分辨率地获得样品温度空间分布，从而进一步提高瞬态测量灵敏度，并可实现对有基底支撑纳米材料与基底之间接触热导的测量。基于上述测量系统，该文测量了有基底支撑双层石墨烯的热传递特性，并与文献结果进行了对比，分析说明了此系统的测量优势。

Abstract

Accurate, in situ measurements of nanomaterial thermophysical properties have become a key heat transfer research problem. Raman-based methods are nearly ideal non-contact methods for nanoscale measurements. However, the limited temporal and spatial resolutions of previous Raman-based methods significantly affected their measurement accuracy. This study developed a dual-wavelength flash Raman measurement system with 100 ps temporal resolution and 100 nm spatial resolution. A pulsed laser was used to heat the sample with another pulsed laser with a different wavelength and negligible heating effect used to excited the Raman scattering to simultaneously measure the sample and substrate temperatures. The time delay between the heating pulse and the probing pulse was varied to measure the transient temperature variations of the sample and substrate to determine the thermal diffusivity of the nanomaterial. The spot center distance between the probing and heating lasers was varied to obtain high spatial resolution temperature distributions to further improve the transient measurement sensitivity and to determine the thermal contact conductance between the substrate supported nanomaterials and the substrate. Measurements of the properties of supported bilayer graphene show the system advantages.

导出引用

樊傲然, 马维刚, 王海东, 张兴. 双波长闪光拉曼热扩散率测量系统研发及应用[J]. 清华大学学报（自然科学版）. 2021, 61(12): 1379-1388 https://doi.org/10.16511/j.cnki.qhdxxb.2020.25.034

FAN Aoran, MA Weigang, WANG Haidong, ZHANG Xing. Development and application of dual-wavelength flash Raman measurement system[J]. Journal of Tsinghua University(Science and Technology). 2021, 61(12): 1379-1388 https://doi.org/10.16511/j.cnki.qhdxxb.2020.25.034

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基金

国家重大科研仪器研制项目（51827807）；国家自然科学基金重点项目（51636002）

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收稿日期	出版日期
2020-05-16	2021-12-11
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2021-12-11

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