Development and application of dual-wavelength flash Raman measurement system
FAN Aoran, MA Weigang, WANG Haidong, ZHANG Xing
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
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.
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.
FAN Aoran, MA Weigang, WANG Haidong, ZHANG Xing. Development and application of dual-wavelength flash Raman measurement system. Journal of Tsinghua University(Science and Technology), 2021, 61(12): 1379-1388.
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2021, Vol. 61 
