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首页> 外文期刊>International Journal of Heat and Mass Transfer >Frequency-domain Raman method to measure thermal diffusivity of one-dimensional microfibers and nanowires
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Frequency-domain Raman method to measure thermal diffusivity of one-dimensional microfibers and nanowires

机译：频域拉曼法测量一维微纤维和纳米线的热扩散率

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摘要

Thermal property measurement of individual micro- and nano-materials has been very challenging and the development of measurement methods is crucial for the experimental investigation of microscale and nanoscale heat transfer. Here we present a noncontact frequency-domain Raman method to measure thermal diffusivity of individual 1D microfibers and nanowires without the need of knowing laser absorptivity. Cosine-wave modulated laser is used to heat the sample, while the laser-intensity-weighted spatiotemporal average temperature is simultaneously detected from the sample's Raman band shift. Transient heat conduction models under periodic heating are established and analytically solved in the frequency domain with considerations of the Gaussian laser distribution and thermal contact resistance. By varying the laser modulation frequency as well as the laser spot size, we can eliminate the laser absorptivity by a normalization technique and extract the thermal diffusivity with high sensitivity. Typically, if the thermal diffusivity is on the order of 10(-4) m(2)/s, we need to use the modulation frequencies on the order of 10 Hz to measure millimeter long microfibers, and similar to MHz frequencies to measure micrometer long nanowires. We also demonstrate that any kind of periodic laser modulation can be decomposed to a series of cosine modes and readily analyzed by this frequency-domain approach, which can greatly broaden the applications of transient Raman techniques. (C) 2019 Elsevier Ltd. All rights reserved.
机译：单个微材料和纳米材料的热性能测量一直非常具有挑战性，测量方法的发展对于微尺度和纳米尺度传热的实验研究至关重要。在这里，我们提出了一种无需接触激光吸收率即可测量单个一维超细纤维和纳米线的热扩散率的非接触式频域拉曼方法。余弦波调制激光用于加热样品，而激光强度加权的时空平均温度可同时从样品的拉曼带移中检测出来。考虑到高斯激光分布和热接触电阻，建立了周期性加热下的瞬态热传导模型，并在频域中进行了解析求解。通过改变激光调制频率和光斑尺寸，我们可以通过归一化技术消除激光的吸收率，并以高灵敏度提取热扩散率。通常，如果热扩散率在10（-4）m（2）/ s的数量级，我们需要使用10 Hz数量级的调制频率来测量毫米长的微纤维，并且类似于MHz频率来测量微米。长纳米线。我们还证明，任何一种周期性激光调制都可以分解为一系列余弦模式，并且可以通过这种频域方法轻松进行分析，这可以极大地扩展瞬态拉曼技术的应用。 （C）2019 Elsevier Ltd.保留所有权利。

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  • 作者

    Li Qin-Yi; Takahashi Koji; Zhang Xing;

  • 作者单位

    Kyushu Univ, Dept Aeronaut & Astronaut, Fukuoka, Fukuoka 8190395, Japan|Kyushu Univ, Int Inst Carbon Neutral Energy Res, WPI 12CNER, Fukuoka, Fukuoka, Japan;

    Kyushu Univ, Dept Aeronaut & Astronaut, Fukuoka, Fukuoka 8190395, Japan|Kyushu Univ, Int Inst Carbon Neutral Energy Res, WPI 12CNER, Fukuoka, Fukuoka, Japan;

    Tsinghua Univ, Key Lab Thermal Sci & Power Engn, Minist Educ, Dept Engn Mech, Beijing 100084, Peoples R China|Kyushu Univ, Int Inst Carbon Neutral Energy Res, WPI 12CNER, Fukuoka, Fukuoka, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Frequency-domain Raman; Thermal diffusivity; Thermal contact resistance; Microfibers; Nanowires;

    机译：频域拉曼热扩散热接触电阻超细纤维纳米线;

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