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Dual-wavelength flash Raman mapping method for measuring thermal diffusivity of the suspended nanowire

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Abstract

In this paper, we present a dual-wavelength flash Raman (DFR) mapping method for measuring the thermal diffusivity of a suspended nanowire. A heating pulse is used to heat the nanowire sample, and a probing pulse of different wavelength is used to measure the increase in temperature. The laser absorption coefficient can be eliminated by normalization, and the thermal diffusivity of the sample can be extracted from the normalized temperature increase. An infinite heat conduction model is used in this method to avoid the influence of boundary thermal resistance. By changing the position of the probing laser center, the measurement sensitivity of thermal diffusivity can be further improved. The position of maximum sensitivity is influenced by the thermal diffusivity of the nanowire, width of the heating pulse, radius of the heating laser spot, and characteristic length of the sample. To comprehensively analyze the influences of the various parameters, obtain the best measurement conditions, and attain maximum sensitivity, we propose a dimensionless physical model to analyze the heat conduction of the suspended nanowire. Based on the analysis of the best dimensionless parameters, the corresponding appropriate measurement conditions can be determined. Sensitivity analysis shows that when the radius of the heating laser spot is 1% of the length of the nanowire, the sensitivity of the DFR mapping method can be more than four times that of the concentric DFR method for measuring the thermal diffusivity of the nanowire.

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Authors and Affiliations

  1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China

    YuDong Hu, AoRan Fan, HaiDong Wang, WeiGang Ma & Xing Zhang

Authors
  1. YuDong Hu
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  2. AoRan Fan
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  3. HaiDong Wang
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  4. WeiGang Ma
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  5. Xing Zhang
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Corresponding author

Correspondence to Xing Zhang.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51827807 and 51636002).

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Hu, Y., Fan, A., Wang, H. et al. Dual-wavelength flash Raman mapping method for measuring thermal diffusivity of the suspended nanowire. Sci. China Technol. Sci. 63, 748–754 (2020). https://doi.org/10.1007/s11431-019-9558-3

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  • DOI: https://doi.org/10.1007/s11431-019-9558-3

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