Determination of thermal conductivity using micro‐Raman spectroscopy with a three‐dimensional heating model

The thermal conductivity of isotropic graphite was investigated using Raman spectroscopy technique. In this method, the Raman laser acted simultaneously as an excitation source and a heating source. The dependences of the Raman peak position on temperature and laser power for the isotropic graphite...

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Bibliographic Details
Published in:Journal of Raman spectroscopy 2019-12, Vol.50 (12), p.1969-1976
Main Authors: Cao, Fangcheng, He, Zhen
Format: Article
Language:English
Subjects:
Absorptivity
Computer simulation
Graphite
Heat conductivity
Heat transfer
Heating
Irradiation
Laser beam heating
Lasers
proving volume
Raman lasers
Raman shift
Raman spectra
Raman spectroscopy
Spectroscopy
Spectrum analysis
Temperature distribution
Thermal conductivity
three‐dimensional heating model
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Summary:The thermal conductivity of isotropic graphite was investigated using Raman spectroscopy technique. In this method, the Raman laser acted simultaneously as an excitation source and a heating source. The dependences of the Raman peak position on temperature and laser power for the isotropic graphite were analyzed to establish Raman thermometry. Meanwhile, the local temperature rise induced by the laser irradiation was also theoretically described using a three‐dimensional heating model, which can be related to the thermal conductivity. The laser absorptivity, the spot size, and the probing volume of Raman spectra were discussed, respectively. Besides, simulations of the localized temperature distribution were performed. On the basis of the Raman thermometry and the three‐dimensional heating model, the thermal conductivity of 55 W/m K for the isotropic graphite was estimated, which was comparable with the value (60 W/m K) obtained by the laser flash technique. The local temperature rise was evaluated based on the dependences of the Raman peak position on both temperature and laser power. The three‐dimensional heating model was established to estimate the average temperature in Raman probing volume, which is related to the thermal conductivity. On the basis of this work, the thermal conductivity of three‐dimensional materials could be determined using Raman spectroscopy technique.
ISSN:0377-0486
1097-4555
DOI:10.1002/jrs.5725