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SnSe2thermal conductivity from optothermal Raman and Stokes/anti-Stokes thermometry.

Micah P Vallin1,2, Rijan Karkee1, Theresa M Kucinski3

  • 1Center for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States of America.

Nanotechnology
|December 3, 2024
PubMed
Summary
This summary is machine-generated.

We compared two methods for measuring the thermal conductivity of 2D tin diselenide (SnSe2). The Stokes/anti-Stokes thermometry method provided more accurate and precise results than the optothermal Raman method.

Keywords:
2D materialsRaman thermometryanti-Stokes scatteringthermal conductivitythermoelectricstin diselenide

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Determining the in-plane thermal conductivity of two-dimensional (2D) materials is crucial for their application in thermal and electrical energy conversion.
  • Optothermal Raman spectroscopy is a common technique, but its accuracy and precision can be limited.

Purpose of the Study:

  • To compare the optothermal Raman method with the Stokes/anti-Stokes scattering thermometry method for measuring the in-plane thermal conductivity of 2D materials.
  • To evaluate the role of the Stokes/anti-Stokes intensity ratio in determining thermal conductivity.
  • To assess the thermal properties of 2D tin diselenide (SnSe2) on a copper substrate.

Main Methods:

  • Utilized optothermal Raman spectroscopy to measure the in-plane thermal conductivity of 2D SnSe2.
  • Employed Stokes/anti-Stokes scattering thermometry, analyzing the intensity ratio for thermal conductivity extraction and phonon temperature determination.
  • Compared the results obtained from both methods on SnSe2 dry-transferred onto a polished copper substrate.

Main Results:

  • The Stokes/anti-Stokes thermometry method yielded a thermal conductivity of 2.40 ± 0.81 Wm⁻¹K⁻¹, showing higher precision and accuracy than the optothermal Raman method (5.4 ± 3.5 Wm⁻¹K⁻¹).
  • The uncertainty in thermal conductivity measurement was reduced by a factor of 1.9 using the Stokes/anti-Stokes method.
  • 2D SnSe2 exhibited a low in-plane thermal conductivity, 1.3-2.9 times lower than its bulk form.

Conclusions:

  • The Stokes/anti-Stokes thermometry method offers superior precision and accuracy for measuring the in-plane thermal conductivity of 2D materials compared to the traditional optothermal Raman method.
  • The low thermal conductivity of 2D SnSe2 makes it a promising material for thermoelectric devices and thermal management applications.
  • Accurate characterization of thermal properties is essential for optimizing the performance of 2D materials in energy conversion technologies.