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Volume 4 Issue 3
Apr.  2022
Article Contents

Zobeiri H, Hunter N, Xu S, Xie Y S, Wang X W. 2022. Robust and high-sensitivity thermal probing at the nanoscale based on resonance Raman ratio (R3). Int. J. Extrem. Manuf. 4 035201.
Citation: Zobeiri H, Hunter N, Xu S, Xie Y S, Wang X W. 2022. Robust and high-sensitivity thermal probing at the nanoscale based on resonance Raman ratio (R3). Int. J. Extrem. Manuf. 035201.

Robust and high-sensitivity thermal probing at the nanoscale based on resonance Raman ratio (R3)


doi: 10.1088/2631-7990/ac6cb1
More Information
  • Publish Date: 2022-04-26
  • Fund Project:

    Support of this work by National Science Foundation (CBET1930866 and CMMI2032464 for X W) and National Natural Science Foundation of China (No. 52106220 for S X and No. 51906161 for Y X) is gratefully acknowledged.

  • Raman spectroscopy-based temperature sensing usually tracks the change of Raman wavenumber, linewidth and intensity, and has found very broad applications in characterizing the energy and charge transport in nanomaterials over the last decade. The temperature coefficients of these Raman properties are highly material-dependent, and are subjected to local optical scattering influence. As a result, Raman-based temperature sensing usually suffers quite large uncertainties and has low sensitivity. Here, a novel method based on dual resonance Raman phenomenon is developed to precisely measure the absolute temperature rise of nanomaterial (nm WS2 film in this work) from 170 to 470 K. A 532 nm laser (2.33 eV photon energy) is used to conduct the Raman experiment. Its photon energy is very close to the excitonic transition energy of WS2 at temperatures close to room temperature. A parameter, termed resonance Raman ratio (R3) Ω = IA1g/IE2g is introduced to combine the temperature effects on resonance Raman scattering for the A1g and E2g modes. Ω has a change of more than two orders of magnitude from 177 to 477 K, and such change is independent of film thickness and local optical scattering. It is shown that when Ω is varied by 1%, the temperature probing sensitivity is 0.42 K and 1.16 K at low and high temperatures, respectively. Based on Ω, the in-plane thermal conductivity (k) of a ∼25 nm-thick suspended WS2 film is measured using our energy transport state-resolved Raman (ET-Raman). k is found decreasing from 50.0 to 20.0 Wm−1 K−1 when temperature increases from 170 to 470 K. This agrees with previous experimental and theoretical results and the measurement data using our FET-Raman. The R3 technique provides a very robust and high-sensitivity method for temperature probing of nanomaterials and will have broad applications in nanoscale thermal transport characterization, non-destructive evaluation, and manufacturing monitoring.

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Robust and high-sensitivity thermal probing at the nanoscale based on resonance Raman ratio (R3)

doi: 10.1088/2631-7990/ac6cb1
  • 1 Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, United States of America
  • 2 School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People’s Republic of China
  • 3 College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong 518055, People’s Republic of China
  • 4 These authors contributed equally to this work
Fund Project:

Support of this work by National Science Foundation (CBET1930866 and CMMI2032464 for X W) and National Natural Science Foundation of China (No. 52106220 for S X and No. 51906161 for Y X) is gratefully acknowledged.

Abstract: 

Raman spectroscopy-based temperature sensing usually tracks the change of Raman wavenumber, linewidth and intensity, and has found very broad applications in characterizing the energy and charge transport in nanomaterials over the last decade. The temperature coefficients of these Raman properties are highly material-dependent, and are subjected to local optical scattering influence. As a result, Raman-based temperature sensing usually suffers quite large uncertainties and has low sensitivity. Here, a novel method based on dual resonance Raman phenomenon is developed to precisely measure the absolute temperature rise of nanomaterial (nm WS2 film in this work) from 170 to 470 K. A 532 nm laser (2.33 eV photon energy) is used to conduct the Raman experiment. Its photon energy is very close to the excitonic transition energy of WS2 at temperatures close to room temperature. A parameter, termed resonance Raman ratio (R3) Ω = IA1g/IE2g is introduced to combine the temperature effects on resonance Raman scattering for the A1g and E2g modes. Ω has a change of more than two orders of magnitude from 177 to 477 K, and such change is independent of film thickness and local optical scattering. It is shown that when Ω is varied by 1%, the temperature probing sensitivity is 0.42 K and 1.16 K at low and high temperatures, respectively. Based on Ω, the in-plane thermal conductivity (k) of a ∼25 nm-thick suspended WS2 film is measured using our energy transport state-resolved Raman (ET-Raman). k is found decreasing from 50.0 to 20.0 Wm−1 K−1 when temperature increases from 170 to 470 K. This agrees with previous experimental and theoretical results and the measurement data using our FET-Raman. The R3 technique provides a very robust and high-sensitivity method for temperature probing of nanomaterials and will have broad applications in nanoscale thermal transport characterization, non-destructive evaluation, and manufacturing monitoring.

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