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Nano Research 2022, 15(10): 9578-9587 https://doi.org/10.1007/s12274-022-4560-7
Research Article | Issue | Published: 06 July 2022

Reduction in thermal conductivity of monolayer WS2 caused by substrate effect

Show Author's Information Yufeng Zhang1,§,  Qian Lv2,§,  Aoran Fan1,  Lingxiao Yu2,  Haidong Wang1,  Weigang Ma1,  Ruitao Lv2,3( ),  Xing Zhang1( )
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

§ Yufeng Zhang and Qian Lv contributed equally to this work.

Keywords:
thermal conductivity, monolayer WS2, temperature effect, substrate effect, dual-wavelength flash Raman (DF-Raman) method
Topics:
Semiconducting films
Cite this article:
Zhang Y, Lv Q, Fan A, et al. Reduction in thermal conductivity of monolayer WS2 caused by substrate effect. Nano Research, 2022, 15(10): 9578-9587. https://doi.org/10.1007/s12274-022-4560-7
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Abstract Full text Electronic supplementary material About this article

Understanding the substrate and temperature effect on thermal transport properties of transition metal dichalcogenides (TMDs) monolayers are crucial for their future applications. Herein, a dual-wavelength flash Raman (DF-Raman) method is used to measure the thermal conductivity of monolayer WS2 at a temperature range of 200–400 K. High measurement accuracy can be guaranteed in this method since the influence of both the laser absorption coefficient and temperature-Raman coefficient can be eliminated through normalization. The room-temperature thermal conductivity of suspended and supported WS2 are 28.5 ± 2.1 (30.3 ± 2.0) and 15.4 ± 1.9 (16.9 ± 2.1) W/(m·K), respectively, with a ~ 50% reduction due to substrate effect. Molecular dynamics (MD) simulations reveal that the suppression of acoustic phonons is mainly responsible for the striking reduction. The behaviors of optical phonons are also unambiguously investigated using Raman spectroscopy, and the in-plane optical mode, E 2g1(Γ), is surprisingly found to be slightly enhanced while out-of-plane mode, A1g(Γ), is suppressed due to substrate interaction, mutually verified with MD results. Our study provides a solid understanding of the phonon transport behavior of WS2 with substrate interaction, which provides guidance for TMDs-based nanodevices.


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Electronic supplementary material
About this article

Reduction in thermal conductivity of monolayer WS2 caused by substrate effect

Show Author's information Yufeng Zhang1,§, Qian Lv2,§, Aoran Fan1, Lingxiao Yu2, Haidong Wang1, Weigang Ma1, Ruitao Lv2,3( ), Xing Zhang1( )
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

§ Yufeng Zhang and Qian Lv contributed equally to this work.

Abstract

Understanding the substrate and temperature effect on thermal transport properties of transition metal dichalcogenides (TMDs) monolayers are crucial for their future applications. Herein, a dual-wavelength flash Raman (DF-Raman) method is used to measure the thermal conductivity of monolayer WS2 at a temperature range of 200–400 K. High measurement accuracy can be guaranteed in this method since the influence of both the laser absorption coefficient and temperature-Raman coefficient can be eliminated through normalization. The room-temperature thermal conductivity of suspended and supported WS2 are 28.5 ± 2.1 (30.3 ± 2.0) and 15.4 ± 1.9 (16.9 ± 2.1) W/(m·K), respectively, with a ~ 50% reduction due to substrate effect. Molecular dynamics (MD) simulations reveal that the suppression of acoustic phonons is mainly responsible for the striking reduction. The behaviors of optical phonons are also unambiguously investigated using Raman spectroscopy, and the in-plane optical mode, E 2g1(Γ), is surprisingly found to be slightly enhanced while out-of-plane mode, A1g(Γ), is suppressed due to substrate interaction, mutually verified with MD results. Our study provides a solid understanding of the phonon transport behavior of WS2 with substrate interaction, which provides guidance for TMDs-based nanodevices.

Keywords: thermal conductivity, monolayer WS2, temperature effect, substrate effect, dual-wavelength flash Raman (DF-Raman) method

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Publication history
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Acknowledgements

Publication history

Received: 14 February 2022
Revised: 16 May 2022
Accepted: 19 May 2022
Published: 06 July 2022
Issue date: October 2022

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© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 51827807, 51972191, and 52130602).

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