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Research Article

Reduction in thermal conductivity of monolayer WS2 caused by substrate effect

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.

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Graphical Abstract

A significant reduction in thermal conductivity was observed in supported monolayer WS2 at 200–400 K by dual-wavelength flash Raman method. The molecular dynamics simulation and Raman study mutually demonstrated the suppression of acoustic phonons and the peculiar behavior of optical phonons induced by substrate effect.

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

monolayer WS2thermal conductivitysubstrate effecttemperature effectdual-wavelength flash Raman (DF-Raman) method

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Nano Research
Volume 15 Issue 10,
October 2022
Pages 9578-9587
DOI: 10.1007/s12274-022-4560-7
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
Topics:
Semiconducting films

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Received: 14 February 2022
Revised: 16 May 2022
Accepted: 19 May 2022
Published: 06 July 2022
© Tsinghua University Press 2022
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