Measuring the thermal conductivity and interfacial thermal resistance of suspended MoS2 using electron beam self-heating technique

TL;DR

This study applies an electron beam self-heating technique to measure the intrinsic thermal conductivity of suspended MoS2 and its interfacial thermal resistance with electrodes, providing insights into thermal transport in 2D materials.

Contribution

It introduces a method to accurately measure thermal conductivity and interfacial thermal resistance of suspended MoS2 using electron beam self-heating, extending its application to layered 2D materials.

Findings

Thermal conductivity of MoS2 is around 30 W/mK.

Interfacial thermal resistance is approximately 2×10⁻⁶ m²K/W.

Technique can be applied to study thermal properties of 2D heterojunctions.

Abstract

Establishment of a new technique or extension of an existing technique for thermal and thermoelectric measurements to a more challenging system is an important task to explore the thermal and thermoelectric properties of various materials and systems. The bottleneck lies in the challenges in measuring the thermal contact resistance. In this work, we applied electron beam self-heating technique to derive the intrinsic thermal conductivity of suspended Molybdenum Disulfide (MoS2) ribbons and the thermal contact resistance, with which the interfacial thermal resistance between few-layer MoS2 and Pt electrodes was calculated. The measured room temperature thermal conductivity of MoS2 is around 30 W/mK, while the estimated interfacial thermal resistance is around 2*10-6 m2K/W. Our experiments extend a useful branch in application of this technique for studying thermal properties of suspended layered ribbons and have potential application in investigating the interfacial thermal resistance of different 2D heterojunctions.