Transient thermal characterization of suspended monolayer MoS2

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)
64 Downloads (Pure)

Abstract

We measure the thermal time constants of suspended single-layer molybdenum disulfide drums by their thermomechanical response to a high-frequency modulated laser. From this measurement, the thermal diffusivity of single-layer MoS2 is found to be 1.14×10-5m2/s on average. Using a model for the thermal time constants and a model assuming continuum heat transport, we extract thermal conductivities at room temperature between 10 to 40Wm-1K-1. Significant device-to-device variation in the thermal diffusivity is observed. Based on a statistical analysis we conclude that these variations in thermal diffusivity are caused by microscopic defects that have a large impact on phonon scattering but do not affect the resonance frequency and damping of the membrane's lowest eigenmode. By combining the experimental thermal diffusivity with literature values of the thermal conductivity, a method is presented to determine the specific heat of suspended 2D materials, which is estimated to be 255±104Jkg-1K-1 for single-layer MoS2.

Original languageEnglish
Article number114008
Number of pages8
JournalPhysical Review Materials
Volume2
Issue number11
DOIs
Publication statusPublished - 2018

Fingerprint Dive into the research topics of 'Transient thermal characterization of suspended monolayer MoS2'. Together they form a unique fingerprint.

Cite this