Journal
2D MATERIALS
Volume 3, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/3/3/035016
Keywords
MoS2; thermal conductivity; nanoscale thermal transport; ultra-thin membranes
Categories
Funding
- FP7 project MERGING [309150]
- FP7 project QUANTIHEAT [604668]
- Spanish MICINN project PHENTOM [FIS2015-70862-P]
- program Severo Ochoa [SEV-2013-0295]
- Spanish Ministry of Economy and Competitiveness
- European Regional Development Fund [FIS2015-67767-P]
- program Juan de la Cierva [FPDI-2013-18968]
- ICREA Funding Source: Custom
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Heat conduction in 2D materials can be effectively engineered by means of controlling nanoscale grain structure. Afavorable thermal performance makes these structures excellent candidates for integrated heat management units. Here we show combined experimental and theoretical studies for MoS2 nanosheets in a nanoscale grain-size limit. We report thermal conductivity measurements on 5 nm thick polycrystalline MoS2 by means of 2-laser Raman thermometry. The free-standing, drum-like MoS2 nanomembranes were fabricated using a novel polymer-and residue-free, wet transfer, in which we took advantage of the difference in the surface energies between MoS2 and the growth substrate to transfer the CVD-grown nanosheets. The measurements revealed a strong reduction in the in-plane thermal conductivity down to about 0.73 +/- 0.25 W m(-1) K-1. The results are discussed theoretically using finite elements method simulations for a polycrystalline film, and a scaling trend of the thermally conductivity with grain size is proposed.
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