Thermal conductivity of MoS<inf>2</inf> polycrystalline nanomembranes

M. Sledzinska, B. Graczykowski, M. Placidi, D. Saleta Reig, A. El Sachat, J. S. Reparaz, F. Alzina, B. Mortazavi, R. Quey, L. Colombo, S. Roche, C. M.Sotomayor Torres

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    18 Citations (Scopus)

    Abstract

    © 2016 IOP Publishing Ltd. 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.Wereport 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.
    Original languageEnglish
    Article number035016
    Journal2D Materials
    Volume3
    Issue number3
    DOIs
    Publication statusPublished - 7 Sep 2016

    Keywords

    • MoS 2
    • Nanoscale thermal transport
    • Thermal conductivity
    • Ultra-thin membranes

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    Sledzinska, M., Graczykowski, B., Placidi, M., Reig, D. S., El Sachat, A., Reparaz, J. S., Alzina, F., Mortazavi, B., Quey, R., Colombo, L., Roche, S., & Torres, C. M. S. (2016). Thermal conductivity of MoS<inf>2</inf> polycrystalline nanomembranes. 2D Materials, 3(3), [035016]. https://doi.org/10.1088/2053-1583/3/3/035016