Isotope-Engineering the Thermal Conductivity of Two-Dimensional MoS2

Li, Xufan; Zhang, Jingjie; Puretzky, Alexander A.; Yoshimura, Anthony; Sang, Xiahan; Cui, Qiannan; Li, Yuanyuan; Liang, Liangbo; Ghosh, Avik W.; Zhao, Hui; Unocic, Raymond R.; Meunier, Vincent; Rouleau, Christopher M.; Sumpter, Bobby; Geohegan, David B.; Xiao, Kai

doi:10.1021/acsnano.8b09448

Title: Isotope-Engineering the Thermal Conductivity of Two-Dimensional MoS₂

Journal Article · Wed Jan 23 00:00:00 EST 2019 · ACS Nano

DOI:https://doi.org/10.1021/acsnano.8b09448· OSTI ID:1528724

^[1]; Zhang, Jingjie ^[2];

^[1]; Yoshimura, Anthony ^[3];

^[1]; Cui, Qiannan ^[4]; Li, Yuanyuan ^[4];

^[1]; Ghosh, Avik W. ^[5];

^[4];

^[1]; Meunier, Vincent ^[3];

^[1];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Virginia, Charlottesville, VA (United States)
Rensselaer Polytechnic Inst., Troy, NY (United States)
Univ. of Kansas, Lawrence, KS (United States)
Univ. of Virginia, Charlottesville, VA (United States)

Isotopes represent a degree of freedom that might be exploited to tune the physical properties of materials while preserving their chemical behaviors. In this work, we demonstrate that the thermal properties of two-dimensional (2D) transition-metal dichalcogenides can be tailored through isotope engineering. Monolayer crystals of MoS₂ were synthesized with isotopically pure ¹⁰⁰Mo and ⁹²Mo by chemical vapor deposition employing isotopically enriched molybdenum oxide precursors. The in-plane thermal conductivity of the ¹⁰⁰MoS₂ monolayers, measured using a non-destructive, optothermal Raman technique, is found to be enhanced by ~50% compared with the MoS₂ synthesized using mixed Mo isotopes from naturally occurring molybdenum oxide. The boost of thermal conductivity in isotopically pure MoS₂ monolayers is attributed to the combined effects of reduced isotopic disorder and a reduction in defect-related scattering, consistent with observed stronger photoluminescence and longer exciton lifetime. Finally, these results shed light on the fundamentals of 2D nanoscale thermal transport important for the optimization of 2D electronic devices.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1528724

Journal Information:: ACS Nano, Vol. 13, Issue 2; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 42 works

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