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Orientation dependent thermal conductance in single-layer MoS2.

Jin-Wu Jiang1, Xiaoying Zhuang, Timon Rabczuk

  • 1Institute of Structural Mechanics, Bauhaus-University Weimar, Marienstr. 15, D-99423 Weimar, Germany.

Scientific Reports
|July 18, 2013
PubMed
Summary
This summary is machine-generated.

This study reveals significant orientation dependence in molybdenum disulfide (MoS2) nanoribbon thermal conductivity. Zigzag MoS2 nanoribbons exhibit higher thermal conductivity than armchair MoS2 nanoribbons due to more phonon transport channels.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Molybdenum disulfide (MoS2) is a promising 2D material with potential applications in nanoelectronics.
  • Understanding the thermal properties of MoS2 nanoribbons is crucial for their integration into devices.
  • Thermal conductivity in low-dimensional materials can exhibit unique size and orientation effects.

Purpose of the Study:

  • To investigate the thermal conductivity of armchair and zigzag MoS2 nanoribbons.
  • To elucidate the underlying mechanisms responsible for orientation-dependent thermal transport.
  • To compare the thermal conductivity of MoS2 nanoribbons with that of graphene.

Main Methods:

  • First-principles calculations combined with the non-equilibrium Green's function (NEGF) approach.
  • Calculation of Caroli transmission to analyze phonon transport channels.
  • Analysis of phonon dispersion scaling.

Main Results:

  • A strong orientation dependence of thermal conductivity was observed in MoS2 nanoribbons.
  • Thermal conductivity at room temperature was found to be 673.6 Wm(-1)K(-1) for armchair and 841.1 Wm(-1)K(-1) for zigzag nanoribbons.
  • Fewer phonon transport channels in armchair MoS2 nanoribbons within the [150, 200] cm(-1) frequency range were identified as the cause for lower thermal conductivity.

Conclusions:

  • The orientation of MoS2 nanoribbons significantly impacts their thermal conductivity.
  • The observed thermal conductivity of MoS2 nanoribbons is consistent with the high thermal conductivity of graphene.
  • This research provides insights into the thermal transport mechanisms in MoS2 nanoribbons, relevant for thermal management in nanoscale devices.