Temperature-dependent thermal properties of supported MoS2 monolayers

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) materials, like molybdenum disulfide (MoS2), offer unique electronic and optoelectronic properties.
• Thermal properties are critical for the performance and stability of devices utilizing 2D materials.
• Understanding temperature-dependent thermal behavior is essential for designing reliable 2D material-based electronics.

Purpose of the Study:

• To investigate the temperature-dependent thermal conductivity of molybdenum disulfide (MoS2) monolayers.
• To measure the interfacial thermal conductance between MoS2 monolayers and SiO2/Si substrates.
• To elucidate the impact of temperature on heat transport in 2D material systems.

Main Methods:

• Utilized Raman spectroscopy to probe thermal properties.
• Fabricated MoS2 monolayers on SiO2/Si substrates.
• Analyzed temperature-dependent spectral shifts to extract thermal parameters.

Main Results:

• Observed a significant decrease in thermal conductivity (κ) with increasing temperature.
• Measured interfacial thermal conductance (g) also decreased as temperature rose.
• Reported κ values from 62.2 W m(-1) K(-1) at 300 K to 7.45 W m(-1) K(-1) at 450 K.
• Reported g values from 1.94 MW m(-2) K(-1) at 300 K to 1.25 MW m(-2) K(-1) at 450 K.

Conclusions:

• Temperature negatively impacts both intrinsic thermal conductivity of MoS2 monolayers and their interfacial thermal conductance.
• Findings highlight the importance of temperature management in MoS2-based electronic and optoelectronic devices.
• Provides crucial data for thermal modeling and device optimization in 2D material applications.