Thermal conductivity of suspended few-layer MoS₂

Area of Science:

• Materials Science
• Nanotechnology
• Condensed Matter Physics

Background:

• Tailoring phonon thermal conductivity in nanomaterials is crucial for fundamental science and applications.
• Experimental control over nanoscale thermal properties, particularly in 2D materials, remains challenging.

Purpose of the Study:

• To demonstrate in situ thermal conduction measurement of molybdenum disulfide (MoS2).
• To show that MoS2 thermal conductivity can be continuously tuned between crystalline and amorphous states.

Main Methods:

• In situ measurement of thermal conduction in MoS2.
• Analysis of phonon-defect scattering and its effect on phonon transmission.
• Observation of crystalline-amorphous transitions.

Main Results:

• Achieved continuous tuning of MoS2 thermal conductivity.
• Identified phonon-defect scattering as the mechanism for conductivity reduction.
• Observed a sharp drop in thermal conductivity attributed to a crystalline-amorphous transition.

Conclusions:

• The developed method allows precise control over MoS2 thermal conductivity.
• Results provide insights into phonon transport in 2D materials.
• Findings guide thermal management strategies for thermoelectrics, photoelectronics, and energy harvesting devices.