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A Moiré Superlattice Induced Thermal Switch for Modulating Interfacial Heat Transfer.
Yun Dong1, Chunjie Zhang1, Yi Tao2
1School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
ACS Applied Materials & Interfaces
|August 4, 2025
Summary
We developed a moiré superlattice heat switch to control heat flow. Adjusting the twist angle and temperature significantly alters heat transfer efficiency by managing atomic stress and scattering.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Controlling heat transfer at interfaces is crucial for thermal management in electronic devices.
- Moiré superlattices offer tunable electronic and physical properties based on their structure.
Purpose of the Study:
- To investigate the regulation of interfacial thermal conductance (ITC) using a moiré superlattice heat switch.
- To understand the influence of twist angle, temperature, and normal load on ITC.
Main Methods:
- Fabrication of a heat switch utilizing moiré superlattice principles.
- Experimental measurement of ITC under varying twist angles, temperatures, and applied normal loads.
Main Results:
- Interfacial thermal conductance (ITC) decreases significantly with increasing twist angle.
- ITC exhibits nonmonotonic behavior with temperature, influenced by competing factors.
- Higher normal loads shift the temperature threshold for nonmonotonic ITC variations.
Conclusions:
- Moiré superlattices provide a novel mechanism for actively controlling interfacial thermal conductance.
- The interplay between structural fluctuations, atomic stress, and thermal expansion dictates heat transfer efficiency.
- This technology holds potential for advanced thermal management solutions.
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