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Engineering Heat Transport Across Epitaxial Lattice-Mismatched van der Waals Heterointerfaces
Emigdio Chavez-Angel1, Polychronis Tsipas2, Peng Xiao1
1Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, Barcelona 08193, Spain.
Engineered 2D materials create highly insulating thermal metamaterials with ultralow thermal conductivity. These artificial materials offer superior thermal management properties compared to natural ones.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Artificially engineered 2D materials exhibit unique thermal properties for advanced thermal management.
- Van der Waals epitaxy enables the creation of novel heterostructures with tunable characteristics.
Purpose of the Study:
- To engineer and characterize extremely insulating thermal metamaterials using 2D materials.
- To investigate the factors influencing cross-plane heat dissipation in these engineered materials.
Main Methods:
- Van der Waals epitaxy for fabricating Bi2Se3/MoSe2 superlattices and graphene/PdSe2 heterostructures.
- Frequency-domain thermoreflectance and low-frequency Raman spectroscopy for thermal property measurement.
- Tight-binding phonon calculations for theoretical analysis.
Main Results:
- Achieved exceptional thermal resistances (70-202 m2 K/GW) and ultralow cross-plane thermal conductivities (0.012-0.07 W/mK) at room temperature.
- Demonstrated that lattice mismatch, phonon-interface scattering, size effects, and temperature significantly impact heat dissipation.
- Identified the dominant role of long-wavelength phonons in cross-plane thermal transport.
Conclusions:
- Engineered 2D van der Waals heterostructures can achieve amorphous-like thermal insulation.
- Understanding interface effects is crucial for designing materials with tailored thermal transport.
- Provides guidance for developing large-area heteroepitaxial films for thermal management applications.
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