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Tunable thermal rectification in graphene/hexagonal boron nitride hybrid structures
- Source :
- Journal of Physics D: Applied Physics. 51:085103
- Publication Year :
- 2018
- Publisher :
- IOP Publishing, 2018.
-
Abstract
- Using non-equilibrium molecular dynamics simulations, we investigate thermal rectification (TR) in graphene/hexagonal boron nitride (h-BN) hybrid structures. Two different structural models, partially substituting graphene into h-BN (CBN) and partially substituting h-BN into graphene (BNC), are considered. It is found that CBN has a significant TR effect while that of BNC is very weak. The observed TR phenomenon can be attributed to the resonance effect between out-of-plane phonons of graphene and h-BN domains in the low-frequency region under negative temperature bias. In addition, the influences of ambient temperature, system size, defect number and substrate interaction are also studied to obtain the optimum conditions for TR. More importantly, the TR ratio could be effectively tuned through chemical and structural diversity. A moderate C/BN ratio and parallel arrangement are found to enhance the TR ratio. Detailed phonon spectra analyses are conducted to understand the thermal transport behavior. This work extends hybrid engineering to 2D materials for achieving TR.
- Subjects :
- Work (thermodynamics)
Substrate Interaction
Materials science
Acoustics and Ultrasonics
Phonon
Graphene
Hexagonal boron nitride
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
law.invention
Molecular dynamics
Chemical physics
law
0103 physical sciences
Thermal rectification
Negative temperature
010306 general physics
0210 nano-technology
Subjects
Details
- ISSN :
- 13616463 and 00223727
- Volume :
- 51
- Database :
- OpenAIRE
- Journal :
- Journal of Physics D: Applied Physics
- Accession number :
- edsair.doi...........74b581dab72d4355c13e407780ea4853