Effect of substrate modes on thermal transport in supported graphene
228 citations recorded by the source corpus.
We examine thermaltransportingraphenesupportedonSiO2 usingmolecular dynamics simulations.Coupling to the substrate reduces the thermal conductivity (TC) of supported graphene by an order of magnitude, due to damping of the flexural acoustic (ZA) phonons. However, increasing the strength of the graphene-substrate interaction enhances the heat flow and effective TC along supported graphene, contrary to expectations. The enhancement is due to the coupling of graphene ZA modes to the substrate Rayleigh waves, which linearizes the dispersion and increases the group velocity of the hybridized modes. These findings suggest that the TC of two-dimensional supported graphene is tunable through surface interactions, providing an interesting route for controlled energy flow in nanomaterials.
Subfields: Civil and Structural Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/e39e0987f06b0e740ea15f80ea9494d842c9c701
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In Civil and Structural Engineering
- Gang Zhang
- Yong‐Wei Zhang
- Baowen Li
- Xiaokun Gu
- Alexander A. Balandin
- Xiaobo Yin
- Yujie Wei
- Denis L. Nika
In Materials Chemistry
Citations in the corpus
- Graphene Thermal Properties: Applications in Thermal Management and Energy Storage (2014, background): “Some researchers argued that LA and TA phonons carry most of the heat in suspended graphene [41–43,49,72,84,85], while others suggested that ZA modes are dominate heat carriers [37,54,55,60,96].”
- Colloquium: Phononic thermal properties of two-dimensional materials (2017, methodology): “For example, Ong and Pop (2011) found that when the strength of graphene-substrate interaction is increased by 2 orders of magnitude, heat flow along supported graphene (or equivalently its thermal conductivity) increases by up to 3 times.”
- Strain effects on thermoelectric properties of two-dimensional materials (2015, background): “graphene-substrate [90-92] and layer-layer [93] interactions were also found to have significant impacts on the thermal conductivity due to additional phonon-phonon scattering.”