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Journal Article

First-Principle-Based Phonon Transport Properties of Nanoscale Graphene Grain Boundaries

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Sandonas,  Leonardo Medrano
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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http://onlinelibrary.wiley.com/doi/10.1002/advs.201700365/full
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Citation

Sandonas, L. M., Sevincli, H., Gutierrez, R., & Cuniberti, G. (2018). First-Principle-Based Phonon Transport Properties of Nanoscale Graphene Grain Boundaries. Advanced Science, 5(2): 1700365. doi:10.1002/advs.201700365.


Cite as: https://hdl.handle.net/21.11116/0000-0000-D595-7
Abstract
The integrity of phonon transport properties of large graphene (linear and curved) grain boundaries (GBs) is investigated under the influence of structural and dynamical disorder. To do this, density functional tight-binding (DFTB) method is combined with atomistic Green's function technique. The results show that curved GBs have lower thermal conductance than linear GBs. Its magnitude depends on the length of the curvature and out-of-plane structural distortions at the boundary, having stronger influence the latter one. Moreover, it is found that by increasing the defects at the boundary, the transport properties can strongly be reduced in comparison to the effect produced by heating up the boundary region. This is due to the large reduction of the phonon transmission for in-plane and out-of-plane vibrational modes after increasing the structural disorder in the GBs.