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Issue 9, 2017
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Lateral and flexural phonon thermal transport in graphene and stanene bilayers

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Abstract

Stanene, a low thermal conductivity two-dimensional (2D) sheet composed of group-IV element Sn, is a prototype material with novel properties such as 2D topological insulating behavior and near-room-temperature quantum Hall effects. Monolayer graphene, on the other hand, possesses unusual thermal properties, but has a zero bandgap. By stacking stanene and graphene monolayers vertically into a hetero-bilayer, an indirect bandgap can be obtained, making the hetero-bilayer a good candidate for special applications. In this work, the in-plane thermal conductivity (κ) and out-of-plane interfacial thermal resistance (R) in the hetero-bilayer are systematically investigated using non-equilibrium molecular dynamics and transient pump–probe methods. Effects of dimension, system temperature and van der Waals coupling strength on the thermal properties are examined. The predicted in-plane thermal conductivity of the graphene/stanene hetero-bilayer is 311.1 W m−1 K−1, higher than most 2D materials such as phosphorene, hexagonal boron nitride (h-BN), MoS2 and MoSe2. Phonon power spectra are recorded for graphene and stanene individually to help the explanation of their κ difference. The inter-layer thermal resistance between graphene and stanene hetero-bilayers is predicted to be 2.13 × 10−7 K m2 W−1, which is on the same order of magnitude as several other 2D bilayer structures.

Graphical abstract: Lateral and flexural phonon thermal transport in graphene and stanene bilayers

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Publication details

The article was received on 03 Dec 2016, accepted on 02 Feb 2017 and first published on 02 Feb 2017


Article type: Paper
DOI: 10.1039/C6CP08276A
Citation: Phys. Chem. Chem. Phys., 2017,19, 6554-6562
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    Lateral and flexural phonon thermal transport in graphene and stanene bilayers

    Y. Hong, C. Zhu, M. Ju, J. Zhang and X. C. Zeng, Phys. Chem. Chem. Phys., 2017, 19, 6554
    DOI: 10.1039/C6CP08276A

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