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Issue 3, 2018
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Heat flux induced coherent vibration of H-shaped single layer graphene structure

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Abstract

We report an exciting behavior of H-shaped single layer graphene structures subject to a heat flux. H-shaped graphene structures with certain particular dimensions were observed to be able to establish coherent mechanical vibrations in the out-of-plane direction directly from a steady state heat flux flowing from the centerline of the structure towards the two ends. Molecular dynamics (MD) simulation methods together with phonon spectral energy density (SED) analysis techniques were used to obtain the phonon dispersion profiles and identify the low frequency high energy phonon modes. Based on these calculations, we proposed a hypothesis that the mechanical vibration is the result of the superposition of the high energy out-of-plane acoustic (ZA mode) phonons traveling in opposite directions via scattering mechanisms. By using a theoretical model based on the superposition principle, we reproduced the vibrational mode of the graphene structure observed in the MD simulation and verified the proposed hypothesis.

Graphical abstract: Heat flux induced coherent vibration of H-shaped single layer graphene structure

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Publication details

The article was received on 05 Nov 2017, accepted on 15 Dec 2017 and first published on 18 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR08223A
Citation: Nanoscale, 2018,10, 1432-1439
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    Heat flux induced coherent vibration of H-shaped single layer graphene structure

    W. Li, J. Chen, H. Zhao and G. Li, Nanoscale, 2018, 10, 1432
    DOI: 10.1039/C7NR08223A

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