An atomistic study of thermal conductance across a metal-graphene nanoribbon interface
Date of this Version
4-1-2011Citation
J. Appl. Phys. 109, 074305 (2011)
Abstract
This paper presents an atomistic Green's function study of phonon transport through a heterogeneous interface between bulk TiC substrates and graphene nanoribbons (GNRs). The force constants that govern the lattice dynamical equations are obtained from first-principles density functional theory (DFT) calculations and then optimized for the Green's function formulation. Phonon vibrational properties of TiC and GNRs are investigated by lattice dynamics calculations with optimized force constants that correlate well to direct DFT results. Thermal conductances of TiC-GNR-TiC systems are studied together with TiC-GNR structures. The conductances of TiC-GNR interfaces are normalized by ribbon width and are found to converge. The converged value is used to estimate the interface resistance of multiwalled carbon nanotubes (MWCNTs) grown on metal catalyst support substrates and is found to be consistent in an order of magnitude sense with experimental results on MWCNT arrays. The results reveal that covalent bonds may be formed during CNT synthesis and quantify the resulting thermal impedance caused by phonon mismatch. (C) 2011 American Institute of Physics. [doi:10.1063/1.3556454]
Discipline(s)
Nanoscience and Nanotechnology
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Comments
Copyright (2011) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Appl. Phys. 109, 074305 (2011) and may be found at http://dx.doi.org/10.1063/1.3556454. The following article has been submitted to/accepted by Journal of Applied Physics. Copyright (2011) Zhen Huang, Timothy Fisher and Jayathi Murthy. This article is distributed under a Creative Commons Attribution 3.0 Unported License.