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Phonon transport effects in one-dimensional width-modulated graphene nanoribbons
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Karamitaheri, Hossein and Neophytou, Neophytos (2016) Phonon transport effects in one-dimensional width-modulated graphene nanoribbons. Journal of Applied Physics, 119 (24). 244302. doi:10.1063/1.4954021 ISSN 0021-8979.
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Official URL: http://dx.doi.org/10.1063/1.4954021
Abstract
We investigate the thermal conductance of one-dimensional periodic width-modulated graphene nanoribbons using lattice dynamics for the phonon spectrum and the Landauer formalism for phonon transport. We conduct a full investigation considering all relevant geometrical features, i.e., the various lengths and widths of the narrow and wide regions that form the channel. In all cases that we examine, we find that width-modulation suppresses the thermal conductance at values even up to ∼70% below those of the corresponding uniform narrow nanoribbon. We show that this can be explained by the fact that the phonon spectrum of the width-modulated channels acquires less dispersive bands with lower group velocities and several narrow bandgaps, which reduce the phonon transmission function significantly. The largest degradation in thermal conductance is determined by the geometry of the narrow regions. The geometry of the wider regions also influences thermal conductance, although modestly. Our results add to the ongoing efforts in understanding the details of phonon transport at the nanoscale, and our conclusions are generic and could also apply to other one-dimensional channel materials.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||
| Library of Congress Subject Headings (LCSH): | Phonons, Graphene , Thermal conductivity | ||||||||
| Journal or Publication Title: | Journal of Applied Physics | ||||||||
| Publisher: | American Institute of Physics | ||||||||
| ISSN: | 0021-8979 | ||||||||
| Official Date: | 22 June 2016 | ||||||||
| Dates: |
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| Volume: | 119 | ||||||||
| Number: | 24 | ||||||||
| Article Number: | 244302 | ||||||||
| DOI: | 10.1063/1.4954021 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Date of first compliant deposit: | 30 August 2016 | ||||||||
| Date of first compliant Open Access: | 30 August 2016 |
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