Please use this identifier to cite or link to this item: https://doi.org/10.1088/0953-8984/24/29/295403
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dc.titleDimensional crossover of thermal conductance in graphene nanoribbons: A first-principles approach
dc.contributor.authorWang, J.
dc.contributor.authorWang, X.-M.
dc.contributor.authorChen, Y.-F.
dc.contributor.authorWang, J.-S.
dc.date.accessioned2014-10-16T09:21:01Z
dc.date.available2014-10-16T09:21:01Z
dc.date.issued2012-07-25
dc.identifier.citationWang, J., Wang, X.-M., Chen, Y.-F., Wang, J.-S. (2012-07-25). Dimensional crossover of thermal conductance in graphene nanoribbons: A first-principles approach. Journal of Physics Condensed Matter 24 (29) : -. ScholarBank@NUS Repository. https://doi.org/10.1088/0953-8984/24/29/295403
dc.identifier.issn09538984
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/96228
dc.description.abstractFirst-principles density-functional calculations are performed to investigate the thermal transport properties in graphene nanoribbons (GNRs). The dimensional crossover of thermal conductance from one to two dimensions (2D) is clearly demonstrated with increasing ribbon width. The thermal conductance of GNRs of a few nanometers width already exhibits an approximate low-temperature dependence of T 1.5, like that of 2D graphene sheets which is attributed to the quadratic nature of the dispersion relation for the out-of-plane acoustic phonon modes. Using a zone-folding method, we heuristically derive the dimensional crossover of thermal conductance with the increase of ribbon width. Combining our calculations with the experimental phonon mean-free path, some typical values of thermal conductivity at room temperature are estimated for GNRs and for 2D graphene sheet. Our findings clarify the issue of the low-temperature dependence of thermal transport in GNRs and suggest a calibration range of thermal conductivity for experimental measurements in graphene-based materials. © 2012 IOP Publishing Ltd.
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1088/0953-8984/24/29/295403
dc.description.sourcetitleJournal of Physics Condensed Matter
dc.description.volume24
dc.description.issue29
dc.description.page-
dc.description.codenJCOME
dc.identifier.isiut000306270700014
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