Temperature dependence of the thermal conductivity in chiral carbon nanotubes

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dc.contributor.authorMensah, N.G.
dc.contributor.authorNkrumah, G.
dc.contributor.authorMensah, S.Y.
dc.contributor.authorAllotey, F.K.A.
dc.date.accessioned2019-03-14T13:57:41Z
dc.date.available2019-03-14T13:57:41Z
dc.date.issued2004-08
dc.description.abstractThe thermal conductivity of a chiral carbon nanotube (CCNT) is calculated using a tractable analytical approach. This is based on solving the Boltzmann kinetic equation with energy dispersion relation obtained in the tight binding approximation. The results obtained are numerically analysed. Unusually high electron thermal conductivity χ ez is observed along the tubular axis. The dependence of χ ez against temperature T was plotted for varying Δ z and a given Δ s (Δ z and Δ s are the overlapping integrals (exchange energy) for the jumps along the tubular axis and the base helix, respectively). It is noted that χ ez shows a peaking behaviour before falling off at higher temperature. As Δ z varies from 0.010 eV to 0.048 eV for a given Δ s=0.0150 eV, the peak values of χ ez shift from 40000 W/m K at 100 K to 55000 W/m K at about 300 K. Interestingly our results at 104 K which is 41000 W/m K and occurred at Δ z=0.023 eV compares very well with that reported for a 99.9% isotopically enriched 12C diamond crystal. Another interesting result obtained is the fact that the circumferential electron thermal conductivity χ ec appears to be very small. The ratio of χ ez to χ ec is of the order of 2. © 2004 Elsevier B.V. All rights reserved.en_US
dc.identifier.otherhttps://doi.org/10.1016/j.physleta.2004.06.100
dc.identifier.otherVolume 329, Issues 4–5,Pages 369-378
dc.identifier.urihttp://ugspace.ug.edu.gh/handle/123456789/28637
dc.language.isoenen_US
dc.publisherPhysics Letters, Section A: General, Atomic and Solid State Physicsen_US
dc.subjectChiral carbon nanotubeen_US
dc.subjectElectron thermal conductivityen_US
dc.subjectGeometric chiral angleen_US
dc.subjectLattice thermal conductivityen_US
dc.subjectOverlap integralen_US
dc.subjectTubular and circumferential axesen_US
dc.titleTemperature dependence of the thermal conductivity in chiral carbon nanotubesen_US
dc.typeArticleen_US

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