A graphene chain acts as a long-distance ballistic heat conductor

Koji Takahashi, Yohei Ito, Tatsuya Ikuta

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A carbon nanofiber material, consisting of bottomless graphene cups inside on each other in a line, like a set of soft-drink cups, has been discovered to have the potential to conduct heat ballistically over a long distance. Its longitudinal heat transport ability had been forecast to be extremely poor due to the weak van der Waals force operating between the graphene cups, but our measurements using nano thermal sensor showed that its thermal conductivity is much higher than that along the c-axis of bulk graphite. This unexpected result can be understood by its similarity to a one-dimensional (1D) harmonic-chain where no phonon is scattered even for an infinite length. The current graphene-based nanofiber resembles this type of "superconductive" chain due to the huge difference between the stiff covalent bonding in each cup and the weak inter-cup interaction. A non-equilibrium molecular dynamics simulation is conducted to explore the phonon transport in this fiber. The simulation results show that the thermal conductivity varies with the fiber length in a power law fashion with an exponent as large as 0.7. The calculated phonon density of states and atomic motions indicate that a low-frequency quasi-1D oscillation occurs there. Our investigations show that treating the current nanofiber as a 1D chain with three-dimensional oscillations explains well why this material has the most effective ballistic phonon transport ever observed.

Original languageEnglish
Title of host publication2010 14th International Heat Transfer Conference, IHTC 14
Pages331-336
Number of pages6
DOIs
Publication statusPublished - Dec 1 2010
Event2010 14th International Heat Transfer Conference, IHTC 14 - Washington, DC, United States
Duration: Aug 8 2010Aug 13 2010

Publication series

Name2010 14th International Heat Transfer Conference, IHTC 14
Volume6

Other

Other2010 14th International Heat Transfer Conference, IHTC 14
CountryUnited States
CityWashington, DC
Period8/8/108/13/10

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes

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  • Cite this

    Takahashi, K., Ito, Y., & Ikuta, T. (2010). A graphene chain acts as a long-distance ballistic heat conductor. In 2010 14th International Heat Transfer Conference, IHTC 14 (pp. 331-336). (2010 14th International Heat Transfer Conference, IHTC 14; Vol. 6). https://doi.org/10.1115/IHTC14-22289