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

Koji Takahashi, Yohei Ito, Tatsuya Ikuta

研究成果: 著書/レポートタイプへの貢献会議での発言

抄録

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.

元の言語英語
ホスト出版物のタイトル2010 14th International Heat Transfer Conference, IHTC 14
ページ331-336
ページ数6
DOI
出版物ステータス出版済み - 12 1 2010
イベント2010 14th International Heat Transfer Conference, IHTC 14 - Washington, DC, 米国
継続期間: 8 8 20108 13 2010

出版物シリーズ

名前2010 14th International Heat Transfer Conference, IHTC 14
6

その他

その他2010 14th International Heat Transfer Conference, IHTC 14
米国
Washington, DC
期間8/8/108/13/10

Fingerprint

Graphite
Ballistics
Graphene
Nanofibers
Thermal conductivity
Van der Waals forces
Carbon nanofibers
Fibers
Molecular dynamics
Sensors
Computer simulation
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes

これを引用

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

A graphene chain acts as a long-distance ballistic heat conductor. / Takahashi, Koji; Ito, Yohei; Ikuta, Tatsuya.

2010 14th International Heat Transfer Conference, IHTC 14. 2010. p. 331-336 (2010 14th International Heat Transfer Conference, IHTC 14; 巻 6).

研究成果: 著書/レポートタイプへの貢献会議での発言

Takahashi, K, Ito, Y & Ikuta, T 2010, A graphene chain acts as a long-distance ballistic heat conductor. : 2010 14th International Heat Transfer Conference, IHTC 14. 2010 14th International Heat Transfer Conference, IHTC 14, 巻. 6, pp. 331-336, 2010 14th International Heat Transfer Conference, IHTC 14, Washington, DC, 米国, 8/8/10. https://doi.org/10.1115/IHTC14-22289
Takahashi K, Ito Y, Ikuta T. A graphene chain acts as a long-distance ballistic heat conductor. : 2010 14th International Heat Transfer Conference, IHTC 14. 2010. p. 331-336. (2010 14th International Heat Transfer Conference, IHTC 14). https://doi.org/10.1115/IHTC14-22289
Takahashi, Koji ; Ito, Yohei ; Ikuta, Tatsuya. / A graphene chain acts as a long-distance ballistic heat conductor. 2010 14th International Heat Transfer Conference, IHTC 14. 2010. pp. 331-336 (2010 14th International Heat Transfer Conference, IHTC 14).
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