Edge effect on phonon transport in suspended and supported graphene nanoribbons

Masanari Kimura, Takafumi Matsuzaki, Koji Takahashi

研究成果: Contribution to journalArticle査読

抄録

Heat conduction in a graphene nanoribbon (GNR) is investigated using nonequilibrium molecular dynamics simulation. GNR shows an intriguing dependence of thermal conductivity on its width, length, and edge shape. For example, thermal conductivity of thin armchair GNR is about three times lower than that of zigzag GNR due to the strong phonon scattering at the armchair edge. The substrate interaction is another critical issue for phonon transport. GNR supported on a substrate is analyzed by using the Lennard-Jones potential, and the thermal conductivity of a zigzag ribbon is found to decrease significantly due to phonon scattering by the substrate. However, under the same conditions, that of armchair ribbon is not affected by the substrate or even increases. This phenomenon is caused by the suppression of edge-localized flexural phonons of armchair GNR, which triggers their smaller thermal conductivity than the zigzag one. This anomalous edge-substrate combined effect on thermal transport in supported GNR is discussed.

本文言語英語
ページ(範囲)193-199
ページ数7
ジャーナルComputational Thermal Sciences
4
3
DOI
出版ステータス出版済み - 2012

All Science Journal Classification (ASJC) codes

  • エネルギー工学および電力技術
  • 表面および界面
  • 流体および伝熱
  • 計算数学

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