Thermal transport in bent graphene nanoribbons.
Thermal transport in bent graphene nanoribbons.
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DOI：
10.1039/c2nr31966g
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发表时间：
2013-01
期刊：
影响因子：
6.7
通讯作者：
Jingchao Zhang;Xinwei Wang
中科院分区：
文献类型：
--
作者：
Jingchao Zhang;Xinwei Wang
本文报道了弯曲石墨烯纳米带中声子行为和热输运的研究。在弯曲gnr中，热输运过程中观察到三种特殊现象。首先，由于gnr中弯曲模（ZM）声子的高导热性，在系统施加稳态热通量后，可以观察到面内和面外声子模式之间的能量分离。这样的能量分离距离加热区域可以保持约50纳米。其次，在90°弯曲GNR系统的弯曲区域观察到热阻。这种现象可以用声子能量散射/反射和弯曲结构中的压缩应变来解释。研究了不同的弯曲角度，证明了弯曲阻力随弯曲角度的增大而减小。最后，在穿过gnr中的弯曲结构时，声子包保持其振动模式而不是振动方向。
This work reports on a study of the phonon behavior and thermal transport in bent graphene nanoribbons (GNRs). Three peculiar phenomena are observed in bent GNRs during thermal transport. First, due to the high thermal conductivity of flexural mode (ZM) phonons in GNRs, energy separation is observed between the in-plane and out-of-plane phonon modes after a steady state heat flux is imposed on the system. Such energy separation can hold for about 50 nm from the heating region. Second, a thermal resistance is observed in the bending region of a 90° bent GNR system. This phenomenon is explained by the phonon energy scattering/reflection and the compressive strain in the bending structure. Different bending angles are investigated and it is proved that the bending resistance decreases with increasing bending angle. Finally, upon crossing the bending structure in GNRs, phonon packages preserve their vibrating mode instead of vibrating directions.