Nonlinear thermal conductance in single-wall carbon nanotubes: negative differential thermal resistance.
Nonlinear thermal conductance in single-wall carbon nanotubes: negative differential thermal resistance.
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DOI：
10.1063/1.4776229
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发表时间：
2013-01
期刊：
影响因子：
--
通讯作者：
B. Ai;Meng An;W. Zhong
中科院分区：
文献类型：
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作者：
B. Ai;Meng An;W. Zhong
采用大温差法研究了单壁碳纳米管的非线性热导率。通过经典分子动力学模拟，我们观察到CNTs中存在负差热阻（NDTR），即存在一个温差区域，该区域的热流密度随着外加温差的增大而减小。在一些特殊直径的碳纳米管中甚至出现双NDTRs。随着CNTs长度的增加，NDTR区减小，并在热力学极限下消失。具有NDTR的碳纳米管可能是设计热晶体管、热逻辑门和热存储器等热器件的良好候选材料。
Nonlinear thermal conductance in single-wall carbon nanotubes (CNTs) is investigated by applying the large temperature difference. From the classical molecular dynamics simulations, we observe the occurrence of negative differential thermal resistance (NDTR) in CNTs, namely, there exist a region of temperature difference, where the heat flux decreases as the applied temperature difference increases. Double NDTRs even occur in some CNTs with special diameters. When the length of CNTs increases, NDTR regime reduces and vanishes in the thermodynamic limit. CNTs with NDTR may be the good candidate materials for designing thermal devices such as thermal transistors, thermal logic gates, and thermal memory.