Giant Thermal Rectification from Single-Carbon Nanotube-Graphene Junction.
Giant Thermal Rectification from Single-Carbon Nanotube-Graphene Junction.
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DOI：
10.1021/acsami.7b04464
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发表时间：
2017-07
影响因子：
9.5
通讯作者：
Xueming Yang;D. Yu;B. Cao
中科院分区：
文献类型：
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作者：
Xueming Yang;D. Yu;B. Cao
我们描述了几何参数对单碳纳米管-石墨烯结热整流的影响。计算并显示了热整流的二维分布与石墨烯纳米片的管长和边长的关系。设计的单碳纳米管-石墨烯结在平均温度为300 K和200 K时的最大热整流率分别达到1244.1%和1681.6%。这些数值远远高于基于单材料纳米结构的热整流器。纳米管-石墨烯结的热整流比对几何尺寸相当敏感，并且几乎完全由负热偏压下功率谱的重叠程度决定。这些发现可以为热二极管的设计和性能改进提供有用的指导。
We describe the influence of the geometry parameters on the thermal rectification of single-carbon nanotube-graphene junction. The two-dimensional (2D) distribution of the thermal rectification with respect to the tube length and the side length of the graphene nanosheet are calculated and visualized. The maximum thermal rectification ratios of the designed single-carbon nanotube-graphene junction can reach 1244.1% and 1681.6% at average temperatures of 300 and 200 K, respectively. These values are much higher than those reported for single-material nanostructure-based thermal rectifiers. The thermal rectification ratios of the nanotube-graphene junction are fairly sensitive to geometry size and are almost entirely dominated by the degree of overlap of the power spectra under negative thermal bias. These findings could offer useful guidelines for the design and performance improvement of thermal diodes.