Measuring the thermal conductivity of a single carbon nanotube
Measuring the thermal conductivity of a single carbon nanotube
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DOI：
10.1103/physrevlett.95.065502
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发表时间：
2005-08-05
影响因子：
8.6
通讯作者：
Shimizu, T
中科院分区：
文献类型：
--
作者：
Fujii, M;Zhang, X;Shimizu, T
虽然毫米尺寸的碳纳米管垫和填充的碳纳米纤维的热性能已经很容易测量，但单个纳米管的测量是非常困难的。在这里，我们报告了一种新的方法，可以可靠地测量单个碳纳米管的热导率，使用悬浮样品附着的t型纳米传感器。实验结果表明，碳纳米管在室温下的导热系数随直径的减小而增大，当直径为9.8 nm时，其导热系数超过2000 W/mK。直径为16.1 nm的碳纳米管的热导率的温度依赖性在320 K附近有渐近线。本方法原则上适用于任何种类的单纳米纤维、纳米线，甚至单壁碳纳米管。
Although the thermal properties of millimeter-sized carbon nanotube mats and packed carbon nanofibers have been readily measured, measurements for a single nanotube are extremely difficult. Here, we report a novel method that can reliably measure the thermal conductivity of a single carbon nanotube using a suspended sample-attached T-type nanosensor. Our experimental results show that the thermal conductivity of a carbon nanotube at room temperature increases as its diameter decreases, and exceeds 2000 W/mK for a diameter of 9.8 nm. The temperature dependence of the thermal conductivity for a carbon nanotube with a diameter of 16.1 nm appears to have an asymptote near 320 K. The present method is, in principle, applicable to any kind of a single nanofiber, nanowire, and even single-walled carbon nanotube.