Thermal conductance of an individual single-wall carbon nanotube above room temperature
Thermal conductance of an individual single-wall carbon nanotube above room temperature
复制标题
DOI：
10.1021/nl052145f
复制
发表时间：
2006-01-01
期刊：
影响因子：
10.8
通讯作者：
Dai, HJ
中科院分区：
文献类型：
--
作者：
Pop, E;Mann, D;Dai, HJ
悬浮的金属单壁碳纳米管（SWNT）的热性能提取其高偏压（1-V）的电气特性在300-800 K的温度范围内，通过焦耳自加热实现。对于长2.6 μ m、直径1.7 nm的单壁碳纳米管，其热导率约为2.4 nW/K，室温下的热导率接近3500 Wm（-1）K（-1）。在温度范围的上端，观察到热导率的微妙下降陡于1/T，这是由于两个声学模式和一个光学模式之间的二阶三声子散射。我们讨论了不确定性的来源，并提出了一个简单的分析模型，包括长度和温度依赖性的单壁碳纳米管的热导率。
The thermal properties of a suspended metallic single-wall carbon nanotube (SWNT) are extracted from its high-bias (l-V) electrical characteristics over the 300-800 K temperature range, achieved by Joule self-heating. The thermal conductance is approximately 2.4 nW/K, and the thermal-conductivity is nearly 3500 Wm(-1)K(-1) at room temperature for a SWNT of length 2.6 mu m and diameter 1.7 nm. A subtle decrease in thermal conductivity steeper than 1/T is observed at the upper end of the temperature range, which is attributed to second-order three-phonon scattering between two acoustic modes and one optical mode. We discuss sources of uncertainty and propose a simple analytical model for the SWNT thermal conductivity including length and temperature dependence.