本文采用采用非接触式拉曼光谱实验方法测量了单根单壁和多壁碳纳米管的热导率，测量中考虑了激光对碳纳米管的加热作用。通过碳纳米管的拉曼G峰频移随温度呈线性变化的规律获得碳纳米管的局部温度，结合一维导热模型，计算得到其热导率。在316 K-378 K的测量温度范围内，长度为25 μm，直径为1.34 nm的单壁碳纳米管的热导率随着温度的升高而降低，热导率变化范围为1651 W/m·K-2423 W/m·K；316 K-445 K温度范围内，长度为40 μm，直径为9.2 nm的多壁碳纳米管的热导率范围为1109 W/m·K-1700 W/m·K 。 采用分子动力学模拟进一步分析了碳纳米管热导率的尺寸效应， 结果表明单根碳纳米管热导率随管长的增加而增大，最终趋于一收敛值。本文可为单根碳纳米管的热性能研究提供参考数据。

In this paper, a non-contact method based on Raman spectroscopy was used to measure the thermal conductivity of an individual single-walled carbon nanotube (SWCNT) and a multi-walled carbon nanotube (MWCNT). The effect of laser-induced heating on carbon nanotubes (CNTs) was considered. The local temperatures along the longitudinal direction of carbon nanotube were determined by Raman shift, combined with one-dimensional heat conduction model, and the thermal conductivity was finally obtained. The thermal conductivity of the SWCNT with a length of 25 μm and a diameter of 1.34 nm decreases as the temperature increases in the measuring temperature range (316 K–378 K). The corresponding thermal conductivities change from 1651 W/(m·K) to 2423 W/(m·K); the thermal conductivities of the MWCNT with 40 μm length and 9.2 nm diameter are within 1109–1700 W/(m·K) at 316 K–445 K. To further analyze the size effect on the thermal conductivity, molecular dynamics simulation has been carried out. The result shows that the thermal conductivity of an individual carbon nanotube increases with increasing nanotube length and eventually converges. This work is expected to provide some reference data for the studies of thermal properties of individual CNTs.