Abstract
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.
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Thanks for the support provided by the Beijing Natural Science Foundation (No. 3192022), and National Natural Science Foundation of China (No. 51876007 and No. 52176054).
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Li, P., Feng, D., Feng, Y. et al. Measuring Thermal Conductivity of an Individual Carbon Nanotube Using Raman Spectroscopy. J. Therm. Sci. 31, 1016–1022 (2022). https://doi.org/10.1007/s11630-022-1625-6
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DOI: https://doi.org/10.1007/s11630-022-1625-6