Thermal Conductivity of Single Wall Carbon Nanotubes: Diameter and Annealing Dependence
The thermal conductivity, k(T), of bulk single-wall carbon nanotubes (SWNT's) displays a linear temperature dependence at low T that has been attributed to 1D quantization of phonons. To explore this issue further, we have measured the k(T) of samples with varying average tube diameters. We observe linear k(T) up to higher temperatures in samples with smaller diameters, in agreement with a quantization picture. In addition, we have examined the effect of annealing on k(T). We observe an enhancement in k(T) for annealed samples which we attribute to healing of defects and removal of impurities. These measurements demonstrate how the thermal properties of an SWNT material can be controlled by manipulating its intrinsic nanoscale properties.
Additional Information© 2001 American Institute of Physics. Issue Date: 7 November 2001. This research is supported by the US Department of Energy DOE DEFG02-98ER45701 (MCL and JEF) and by the National Science Foundation (NSF Grant No. DMR 98-02560) (JH and ATI).
Published - LLAaipcp01.pdf