Thermal Conductivity of Single Wall Carbon Nanotubes: Diameter and Annealing Dependence

Details Thermal Conductivity of Single Wall Carbon Nanotubes: Diameter and Annealing Dependence Thermal Conductivity of Single Wall Carbon Nanotubes: Diameter and Annealing Dependence

2001-08-08

arxiv.org/abs/cond-mat/0108142v2

Physics

Condensed Matter

Materials Science

Proc. of the XV. Int. Winterschool on Electronic Properties of Novel Materials, Kirchberg/Tirol, Austria, 2001

Scientific paper

10.1063/1.1426893

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.

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