Thermal conductivity (κ) of isolated carbon nanotubes (CNTs) is higher than the κ of diamond; however, in this Letter we show that the κ of a packed bed of three-dimensional random networks of single and multiwall CNTs is smaller than that of thermally insulating amorphous polymers. The thermoelectric power (Σ) of the random network of CNTs was also measured. The Σ of a single wall nanotube network is very similar to that of isolated nanotubes and, in contrast with κ, Σ shows a strong dependence on the tube diameter.
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Prasher et al. (2009) studied this question.
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