Conductivity scaling with bundle length and diameter in single walled carbon nanotube networks

Transparent single walled carbon nanotube (SWNT) networks were printed on plastic substrates. Nanotubes in the network form small bundles, and the authors evaluated the dc conductivity (sigma(dc)) as a function of the average bundle length (L-av) in the network. They find sigma(dc) to vary as sigma(dc)similar to L-av(1.46) for bundles of the same diameter and give a qualitative argument for why this agrees with a model where the resistance between SWNT bundles dominates the overall network resistance. (c) 2006 American Institute of Physics.