Microwave Hall mobility studies on polymer-single walled carbon nanotube composite fibers

Abstract

Composite fibers of single walled carbon nanotubes dispersed in poly(methyl methacrylate) and polystyrene are prepared using electrospinning. The single fiber electrical conductivity is measured as a function of the composition of carbon nanotubes. A noncontact method of measuring the carrier mobility at microwave frequency (14GHz) using bimodal cavity is employed. The mobility measurements indicate lower percolation threshold for mobility compared to electrical conduction. For higher concentrations of carbon nanotubes, the mobility is found to decrease indicating possible carrier-lattice scattering.

Percolation Effects in Electrolytically Gated WS2/Graphene Nano:Nano Composites

“…While a number of papers have studied how the resultant composite conductivity scales with the loading level of the conductor, and analyzed the results using the percolation theory, to the author’s knowledge, no papers have gone beyond this. It is therefore not known how basic quantities such as mobility and carrier density scale with volume fraction in such composites (in fact, very few papers have measured these properties, even in the more well-known polymer-based nanocomposites , ).…”