Experimental observation of scaling laws for alternating current and direct current conductivity in polymer-carbon nanotube composite thin films
By B. Kilbride, Jonathan N. Coleman, J. Fraysse, P. Fournet, M. Čadek, A. Drury, S. Hutzler, S. Roth, W. Blau. 2002
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Alternating current (ac) and direct current (dc) conductivities have been measured in polymer-nanotube composite thin films. This was carried out for a range of concentrations of multiwall nanotubes in two polymer hosts, poly(m-phenylenevinylene-co-2,5-dioctyloxyp-phenylenevinylene) (PmPV) and polyvinylalcohol (PVA). In all cases the dc conductivity σDC was ohmic in the voltage range studied. In general the ac conductivity displayed two distinct regions, a frequency independent region of magnitude σ0 at low frequency and a frequency dependent region at higher frequency. Both σDC and σ0 followed a percolation scaling law of the form σ∝(p−pc)t with pc=0.055% by mass and t=1.36. This extrapolates to a conductivity of 1×10−3 S/m for 100% nanotube content. Such a low value reflects the presence of a thick polymer coating, resulting in poor electrical connection between tubes. This leads to the suggestion that charge transport is controlled by fluctuation induced tunneling. In the high frequency regime the cond...
Subfields: Electrical and Electronic Engineering, Materials Chemistry, Polymers and Plastics
View Paper: https://www.semanticscholar.org/paper/f36bb2cdfd0f0cf3a546dd11b614a219701e2bef
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Citations in the corpus
- A review and analysis of electrical percolation in carbon nanotube polymer composites (2009, methodology): “[95] Kilbride BE, Coleman JN, Fraysse J, Fournet P, Cadek M, Drury A, Hutzler S, Roth S, Blau WJ.”
- Electric field-induced aligned multi-wall carbon nanotube networks in epoxy composites (2005, background): “The maximum conductivity of such nanocomposites is generally limited due to the presence of polymer barriers between individual nanotubes and/or nanotube clusters [24,25] and is a few orders of magnitude lower than the conductivity of pure nanotube mats [26].”
- Two percolation thresholds in carbon nanotube epoxy composites (2007, background): “However, for rodlike particles lower [18] as well as higher [14,19] values can be found in literature.”
- Fundamentals, processes and applications of high-permittivity polymer–matrix composites (2012, background): “It is often considered as a consequence of interfacial polarization and an effective increase of electrode surface area due to interconnection of conductive particle clusters near the percolation threshold [80,84].”