The influence of matrix mediated hopping conductivity, filler concentration, aspect ratio and orientation on the electrical response of carbon nanotube/polymer nanocomposites

Abstract

To cite this version:J. Silva, S. Ribeiro, S. Lanceros-Mendez, R. Simões. The influence of matrix mediated hopping conductivity, filler concentration, aspect ratio and orientation on the electrical response of carbon nanotube/polymer nanocomposites. Composites Science and Technology, Elsevier, 2011, 71 (5) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractA model to simulate the conductivity of carbon nanotube/polymer nanocomposites is presented. The proposed model is based on hopping between the fillers. A parameter related to the influence of the matrix in the overall composite conductivity is defined. It is demonstrated that increasing the aspect ratio of the fillers will increase the conductivity.Finally, it is demonstrated that the alignment of the filler rods parallel to the measurement direction results in higher conductivity values, in agreement with results from recent experimental work.

Electro-mechanical properties of triblock copolymer styrene–butadiene–styrene/carbon nanotube composites for large deformation sensor applications

“…In the present case of elastomeric materials, the GF is also large around the percolation threshold, but due to the small filler content at the threshold, just small deformations (below 5%) can be applied before a strong decrease of the electrical conductivity occurred due to the strong decrease of the local concentration of the filler, which destroy the conductive path between fillers [19,20].…”

The effect of nanotube surface oxidation on the electrical properties of multiwall carbon nanotube/poly(vinylidene fluoride) composites

“…On the other hand, several models have been proposed for the origin of a non-universal conductivity critical exponent, [14]. Using hopping between the fillers as conduction model [15], it results in a conduction critical exponent that is equal to that predicted by the effective medium theory [16].…”

Mechanical, electrical and electro-mechanical properties of thermoplastic elastomer styrene–butadiene–styrene/multiwall carbon nanotubes composites

“…For high aspect ratio fillers the percolative network can be formed with lower concentrations producing a composite with higher electrical and mechanical properties. The percolation threshold found for this type of nanocomposites depends on the properties of the materials (matrix and nanoparticles) [19][20], nanofiller dispersion agent and method [1,21] and can be reduced down to 0.1 % vol using CNT [1]. The typical percolation threshold is between 10-25 % vol for CB [1] and 1.0-5 % vol to CNF [4].…”