Dielectric properties of composites of multi-walled carbon nanotubes in a resin matrix

Aïssa Allaoui (1) , Jinbo Bai (1) , Nadine Rieux (2)

1 MSSMat - Laboratoire de mécanique des sols, structures et matériaux
2 PERT - PERT

The dielectric properties of a MWNT/epoxy composite have been studied by impedance spectroscopy. The results were very attractive and showed that the addition of a small amount of MWNTs allows increasing the permittivity of the resin by many orders of magnitude. The insulator-to-conductor transition, which occurred when a few wt% of MWNTs was added to the matrix, is related to a percolation phenomenon with nonuniversal critical exponent. Two types of MWNTs treatment have been compared and the results demonstrate that MWNTs should be used in as-prepared state. The treatment alters their morphology, the aspect ratio can be reduced by a factor of 10, leading to a modification of the shape of the insulator-to-conductor transition curve and a decrease of the global improvement.

Mots clés: Carbon nanotubes; dielectric properties; polymer composites; permittivity.; permittivity

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Micro et nanotechnologies/Microélectronique; Matériaux

Aïssa Allaoui, Jinbo Bai, Nadine Rieux. Dielectric properties of composites of multi-walled carbon nanotubes in a resin matrix. Polymers and Polymer Composites, 2003, 11, pp.171-178. ⟨hal-00411073⟩