Open AccessDC and AC Conductivity of Carbon Nanotubes−Polyepoxy Composites
Author(s) -
Sophie Barrau,
Philippe Demont,
Alain Peigney,
Christophe Laurent,
C. Lacabanne
Publication year - 2003
Publication title -
macromolecules
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.994
H-Index - 313
eISSN - 1520-5835
pISSN - 0024-9297
DOI - 10.1021/ma021263b
Subject(s) - carbon nanotube , conductivity , power law , materials science , composite material , thermal conduction , exponent , percolation threshold , percolation (cognitive psychology) , scaling , atmospheric temperature range , scaling law , dc bias , electrical resistivity and conductivity , condensed matter physics , chemistry , thermodynamics , voltage , physics , mathematics , quantum mechanics , linguistics , statistics , philosophy , geometry , neuroscience , biology
International audienceThe dc and ac conductivities of carbon nanotubes−polyepoxy composites have been investigated from 20 to 110 °C in the frequency range 10-2−106 Hz as a function of the conductive weight fraction p ranging from 0.04 to 2.5 wt %. The frequency dependence of the measured conductivity obeys the universal dynamic response (UDR): a dc plateau followed, above a critical frequency ωc, by the ωs power law with exponent s 0.6−1. The dc conductivity follows a percolation scaling law: σdc (p − pc)t with pc = 0.3 wt % and t = 1.4−1.8, according to the temperature. σdc reached 10-4 S/cm for 2.5 wt % CNTs content and increases with increasing temperature. Considering a biased random walk in three dimensions approach, we may explain the scaling law of ωc with p and its proportionality to σdc. The universality of ac conduction in carbon nanotubes−polymer composites is examined by the construction of master curves
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