Broadband ac conductivity of conductor-polymer composites
TLDR
In this article, the electrical conductivity of a composite model system formed by highly structured carbon black (CB) filled, within an amorphous polymer, poly~ethylene terephtalate! composite is studied.Abstract:
The electrical conductivity of a composite model system formed by highly structured carbon black ~CB! filled, within an amorphous polymer, poly~ethylene terephtalate! composite is studied. The dc conductivity as a function of CB content follows a scaling law of the type s}(p2pc) t yielding for the percolation concentration, pc50.011 and for the exponent, t52.17. The analysis of the temperature dependence of the conductivity suggests that for temperatures larger than 45 K, conduction can be ascribed to thermal fluctuation induced tunneling of the charge carriers through the insulating layer of polymer separating two CB aggregates. At lower temperatures, conductivity becomes temperature independent, which is typical of conventional tunneling. The frequency dependence of the conductivity is also studied between dc and 10 Hz. By the introduction of a shift factor ap , a procedure for the construction of a master curve based on a ‘‘time-length equivalence principle’’ is proposed. Finally, a model is introduced to describe the frequency dependence of the conductivity of CB-filled composites based on the behavior of charge carriers placed in a fractal object. @S0163-1829~98!06304-8#read more
Citations
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A review and analysis of electrical percolation in carbon nanotube polymer composites
TL;DR: In this paper, a comprehensive survey of electrical percolation of carbon nanotubes (CNT) in polymer composites is presented, together with an attempt of systematization.
Journal ArticleDOI
Fractal design concepts for stretchable electronics
Jonathan A. Fan,Woon-Hong Yeo,Woon-Hong Yeo,Yewang Su,Yewang Su,Yoshiaki Hattori,Woosik Lee,Sung Young Jung,Yihui Zhang,Yihui Zhang,Zhuangjian Liu,Huanyu Cheng,Leo Falgout,Mike Bajema,Todd P. Coleman,Daniel J. Gregoire,Ryan J. Larsen,Yonggang Huang,John A. Rogers +18 more
TL;DR: Th thin films of hard electronic materials patterned in deterministic fractal motifs and bonded to elastomers enable unusual mechanics with important implications in stretchable device design, suggesting that fractal-based layouts represent important strategies for hard-soft materials integration.
Journal ArticleDOI
Experimental observation of scaling laws for alternating current and direct current conductivity in polymer-carbon nanotube composite thin films
B. E. Kilbride,Jonathan N. Coleman,J. Fraysse,Patrick Fournet,Martin Cadek,Anna Drury,Stefan Hutzler,S. Roth,Werner J. Blau +8 more
TL;DR: In this article, alternating current and direct current (DC) conductivities have been measured in polymer-nanotube composite thin films for a range of concentrations of multi-wall nanotubes in two polymer hosts.
Journal ArticleDOI
Electrical conductivity of chemically modified multiwalled carbon nanotube/epoxy composites
TL;DR: In this article, the electrical conductivity of oxidized multiwalled carbon nanotubes (MWNT)/epoxy composites is investigated with respect to the chemical treatment of the MWNT.
Journal ArticleDOI
DC and AC Conductivity of Carbon Nanotubes-Polyepoxy Composites
TL;DR: In this paper, 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 0.6−1.8, according to the temperature.
References
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Book
Introduction to percolation theory
Dietrich Stauffer,Amnon Aharony +1 more
TL;DR: In this article, a scaling solution for the Bethe lattice is proposed for cluster numbers and a scaling assumption for cluster number scaling assumptions for cluster radius and fractal dimension is proposed.
Book
Lectures on the electrical properties of materials
Laszlo Solymar,D. Walsh +1 more
TL;DR: The fifth edition of the book as discussed by the authors contains 14 lectures, covering such topics as elementary electron theory, the principles of semiconductors, dielectric and magnetic materials, optoelectronics and super conductivity.