Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levels

The influence of the dispersion of vapor grown carbon nanofibers (VGCNF) on the electrical properties of VGCNF/epoxy composites has been studied. A homogeneous dispersion of the VGCNF does not imply better electrical properties. The presence of well distributed clusters appears to be a key factor fo...

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Bibliographic Details
Main Author: Cardoso, P. (author)
Other Authors: Silva, J. (author), Agostinho Moreira, J. (author), Klosterman, D. (author), van Hattum, F.W.J. (author), Simões, Ricardo (author), Lanceros-Mendez, S. (author)
Format: article
Language:eng
Published: 2013
Subjects:
Composite materials
Polymer-based composites
Percolation
Low temperature measurements
Online Access:http://hdl.handle.net/11110/303
Country:Portugal
Oai:oai:ciencipca.ipca.pt:11110/303
Description
Summary:The influence of the dispersion of vapor grown carbon nanofibers (VGCNF) on the electrical properties of VGCNF/epoxy composites has been studied. A homogeneous dispersion of the VGCNF does not imply better electrical properties. The presence of well distributed clusters appears to be a key factor for increasing composite conductivity. It is also shown that the main conduction mechanism has an ionic nature for concentrations below the percolation threshold, while above the percolation threshold it is dominated by hopping between the fillers. Finally, using the granular system theory it is possible to explain the origin of conduction at low temperatures.

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