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Cardoso, P.
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Topics
Publications (7/7 displayed)
- 2012On the origin of the electrical response of vapor grown carbon nanofiber + epoxy composites
- 2012Quantitative evaluation of the dispersion achievable using different preparation methods and DC electrical conductivity of vapor grown carbon nanofiber/epoxy compositescitations
- 2012Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levelscitations
- 2012Effect of filler dispersion on the electromechanical response of epoxy/vapor-grown carbon nanofiber compositescitations
- 2012The role of disorder on the AC and DC electrical conductivity of vapour grown carbon nanofibre/epoxy compositescitations
- 2011The influence of the dispersion method on the electrical properties of vapor-grown carbon nanofiber/epoxy compositescitations
- 2010The dominant role of tunneling in the conductivity of carbon nanofiber-epoxy compositescitations
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article
Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levels
Abstract
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.