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Abstract
Results of broadband dielectric spectroscopy of epoxy resin composites containing graphene nanoplatelets (GNP) are presented in a wide temperature range (25-500 K). The as-produced composites were heated at temperatures above the epoxy glass transition and subsequently cooled down to room temperature. This annealing was proved to be a simple but powerful process to improve significantly the electromagnetic properties of the GNP-based composites. The dc conductivity of epoxy filled with 4 wt% GNP is 68 times higher after annealing. Another benefit of the annealing is to lower substantially the percolation threshold, from 2.3 wt% for as-produced samples to 1.4 wt%. In composites above the percolation threshold, the electrical conductivity is the result of tunneling between GNP clusters. For a given GNP concentration, the tunnel barrier decreases after annealing.
Original language | English |
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Pages (from-to) | 75-83 |
Number of pages | 9 |
Journal | Composites Science and Technology |
Volume | 128 |
DOIs | |
Publication status | Published - 22 Mar 2016 |
Keywords
- Annealing
- Electrical properties
- Nano particles
- Polymer-matrix composites (PMCs)
- Thermal properties
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Dive into the research topics of 'Electromagnetic properties of graphene nanoplatelets/epoxy composites'. Together they form a unique fingerprint.Projects
- 1 Finished
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FAEMCAR: Fundamental and Applied Electromagnetics of Nano-Carbons, FP7 Marie Curie IRSES 318617
Lambin, P. (PI)
1/11/12 → 31/10/16
Project: Research