کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
819893 | 1469497 | 2016 | 9 صفحه PDF | دانلود رایگان |
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.
Journal: Composites Science and Technology - Volume 128, 18 May 2016, Pages 75–83