Graphite nanoplatelets (GNPs)/epoxy nanocomposites have promising potentialsin the electromagnetic application, such as microwave absorption, electromagneticinterference shielding, and supercapacitors, due to their exceptional electricalproperties, high aspect ratio, and large surface area.The nitric-acid surface treatment of GNPs induces functional groups to improvethe interfacial bonding between GNP and epoxy, and also may cause graphite breakand damages on the surface of graphite. Due to these facts, the dispersion of graphitenanoplatelets can be improved, which leads to changing electrical properties ofnanocomposites, such as electrical conductivity and complex permittivity.Therefore, the complex permittivity spectra of nanocomposites reinforced withboth as-received and nitric-acid treated GNPs in epoxy system were measured in thefrequency range of 0.05-18 GHz.
展开▼
