Magnetodielectric effects in three reduced graphene oxide–polymer nanocomposites

Three polymers, poly(vinyl alcohol) (PVA), poly(acrylic acid) (PAA) and poly(methyl methacrylate) (PMMA), are used as matrices to synthesize three nanocomposites each with reduced graphene oxide (RGO) fillers (5 wt%). The dielectric properties of these nanocomposites, RGO–PVA, RGO–PAA and RGO–PMMA, are studied in zero magnetic field and in magnetic field ( H ) up to 1.2 T. From these data magnetodielectric effects are obtained as the variation of 𝝴 and 𝝴0 —the real and imaginary parts of complex dielectric constant with H at some frequencies. Thus at 100 kHz for the increase of H from zero to 1 T 𝝴 decreases by 5% in RGO–PVA and by 4% in RGO–PAA, whereas increases by 4% in RGO–PMMA. The observed magnetodielectric effects, though small, are significant. They show both decrease and increase of 𝝴 depending on the polymer. This fact is the indicative of the interaction between RGO filler particles and polymer chains. (author)