Enhanced Performance of Graphene-Epoxy Flexible Capacitors by Means of Ceramic Fillers

Graphene–epoxy flexible capacitors are obtained by graphene–polymer transfer and bonding via UV‐cured epoxy adhesive. Ceramic fillers are dispersed into the epoxy resin with the aim of enhancing the capacitive behavior of the final device. Parallel plate capacitors in which epoxy resin is filled with ceramic nanoparticles demonstrate superior performance, up to two orders of magnitude better than unfilled samples. Zirconia, showing the highest dielectric constant, fails to give a stable output in the whole frequency range, as some competing phenomena occur and reduce the overall polarization of the system. Boehmite appears to be a better choice and gives reasonable performances, better than gibbsite Graphene–epoxy flexible capacitors are prepared by graphene–polymer transfer and bonding via UV‐cured epoxy adhesive. Ceramic fillers are dispersed into the epoxy resin with the aim of enhancing the capacitive behavior of the final device. Nanoparticle‐filled parallel plate capacitors are shown to have superior performance, up to two orders of magnitude better than unfilled samples.