Identification of frequency regimes for short and long range mobility of charge carriers in GO/MnFe2O4/PPy nanocomposites

Abstract

The physico-chemical properties of polymer ceramic composites highly depend upon the nature of ceramic, polymer and their interface. Among other interesting features, they have potential for flexible electronics and energy storage devices. Especially, graphene based polymer ceramic composites are unique for their high dielectric characteristics. In this regard, we synthesized a three constituent novel nanocomposite with polymer matrix to check their potential for energy storage applications. Here in, the polypyrrole has been exquisitely decorated with graphene oxide and manganese ferrite nanoparticles with their different concentrations. The development of spherical grains and their transformation into rod like morphology with a significant change in their dimension is noticed. The weight percentage of all elements according to their stoichiometric formula and the finger prints of different constituents in the form of their functional groups are also identified before their dielectric and ferroelectric analyses. The highest value of dielectric constant (121449) has been noticed at 100 Hz frequency, which reduced to 1066 at 1 MHz. The dielectric loss was also quite high at lower frequency which decreased to 1.2 at same high value of frequency (1 MHz). The calculations for recoverable energy density and energy loss density are performed using PE hysteresis loops and the highest value of recoverable energy density is recorded as 4.7 × 10−8 mJ/cm3. Thus, high values of dielectric constant and low dielectric loss of these nanocomposites make them attractive dielectric material in electrical appliances for capacitive applications.