Abstract:
The nickel ferrite nano particles were synthesized using co-precipitation method. The composite of nickel ferrite with graphene platelets (0.0%, 5%, 10%, 15%, and 20%) was synthesized by dispersion method. Water was used as a solvent for uniform and homogenous dispersion of nickel ferrite nano particles and graphene platelets. The synthesized sample was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and fourier transform infrared spectroscopy (FTIR). Impedance analyzer and LCR meter was used for performing dielectric measurements and microwave analysis. The formation of single phase face centered cubic NiFe2O4/graphene nano composite was confirmed using (XRD). Debye Scherer equation was used to find out the crystallite size that was in range of 26 ±5nm. The attachment of ferrite particles on graphene platelets were observed through (SEM). The band positions were studied using (FTIR). The study of dielectric properties with change in frequency was done at room temperature. The dielectric properties of NiFe2O4/graphene platelets showed a huge enhancement leading towards super capacitor behavior of prepared nano composite. For the pure nickel ferrite the real part of dielectric constant was 1.17x104 and it enhanced to 3.82x1015 at 100 Hz for 20% graphene loading. The values of dielectric loss has increased from 5.15x103 to 2.96x1019 at 100 Hz and also the values of tangent loss showed increase from 0.80 to 7.31x105 at 100 Hz. AC conductivity values also showed increase from 1.70x10-4 to 5.30x1011 at 100 Hz. AC conductivity results explain that electron hopping governs the conduction process. The decrease in AC impedance is observed with increase in graphene platelet content. The enhanced dielectric properties of the prepared nano composite make it applicable in field of super capacitors. The reflection loss decreases with increase in graphene platelet concentration due to high electrical conductivity of graphene platelets.
