EMI and Microwave absorbing efficiency of polyaniline functionalized reduced graphene oxide@γ-Fe2O3@Epoxy Nanocomposite
Polyaniline decorated reduced graphene oxide/ferrite nanofiller (RGPF) prepared by solution mixing method in three different ratios 1:3, 1:1 and 3:1 of polyaniline decorated reduced graphene oxide and Ferrite have been studied for microwave absorption properties in defence application. The Polyaniline decorated reduced graphene oxide/ferrite and neat ferrite nano-fillers have been used for the preparation of epoxy nanocomposite (RGPFE) of 60 wt %. The distribution of RGPF nanofiller in the epoxy matrix was analyzed by field emission scanning electron microscopy. Further thermal gravimetric analyses reveal the excellent thermal stability of nanocomposites. Vibrating sample magnetometer was employed to find out the magnetic behavior of prepared nanocomposites. The complex permittivity and permeability have been investigated to evaluate principal properties in the frequency range varied from 2 to 18 GHz. These results show that the epoxy nanocomposite with 60 wt % RGPF filler in the ratio of 3:1 has maximum dielectric loss. Finally, these electromagnetic data are used to calculate the reflection loss of the Epoxy nanocomposites and show good agreement between the calculated and measured data of these nanocomposites. The minimum reflection loss was observed as -10.26 dB in X band with a thickness of 3.0 mm and the bandwidth was 8.47 GHz for RL≤−10 dB. On the basis of above observations, these nanocomposites could be a good candidate for electromagnetic interference shielding (EMI) and microwave absorption application.