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The (PS-In 2 O 3 / ZnCoFe 2 O 4 ) nanocomposites have been prepared by using solution casting method. The structural, optical and dielectric properties of (PS-In 2 O 3 / ZnCoFe 2 O 4 ) nanocomposites have been studied to use it for different optoelectronics applications. The structural properties include FTIR, optical microscope and SEM. The results of optical properties for (PS-In 2 O 3 / ZnCoFe 2 O 4 ) nanocomposites showed that the absorbance, absorption coefficient, refractive index, extinction coefficient, dielectric constants and optical conductivity of (PS-In 2 O 3 ) nanocomposites were increased with the increase in ZnCoFe 2 O 4 nanoparticles concentrations while the transmittance and energy band gap were decreased with the increase of the ZnCoFe 2 O 4 nanoparticles concentrations. The(PS-In 2 O 3 / ZnCoFe 2 O 4 ) nanocomposites have high absorbance in the UV-region. The results of dielectric properties showed that the dielectric constant, dielectric loss and A.C electrical conductivity of (PS-In 2 O 3 ) nanocomposites increase with increase in ZnCoFe 2 O 4 nanoparticles concentrations. The dielectric constant and dielectric loss decrease while the electrical conductivity increases with an increase in frequency.

The dielectric characteristics of PVA/PEG/In2O3 nanostructures were tested to use in various electric nanodevices. The films of nanostructures of PVA/PEG/In2O3 were synthesized by casting solution technique. The dielectric characters of PVA/PEG/In2O3 nanostructures were determined. Results expressed that the dielectric parameters of PVA/PEG were rise with rise in the In2O3 NPs ratio. The performance of ε', ε" and σAC with frequency illustrated that the ε' and ε" reduced whereas the σAC rises with rise in frequency. The final results demonstrated the PVA/PEG/In2O3 nanostructures may be suitable in various electrical nanodevices.