Essential tips for enhancing the opto-electrical performance of CdSe (NPs)/Epoxy resin

The current paper presents the advantages of the addition of CdSe nanoparticles (NPs) with different ratio (0, 0.25, 0.5, 0.75, 1.0, 1.25 and 1.5%) on opto-electrical properties of Epoxy resin [ER]. The organometallic method was used for preparing CdSe (NPs) in epoxy matrix solution. The morphology of the obtained nanocomposites (NCs) was characterized in terms of X-Ray diffraction, scanning electron microscope (SEM), Energy -dispersive X-ray spectroscopy (EDX), optical and dielectric properties. The UV–Visible absorption spectra for (NCs) were collected in the wavelength range (250–700 nm) and were analyzed. The absorption coefficient ( α ), optical energy gap (E_g), and refractive index (n) showed a clear dependence on the CdSe NPs concentration. Increasing the ratio of CdSe NPs led to the increase of the values of the absorption coefficient ( α ). Moreover, the results also demonstrate that the value of the direct optical band energy for [ER] was decreased from 3.40 eV to 2.69 eV with increasing the CdSe (NPs) concentration from 0.25% to 1.50% in the [ER]. It was also observed that the optical energy gap (E_g) is correlated with the optical electronegativity (Δχ_opt) and is affected by the increase of CdSe NPs ratio as well. The refractive index (n), the dielectric constant ( ε ) and optical dielectric constants ( ε o p t ) increased with the increase in CdSe NPs content. Furthermore, the optical conductivity ( σ o p t ) , increases with the increase CdSe NPs content. Finally, the variation of the electronic polarizability ( α e ), the dielectric susceptibility (χ_e), transmission coefficient (T) and reflection loss (R_L) with the increase of CdSe NPs ratio in [ER] were analyzed. In this work we highlight the significance of the interrelations between the above defined parameters, which were successfully predicting their effect on the performance of [ER] upon the addition of CdSe NPs.