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

Abstract

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 (Eg), 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 (Eg) is correlated with the optical electronegativity (Δχopt) and is affected by the increase of CdSe NPs ratio as well. The refractive index (n), the dielectric constant (ε) and optical dielectric constants (εopt) increased with the increase in CdSe NPs content. Furthermore, the optical conductivity (σopt), increases with the increase CdSe NPs content. Finally, the variation of the electronic polarizability (αe), the dielectric susceptibility (χe), transmission coefficient (T) and reflection loss (RL) 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.