Optoelectrical properties of polymer composite

Abstract

The physical properties of polystyrene composites containing different concentrations of iron (0, 5, 10, 20 and 30 wt.%) were studied as a function of ultraviolet (UV) wavelength, iron concentration, temperature, and applied field frequency. The absorption spectra were collected using the UV-spectrophotometry, and the electrical results were determined using the alternating current (AC) impedance method. Analysis of the optical absorption spectra results showed that the transition of energy electrons is direct in k-space and the optical energy gap decreases with iron content. The impedance was measured in the frequency range 50 kHz-1 MHz and temperature range 30-110 C. It was found that the dielectric constant and the dielectric loss of the composites increase with iron concentration and decrease with the applied frequency. The AC conductivity of the composites increases with frequency, temperature, and iron concentration. The low value of the activation energies indicates that the composite of 30 wt.% of iron nearly becomes a conductive material.

Optical and electrical properties of polystyrene composites containing ultrafine iron particles

“…Psarras et al 12 investigated the dependence of the alternating current (AC) conductivity and dielectric constant of iron particles dispersed in epoxy and found that conductivity increases with increasing temperature, but at low frequencies the AC conductivity tends to be constant. Zihlif et al 13 reported the effect of iron concentrations of medium particle size (230 mm) on the AC electrical and optical properties of iron/PS composites. They reported that frequency, temperature, and iron concentration strongly affect the properties of composites.…”

Impact of Mn–Ni spinal ferrite nanoparticles on the structural, morphological, surface roughness, and optical parameters of polyvinyl alcohol for optoelectronic applications

“…This result can be supported by investigating the band tail width of these states, also called the Urbach energy ( E U ). The E U value is determined using the following relation, 2 where α 0 is a constant. The relation was drawn between ln ( α ) against ( hυ ), as shown in Fig.…”

Effect of particles size on the optical constants of iron/polystyrene composites via UV-radiation

“…A case that encourages us to conduct a study on the optical properties of iron/PS composites. Recently, we have reported the effect of iron concentrations on the AC-electrical and optical properties of iron/PS composites (13). The present study deals mainly with the effect of iron particles size on the optical constants such as energy gap, refractive index, and dielectric properties using the concept of interaction of the incident UV-radiation with composites prepared containing different iron particle sizes.…”