Electron conduction in fe‐doped polystyrene films

Abstract

The DC electrical conductivity of pure and Fe3 +-doped polystyrene films has been studied at various bias field strengths in the temperature range 304-392K. Doped films showed increased conductivity compared with undoped films up to 0.5% dopant concentration; beyond this concentration there was a decrease in the conductivity. The increase in conductivity for lower doping concentrations (0.25% and 0.5%) is attributed to the formation of charge transfer complexes. The decrease in the electrical conductivity and the increase in the activation energy at more than 0.5% dopant concentration is due to the formation of molecular aggregates. For undoped films the activation energies in the low temperature region were found to be higher than those at higher temperatures. Also, with increasing bias field strength, the activation energies showed a decrease at all temperatures studied. It is suggested, on the, basis of the magnitudes of the activation energies, that electronic conduction is the dominant charge transport mechanism both at low and high temperatures.

Structural, electrical and magnetic properties of polystyrene films filled with AgNO3–FeCl3 mixed fillers

“…Among such materials PS which is a preferred material because it has good stiffness, optical, electrical and mechanical properties [1,2]. In addition PS is a non-polar, low loss polymer and hence has desirable electronic properties for use in the field of insulating materials [3,4]. PS and its blends have been widely used for producing materials with improved physical and mechanical properties [5][6][7].…”

“…Ferric chloride, FeCl 3 , with trivalent iron ions of 3d 5 electron configuration was selected as a filler due to its magnificent magnetic and electrical properties [3,4,[8][9][10]16]. Moreover, FeCl 3 has been reported to give the most stable material, an aspect of importance when considering applications [16].…”

“…Recently transition metal ions have been extensively used as fillers in organic polymers because of the partially filled d-electron shells of very interesting properties [3,4,[7][8][9][10][11][12][13][14][15][16]. Ferric chloride, FeCl 3 , with trivalent iron ions of 3d 5 electron configuration was selected as a filler due to its magnificent magnetic and electrical properties [3,4,[8][9][10]16].…”

Polymer Thermoplastic Proton Conductors Based on PPO and PS Ionomer Blends

“…At present, due to the general interest in obtaining high proton conducting polymer membranes1–3 for applications in fuel cells,4–7 thermal stable thermoplastic polymers, such as PPO and PS, are especially attractive. Both are engineering and high‐performance materials that possess stable phenyl rings capable to undergo a reaction of sulfonation, through which they incorporate SO 3 H groups into their structure.…”

Effect of AgNO3–MnCl2 mixed fillers on the physical properties of polystyrene films

“…Doped organic polymers display interesting phenomena similar to those of conventional semiconductors. Despite the huge amount of research on doped polymers, substantial work concerning polymers doped with rare‐earth and transition‐metal ions has only recently been published 6–16…”