Structural, Optical and Electrical conductivity Studies of Mn2+ Ions Doped PVAMAAEA Polymer Blend Films

Abstract

Pure and different concentrations of Mn 2+ (1.0, 2.0, 3.0, 4.0 and 5.0 mol%) doped PVA/MAA:EA polymer blend films were prepared by solution casting method. The structural analysis of the prepared samples by X-ray Diffraction reveals broadening of diffraction peak which implies a lower degree of crystallinity with higher Mn 2+ concentration. UV-Vis spectral analysis shows a significant red shift in the optical band gap with increase in Mn 2+ concentration. FTIR spectrum exhibits bands characteristic of stretching and bending vibrations O-H, C-H, C=C and C-O groups and the changes in the FTIR spectrum with dopant concentration indicate the complexation of dopant with the polymer blend. The conductivity study shows that the doping of Mn 2+ ions into the polymer blend system enhances its ionic conductivity from 2.46 X 10 -8 Scm -1 for pure film to 1.41 X 10 -7 Scm -1 for 5 mol% of Mn 2+ ions at room temperature, which is due to the increase in mobile charge carriers and their increased mobility which is explained in terms of an increase in the amorphicity.

Synthesis and Characterization of Polyvinyl alcoholSilver Nanocomposite films and Effect of Gamma Radiation

“…It observed that pure PVA has a smooth network structure. Ag nanoparticles were homogeneously distributed within the PVA matrix film and nanoparticles displayed nearly spherical shapes [19][20]. The presence of Ag was confirmed by the elemental analysis Energy Dispersive X-ray Spectroscopy (EDX), presented in Figure .11.…”

“…Figure . 9, represents the effect of gamma irradiation, the intensity of bands has been observed to decrease further along with the disappearance of bands in the wave number of 2852 and 1654 cm -1 , with increasing gamma dose. This indicates that gamma irradiation subsequently causes the structural rearrangements in PVA chains on the embedding of Ag nanoparticles [17][18].…”

Synthesis, characterization, and tailoring variations in the linear optical of erbium‐ions doped (PVA/PVP) polymeric composites for optical devices: Improvement of the dielectric characteristics

“…For (PVA‐PVP)/Er 3+ films, the relationship between the absorption coefficient and photon energy hv was displayed in Figure 5a,b. As the Er 3+ wt% rose, it was observed that the absorption edge values for the (PVA‐PVP)/Er 3+ films decreased noticeably, suggesting the creation of certain localized states in the bandgap and the growth of compositional disorder 49–51 . The Urbach rule may explain the exponential dependency of the absorption coefficient at the band edge on photon energy 52,53 …”