Gamma induced changes in the structure and optical properties of ZnS/PVA nanocomposite

Abstract

Nanocomposite of polyvinyl alcohol (PVA) and zinc sulfide (ZnS) was fabricated by ex situ casting technique. ZnS nanoparticles were prepared by chemical coprecipitation method in air atmosphere using EDTA-ethylenediamine as stabilizing agent. Rietveld refinement of X-ray data showed that the prepared ZnS adapts cubic zinc blend structure with a lattice parameter fits 5.345 Å and a mean grain size of 4 nm. Samples from ZnS/PVA nanocomposite have been exposed to gamma doses in the range 0-400 kGy. The effect of gamma radiation on the structural and optical properties of ZnS/PVA has been investigated using XRD and UV-Vis spectroscopy. The absorption spectra confirm the formation of hybridized film ZnS/PVA nanocomposite with refractive index in the range of 1.3123-1.5253 (at 700 nm). Also, the gamma radiation reduces the optical energy gap from 4.58 to 2.75 eV. This could be attributed to the increase in structural disorder of the irradiated ZnS/PVA nanocomposite due to the formation of coordination reaction between OH of PVA and ZnS nanoparticles. This means that the gamma radiation led to a more compact structure of ZnS/PVA nanocomposite and causes proper dispersion of ZnS nanoparticles in the PVA matrix. Further, the Commission Internationale de E'Claire (CIE units x, y, and z) methodology was applied for the description of colored samples. The color intensity ΔE, the color difference between the non irradiated sample and the irradiated ones, was increased from 1.39 to 11.18 with increasing the gamma dose up to 400 kGy.

Gamma irradiation‐induced modifications in the structural, thermal, and optical properties of polyvinyl alcohol‐polyethylene glycol/cobalt oxide nanocomposite films

“…Δ W values were calculated applying Scherrer equation [ 20 ] : Δ W is the peak's halo's width at half maximum intensity. λ is X‐ray wavelength.…”

“…[ 4 ] Also, we studied the γ radiation effect on the properties of ZnS/PVA NCP. [ 20 ] The realized main phase of zinc sulfide had 4 nm common size that affects the characteristics of the NCP. In addition, the amorphous nature of the PANI‐Ag/PVA NCP was deeply enhanced owing to the γ induced interaction between the hydroxyl group of the host PVA and the NPs.…”

Tailoring the optical properties of PC/ZnS nanocomposite by γ radiation

“…It is found that the flow behavior of the composite would increase due to the presence of ZnS, primarily associated to appreciable reduction in molecular weights of the PC [40]. In a prior work, the optical and structural properties of g irradiated ZnS/PVA NCP were investigated [41]. It is been found that the g radiation creates more compacted construction of ZnS/PVA NCP and produced good dispersion of ZnS NPs in PVA matrix.…”

Pani‐Ag/PVA nanocomposite: Gamma induced changes in the thermal and optical characteristics

“…[12][13][14][15] Previously, γ radiation effects on the structural and optical properties of the developed ZnS/PVA NCP films were studied by the present authors. [16] The achieved ZnS mother phase possessed average size of 4 nm affecting, therefore, the NCP structural and optical properties. Further, the ZnS@PVA optical performance confirmed apparent well matching between the ZnS and PVA matrix.…”