Synthesizing and exploring the structural and optical properties of PVA/PVP/PEG polymeric sheet upon doping with nano nickel oxide (NiO) for CUT-OFF filters

Abstract

Developing novel composite polymeric materials with noteworthy characteristics is vital for crucial research and optical applications in numerous sectors. Using the solution casting method, the blend of the hydrophilic (polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), and polyethylene glycol (PEG)), polymeric composites was evaluated as host carriers for important metal oxide particles of NiO at different concentrations (0.05,0.27,0.55,2.7,5.5,11.04 wt%). The semi-crystalline structural behavior of the produced polymeric sheets was determined by X-ray diffraction (XRD), the surface morphology and the mean grain size of the NiO nanoparticles were investigated through the scanning electron microscopy (SEM), as well as the presence of the O–H group on the PVA/PVP/PEG polymers was identified by the remarkable Fourier transform-infrared (FT-IR) analysis. Using a UV–Vis spectrophotometer, the remarkable impacts of various NiO dopant ratios on the optical properties, transmittance, absorbance, absorption coefficient, and extinction coefficient, of the considered NiO: PVA/PVP/PEG composite sheets were examined. Pure PVA/PVP/PEG polymeric composites have transmittance spectra that are 91 % in the visible range, then drop to 0 % as raising the concentrations of NiO NPs. Additionally, the π-π transition of blend segments is revealed by the studied NiO-doped PVA/PVP/PEGsheets' absorption spectra, which peak at 350 nm. The direct/indirect bandgaps for the pure polymer are (5.40 and 4.98 eV), and they are reduced to (4.81 and 2.84 eV) with the weight of NiO increased, respectively. Based on the optical energy bandgaps (Eg) of the NiO: PVA/PVP/PEG thin composite sheets, seven different models were used to precisely quantify the nonlinear optical characteristics and linear refractive index (n). With the highest concentrations of NiO, the high-frequency dielectric values increased, and the static dielectric constant decreased. The prepared nanocomposites reduced the intensity of three different types of lasers at a wavelength (635 nm, 532 nm, and 450 nm) and the intensity of optical lampe at power 1036 W/m2. The outstanding findings strongly suggest that the proposed NiO: PVA/PVP/PEG thin composite sheets be designed for various optoelectronic, optical filters, and laser medical applications.