Optical properties of PVA Doped with CGNS Nanosheets

Abstract

The PVA polymers doped with coarse-grained graphene nanosheets (CGNS) with different concentrations (3, 6, and 9 wt.%) were prepared by the pulsed laser ablation technique. The Fourier-transform infrared (FTIR) spectroscopy, optical microscopy, x-ray diffraction (XRD), and UV-visible spectrophotometry were used to study the structural and optical characteristics of the prepared PVA-CGNS nanocomposites. When the concentration of CGNS is increased, the absorbance, index of refraction, and imaginary and real dielectric constants increased while the transmittance and energy band gap decreased. The allowed indirect energy gap decreased from 4.54 to 4.257 eV and the forbidden indirect energy gap decreased from 3.79 to 2.89 eV. The results are encouraging to use this nanocomposite for radiation shielding, spectroscopic devices, and other applications.