فهرست نشریات علمی دسترسی آزاد ایران

This study covers how to solution cast polyvinyl alcohol (PVA)/ polyaniline (PANI) composites reinforced with 0, 2, 4, 6 and 8 wt.% copper oxide (Cu2O). The samples underwent characterization using OM (Optical Microscopy), FESEM (Field Emission Scanning Electron Microscopy), FTIR (Fourier Transform Infrared Spectroscopy), and UV-Vis (Ultraviolet-Visible) analytical procedures.  The OM pictures revealed the formation of network routes inside the polymeric matrix as charge carriers, which increased with higher concentrations of nanoparticles. The nanocomposite surface was analyzed using a field emission scanning electron microscope (FESEM). FESEM revealed the consistent dispersion of Cu2O nanoparticles in (PVA/PANI) matrix polymers. The application of Fourier transformation spectroscopy (FTIR) allowed for the detection and analysis of molecular vibrations inside the structure of the nanocomposite. The FTIR measurement demonstrated polymer matrix- Cu2O nanoparticle interaction. The Cu2O nanoparticles and PVA/PANI polymers matrix exhibit physical interaction as observed in FTIR investigations. A thorough analysis was conducted on the optical characteristics. Elevating the concentration of Cu2O nanoparticles in PVA/PANI sheets resulted in higher absorbance and lower transmittance. The integration of (Cu2O) nanoparticles at a concentration of 8 wt.% in the (PVA/PANI/ Cu2O) nanocomposite resulted in a decrease in the energy gap. More precisely, the energy gap reduced from 4.6 electron volts (eV) to 3.2 eV for the permissible indirect transition, and from 4.47 eV to 2.9 eV for the impermissible indirect transition. The weight percentages of Cu2O nanoparticles have a positive correlation with their absorption coefficient, extinction coefficient, refractive index, real and imaginary parts of dielectric constants, and optical conductivity.   The results support the excellent optical capabilities of PVA/PANI/ Cu2O film nanocomposites, thereby promoting their use in photodetector applications.