A free-standing Co: ZnO (CZO) doped PVA nanocomposite polymer system films (CZO-PVA NCPSFs) for optical sensing electronic devices

The casting aqueous solution technique was used to prepare Co: ZnO incorporated PVA nanocomposite polymer system films (CZO-PVA NCPSFs) with different wt % CZO nanopowders. Based on the Williamson-Hall equation, the values of crystallite sizes, lattice strains, dislocation densities, and stacking fault energies were found to be in the range of 27.13-72.59 nm, 4.08 x 10(-5)-1.63 x 10(-3), 1.36 x 10(15)-1.89 x 10(14) lines per m(2) and 3.82 x 10(- 3)- 1.87 x 10(-3) for the pure CZO nanopowders and 3.70 wt% CZO films, respectively. The first direct-band gap bowing parameter decreased from 5.773 eV for pure PVA to 3.117 eV for 3.70 wt% CZO. The second direct band gaps were observed at 2.741, 2.523, and 2.413 eV for the 1.85 wt% CZO, 2.78 wt% CZO, and 3.70 wt% CZO films, respectively. The first values of indirect band gaps were observed in the range of 4.708 eV for pure PVA to 3.931 eV for 3.70 wt% CZO films. The second indirect values were observed in the range of 1.651 eV for 0.18 wt % CZO to 0.599 eV for 3.70 wt% CZO films. The limiting effect of CZO-PVA NCPSFs was also affected by the doping concentration of CZO nanopowder. The values of Rb, Q, and sDC parameters were found to be in the range 7.08 x 10(7)-3.89 x 10(8)O, 9.03 x 10(-11)-6.03 x 10(-11) F, and 5.755 x 10(-8)-1.047 x 10(-8) S/m for pure PVA and 3.70 wt % CZO films. Our results provide valuable insights into designing and optimizing CZO-PVA NCPSFs for optical sensing electronic applications.

Automated summary

The casting aqueous solution technique was used to prepare Co: ZnO incorporated PVA nanocomposite polymer system films with different wt % CZO nanopowders. The values of crystallite sizes, lattice strains, dislocation densities, and stacking fault energies were determined and found to vary with different concentration of CZO nanopowders. The optical properties of the CZO-PVA NCPSFs were also characterized, including band gaps and doping effects. The research provides valuable insights for the design and optimization of CZO-PVA NCPSFs for optical sensing electronic applications.