Abstract
The article demonstrates the feasibility of tuning the optical and electrical properties of polyvinyl alcohol (PVA) by adding different wt% of TiO2 nanoparticles (0.001–0.01 wt%). UV–visible, photoluminescence and LCR spectroscopies techniques were used. UV–visible measurements of PVA/TiO2 membranes displayed a shift in the absorbance edge across the region of longer wavelength. This reflects a decrease in the bandgap energy, which indicates an increase in the electrical AC conductivity of the samples. Furthermore, the transmittance of a pure PVA membrane decreases from 85% for pure PVA to 3% for PVA/TiO2 with 0.01 wt%. In addition, an amendment was observed in the optical parameters of nanocomposite membranes. The photoluminescence emission spectra exhibited a luminescence response of the PVA/TiO2 samples and significant emission bands were generated with the increase in the TiO2 nanoparticles. With increasing TiO2 nanoparticles, an increase in the AC conductivity and an improvement in the dielectric parameters of the samples were observed. The electric modulus was calculated and used to evaluate the relaxation behaviour in the nanocomposite membranes.
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Zaki, M.F., Tayel, A. & El Basaty, A.B. Tuning the optical properties, AC conductivity and dielectric modulus of PVA membrane by inclusion of TiO2 nanoparticles. Bull Mater Sci 45, 236 (2022). https://doi.org/10.1007/s12034-022-02816-z
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DOI: https://doi.org/10.1007/s12034-022-02816-z