Effect of disodium phthalocyanine on the structural, optical, electrical, and dielectric properties of PVA/CMC blend towards optoelectronic applications.

In this work, composite films of the polyvinyl alcohol/carboxymethyl cellulose (PVA/CMC) blend (50/50 wt%) doped with various weight percentages of disodium phthalocyanine (NaPc) dye were fabricated utilizing a traditional casting procedure. The structural, morphological, and optical properties of the prepared films were investigated using FT-IR, XRD, SEM, and UV-Vis. FT-IR spectra reveal potential molecular interactions between the NaPc dopants and the polymer blend, which may affect the overall material properties. XRD patterns show that incorporating NaPc dye into the PVA/CMC matrix results in cross-linking, which promotes the amorphous nature of the host matrix. UV-Vis measurements of doped films reveal a broad absorption band at 680 nm. The direct and indirect bandgap values decreased from 4.92 to 4.41 eV and 3.85 to 2.62 eV, respectively, as the NaPc doping ratio increased from 0 to 0.6 wt%. The AC conductivity and dielectric properties of prepared films were also investigated. The results showed a significant improvement in AC conductivity (σ), dielectric constant (ε'), and dielectric loss (ε") with the increasing concentration of NaPc particles. The DC conductivity significantly increased from 5.54 × 10 S/cm to 6.33 × 10 S/cm. The results indicate that biodegradable PVA/CMC-NaPc matrices have potential applications in various technological fields, including energy storage devices and optoelectronic devices like solar cells.