Electrical conductivity and dielectric properties of tellurium (IV) oxide and copper oxide nanoparticles doped in PVA-Chitosan nanocomposite and their potential for optoelectronics devices

Polyvinyl Alcohol (PVA) and Chitosan were combined with tellurium (IV) oxide (Te₂O₄) and copper oxide (CuO) nanoparticles to create a PVA/Chitosan–Te₂O₄/CuO nanocomposite, aiming to enhance its structural, thermal, and electrical properties. Te₂O₄ and CuO nanoparticles were synthesized using laser ablation. The study examined how varying CuO nanoparticle concentrations affected the electrical properties of the films. XRD analysis confirmed the presence of Te₂O₄ and CuO with their respective crystal structures. FTIR results indicated interactions between PVA/Chitosan matrix and Te₂O₄/CuO nanoparticles, evidenced by a reduced absorption band. SEM images showed well-distributed CuO nanoparticles within the PVA/Chitosan matrix. Optical data revealed an absorption edge at 216 nm, related to electronic transitions, and increased absorption with longer CuO laser ablation times. Thermal analysis showed that the nanocomposite decomposed at higher temperatures (550–600 °C) with greater mass loss compared to the pure blend, suggesting improved thermal stability. Additionally, the nanocomposite exhibited higher real conductivity, indicating enhanced charge transport due to the Te₂O₄/CuO nanoparticles.