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This study synthesises ZnO nanoparticles via a wet chemical sol-gel method and prepares PVA-ZnO nanocomposite films through solution casting. Characterisation focuses on optical, thermal, and antibacterial properties. UV-Vis analysis confirms ZnO formation with a 325 nm peak and a band gap of approximately 3.3 eV, demonstrating the composite's potential for UV shielding and antimicrobial applications.