Optical and physical characteristics of chitosan/silver vanadate nanocomposites

Abstract

AbstractChitosan/AgVO3 nanocomposite thin films were synthesized via solution casting method using water as solvent. Silver vanadate (AgVO3) nanoparticles were prepared separately using a chemical precipitation technique. The structure and properties of the nanocomposite films were investigated using Fourier transform infrared spectroscopy (FTIR), UV–visible spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), swelling ratio tests, and antimicrobial assays. FTIR analysis confirmed the interaction between the amide I group of chitosan and AgVO3 nanoparticles. Increasing AgVO3 content resulted in decreased optical bandgap of the nanocomposite films. XRD patterns showed the amorphous nature of the nanocomposites. SEM images revealed evenly distributed AgVO3 nanoparticles within the chitosan matrix. The swelling ratio decreased with higher AgVO3 loading, suggesting improved hydrolytic stability. The nanocomposite films demonstrated potent antimicrobial activity against gram-positive and gram-negative bacteria as well as Candida fungus. The tunable optical properties, swelling behavior, and antibacterial effects spotlight the potential of chitosan/AgVO3 nanocomposites for versatile biomedical applications.