Enhancement of the structure and linear/nonlinear optical properties of PVA/chitosan/Ag nanocomposites for optoelectronic and antibacterial applications

Résumé

Abstract Polyvinyl alcohol/chitosan/silver (PVA/Cs/Ag) nanocomposites are prepared using casting method for eco-friendly applications. The microstructure and optical properties are investigated using X-ray diffraction, Fourier transform infrared and UV/Vis spectroscopy. XRD analysis revealed that the structural parameters such as lattice strain, crystallites per unit area, dislocation density and stacking fault are affected upon incorporating AgNPs. UV/Vis measurements exhibited that the indirect and direct optical bandgap are reduced from 4.34/5.22 eV for PVA/Cs blend to 3.38/4.78 eV for PVA/Cs/1wt%Ag nanocomposite. Analysis of Wemple-DiDomenico model exhibited clear enrichment of the linear/nonlinear parameters and it is found that the third order nonlinear optical parameter (χ(3)) and nonlinear refractive index, n2 are enhanced and increased from (0.025 × 10–12/0.612 × 10−12 esu) for PVA/Cs blend to (4.874 × 10–12/2.413 × 10–12 esu) for PVA/Cs/1wt%Ag nanocomposite. The significant decrease in the energy gap as well as the remarkable change in the nonlinear optical parameters make these materials a strong candidate for many applications in the optoelectronic field. Antibacterial activity measurements strongly suggest that these nanocomposites could be used in the fabrication of antibacterial devices with biomedical applications.

Citer ce document

Accès au document

Texte intégral en lecture en ligne, réservé aux abonnés SPHAERO et aux membres de l'institution. Se connecter

Auteur(s)

Statistiques

Consultations : 1

Téléchargements : 0