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<p>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&#xa0;eV for PVA/Cs blend to 3.38/4.78&#xa0;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<sup>(3)</sup>) and nonlinear refractive index, n<sub>2</sub> are enhanced and increased from (0.025 × 10<sup>–12</sup>/0.612 × 10<sup>−12</sup> esu) for PVA/Cs blend to (4.874 × 10<sup>–12</sup>/2.413 × 10<sup>–12</sup> 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.</p>

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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月26日

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  • H. Elhendawi,
  • R. M. Ramadan,
  • M. S. Abdel-Aziz,
  • T. Fahmy,
  • A. M. Ali

摘要

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.