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<p>PVA, Silver-PVA&#xa0;(PVA-Ag), and Silver-PVA-ionic liquid (PVA-Ag-IL) composites were successfully synthesized and characterized to evaluate their structural, optical, morphological, electrical, and antibacterial properties&#xa0;using techniques such as FTIR, SEM, UV–Visible DRS, XRD, and NMR. The UV-DRS analysis showed a significant reduction in band gap from 3.38 (PVA) to 2.06&#xa0;eV (PVA-Ag-IL), indicating improved light absorption. SEM and elemental mapping confirmed uniform dispersion of Ag in the IL-enhanced matrix. Electrical studies revealed that PVA-Ag-IL exhibited superior conductivity (σ<sub>AC</sub> ~ 10⁻⁶ S/cm) and reduced impedance (R₁ = 8.68 × 10<sup>5</sup> Ω·cm<sup>2</sup>), as confirmed by Nyquist plot analysis. The MIC values for PVA-Ag-IL were 1.4&#xa0;mg/mL for <i>S. aureus</i> and 2.2&#xa0;mg/mL for <i>E. coli</i>, significantly lower than the other two materials. Zone of inhibition diameters reached up to 21&#xa0;mm for <i>E. coli</i> and 19&#xa0;mm for <i>S. aureus</i>. Furthermore, PVA-Ag-IL films showed enhanced antioxidant activity (~ 73% DPPH inhibition) and low hemolysis (&lt; 5%), confirming their biocompatibility. These results demonstrate the multifunctionality of PVA-Ag-IL films, making them highly promising for applications in antimicrobial coatings, wound healing, and bioelectronic devices.</p>

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Multifunctional polyvinyl alcohol/ionic liquid/silver composite for biomedical and electrical applications

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Itishree Panda,
  • Swayam Aryam Behera

摘要

PVA, Silver-PVA (PVA-Ag), and Silver-PVA-ionic liquid (PVA-Ag-IL) composites were successfully synthesized and characterized to evaluate their structural, optical, morphological, electrical, and antibacterial properties using techniques such as FTIR, SEM, UV–Visible DRS, XRD, and NMR. The UV-DRS analysis showed a significant reduction in band gap from 3.38 (PVA) to 2.06 eV (PVA-Ag-IL), indicating improved light absorption. SEM and elemental mapping confirmed uniform dispersion of Ag in the IL-enhanced matrix. Electrical studies revealed that PVA-Ag-IL exhibited superior conductivity (σAC ~ 10⁻⁶ S/cm) and reduced impedance (R₁ = 8.68 × 105 Ω·cm2), as confirmed by Nyquist plot analysis. The MIC values for PVA-Ag-IL were 1.4 mg/mL for S. aureus and 2.2 mg/mL for E. coli, significantly lower than the other two materials. Zone of inhibition diameters reached up to 21 mm for E. coli and 19 mm for S. aureus. Furthermore, PVA-Ag-IL films showed enhanced antioxidant activity (~ 73% DPPH inhibition) and low hemolysis (< 5%), confirming their biocompatibility. These results demonstrate the multifunctionality of PVA-Ag-IL films, making them highly promising for applications in antimicrobial coatings, wound healing, and bioelectronic devices.