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<p>In this study, PDCBMA (Poly(2-{[(2,4-chlorophenyl)methyl]amino}-2-oxoethyl-2-methylprop-2-enoate) and chitosan (CS) based nanocomposites incorporating biologically synthesized silver (Ag NPs) and zinc oxide (ZnO NPs) nanoparticles were synthesized and comprehensively characterized. FTIR, XRD, SEM, and TEM analyses confirmed the homogeneous distribution of nanoparticles within the polymer matrix and the formation of strong interfacial interactions. Dielectric analyses revealed that the undoped PDCBMA–CS matrix exhibited a low dielectric constant (ε = 2–3), low conductivity, and high impedance. With Ag NPs added, ε′ values ​​increased (ε′ = 3.0–4.0), and the loss factor (ε″) and loss tangent (tan δ) reached a maximum at mid-frequency. This indicates an increase in carrier density and polarization capacity. With ZnO NPs doping, ε′ and ε″ values ​​decreased (ε′ = 3.3–3.8 → 3.2–3.4), and tan δ values ​​were lower. This suggests that ZnO NPs form more stable and low-loss structures at the interface. AC conductivity (σ<sub>ac</sub>) analyses revealed that σac of 10⁻<sup>3</sup> S/cm was achieved at high frequencies in Ag-doped systems, whereas capacitive properties dominated in ZnO-added systems, resulting in lower conductivity. Optical analyses revealed a localized surface plasmon resonance (LSPR) band at 406&#xa0;nm in Ag-NPs-added systems and a sharp absorption edge at 360&#xa0;nm in ZnO-NPs-added systems. LSPR intensity decreased and peak broadening increased with increasing Ag NPs content; however, with the addition of ZnO, the edge position was maintained, and its intensity increased. The results suggest that Ag NPs-added nanocomposites are strong candidates for plasmonic sensors, optoelectronic waveguides, and conductive coatings, while ZnO NPs-added systems are strong candidates for UV-blocking coatings, transparent dielectric layers, and low-loss energy storage applications.</p>

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Surface-Enhanced Optical and Electrical Performance of CS-Based Nanocomposites Containing Ag-ZnO: A Structural and Morphological Perspective

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • İbrahim Erol,
  • Gofur Khamidov,
  • Turan Mutlu

摘要

In this study, PDCBMA (Poly(2-{[(2,4-chlorophenyl)methyl]amino}-2-oxoethyl-2-methylprop-2-enoate) and chitosan (CS) based nanocomposites incorporating biologically synthesized silver (Ag NPs) and zinc oxide (ZnO NPs) nanoparticles were synthesized and comprehensively characterized. FTIR, XRD, SEM, and TEM analyses confirmed the homogeneous distribution of nanoparticles within the polymer matrix and the formation of strong interfacial interactions. Dielectric analyses revealed that the undoped PDCBMA–CS matrix exhibited a low dielectric constant (ε = 2–3), low conductivity, and high impedance. With Ag NPs added, ε′ values ​​increased (ε′ = 3.0–4.0), and the loss factor (ε″) and loss tangent (tan δ) reached a maximum at mid-frequency. This indicates an increase in carrier density and polarization capacity. With ZnO NPs doping, ε′ and ε″ values ​​decreased (ε′ = 3.3–3.8 → 3.2–3.4), and tan δ values ​​were lower. This suggests that ZnO NPs form more stable and low-loss structures at the interface. AC conductivity (σac) analyses revealed that σac of 10⁻3 S/cm was achieved at high frequencies in Ag-doped systems, whereas capacitive properties dominated in ZnO-added systems, resulting in lower conductivity. Optical analyses revealed a localized surface plasmon resonance (LSPR) band at 406 nm in Ag-NPs-added systems and a sharp absorption edge at 360 nm in ZnO-NPs-added systems. LSPR intensity decreased and peak broadening increased with increasing Ag NPs content; however, with the addition of ZnO, the edge position was maintained, and its intensity increased. The results suggest that Ag NPs-added nanocomposites are strong candidates for plasmonic sensors, optoelectronic waveguides, and conductive coatings, while ZnO NPs-added systems are strong candidates for UV-blocking coatings, transparent dielectric layers, and low-loss energy storage applications.