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<p>The growing demand for flexible, high-performance materials in optoelectronics and energy storage has driven interest in polymer nanocomposites with tunable optical and dielectric properties. This study aims to enhance the structural, optical, and dielectric performance of polymethyl methacrylate (PMMA) by incorporating lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and indium-doped zinc tungstate (ZnW₁₋<sub><i>x</i></sub>In<sub><i>x</i></sub>O₄) nanofillers. The composites were fabricated using solution casting for the polymer matrix and solid-state reaction for the nanofillers. Structural and morphological analyses confirmed successful integration of the fillers into the PMMA matrix. Key optical findings reveal a substantial reduction in both direct and indirect bandgaps—from 5.07 to 4.87 eV for pure PMMA to as low as 3.83 eV and 3.52 eV, respectively—along with enhanced refractive index, optical conductivity, and nonlinear optical response, particularly for fillers with <i>x</i> = 0 and 0.1. Dielectrically, the incorporation of ZnWO<sub>4</sub> significantly increased the real and imaginary permittivity values (13.827 and 0.684 at 1 kHz) compared to undoped PMMA (10.234 and 0.487), while the sample with <i>x</i> = 0.1 exhibited the highest AC conductivity. Argand plot analysis further indicated improved capacitance in LiTFSI-filled samples. These enhancements position the developed composites as promising candidates for UV-protective coatings, photovoltaic cells, flexible energy storage devices, and advanced photonic applications.</p>

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Modifying the optical and dielectric features of a PMMA-LiTFSI composite with ZnW1₋xInxO4 nanofillers

  • 期刊论文

  • 发表日期：

    2026年5月3日

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  • Ali A. Alhazime

摘要

The growing demand for flexible, high-performance materials in optoelectronics and energy storage has driven interest in polymer nanocomposites with tunable optical and dielectric properties. This study aims to enhance the structural, optical, and dielectric performance of polymethyl methacrylate (PMMA) by incorporating lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and indium-doped zinc tungstate (ZnW₁₋xInxO₄) nanofillers. The composites were fabricated using solution casting for the polymer matrix and solid-state reaction for the nanofillers. Structural and morphological analyses confirmed successful integration of the fillers into the PMMA matrix. Key optical findings reveal a substantial reduction in both direct and indirect bandgaps—from 5.07 to 4.87 eV for pure PMMA to as low as 3.83 eV and 3.52 eV, respectively—along with enhanced refractive index, optical conductivity, and nonlinear optical response, particularly for fillers with x = 0 and 0.1. Dielectrically, the incorporation of ZnWO4 significantly increased the real and imaginary permittivity values (13.827 and 0.684 at 1 kHz) compared to undoped PMMA (10.234 and 0.487), while the sample with x = 0.1 exhibited the highest AC conductivity. Argand plot analysis further indicated improved capacitance in LiTFSI-filled samples. These enhancements position the developed composites as promising candidates for UV-protective coatings, photovoltaic cells, flexible energy storage devices, and advanced photonic applications.