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<p>Polymethyl methacrylate (PMMA) nanoparticles (NPs) integrated with alumina (Al<sub>2</sub>O<sub>3</sub>) nanocomposite films were prepared using a solution-casting method. XRD, FTIR, SEM, and TEM analyses were used to characterize the obtained composite films. The study investigated the impact of Al<sub>2</sub>O<sub>3</sub> nanoparticles (Al<sub>2</sub>O<sub>3</sub> NPs) on the optical characteristics of the PMMA polymeric matrix using UV–Vis-NIR optical spectroscopy. The fabricated films demonstrated unique light-blocking capabilities within a range of 190–275&#xa0;nm. Optical energy gaps changed dramatically when Al<sub>2</sub>O<sub>3</sub> nanoparticles were added to polymeric chains of PMMA. The direct optical gap decreased from 4.95 to 4.85&#xa0;eV, while the indirect optical gap decreased from 4.78 to 4.5&#xa0;eV. The behavior of the Urbach energy (E<sub>U</sub>) increases with increasing Al<sub>2</sub>O<sub>3</sub> NP loading. The study demonstrated remarkable optical limiting capabilities using two laser sources with wavelengths of 632.8&#xa0;nm and 533&#xa0;nm. The inclusion of Al<sub>2</sub>O<sub>3</sub> NPs resulted in an enhanced dielectric constant, indicating increased polarization of particles within polymeric films at reduced frequencies. As Al<sub>2</sub>O<sub>3</sub> NPs content and frequency increased, AC conductivity also increased. PMMA/Al<sub>2</sub>O<sub>3</sub> composite films demonstrated a photocatalytic degradation efficiency of 96.15% and a reaction rate constant of 0.0284&#xa0;min<sup>−1</sup> in degradation of RhB dye with (1.66&#xa0;wt.%) alumina content exhibited the highest efficacy under UVA light. <sup><b>·</b></sup>OH radicals are the reactive species responsible for the degradation of RhB dye. These promising outcomes suggest the potential multifunctional applications of Al<sub>2</sub>O<sub>3</sub>/PMMA nanocomposite films, including their use as laser optical limiters and photocatalytic membranes for wastewater treatment, reinforcing their utility in various domains.</p> Graphical abstract <p></p>

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Multifunctional applications of alumina (Al2O3) nanofiller-doped PMMA films: evaluation of nanocomposite films for electronic, optoelectronic, and environmental photocatalytic applications

  • 期刊论文

  • 发表日期：

    2025年8月17日

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  • Ahmed T. Mosleh,
  • H. Y. Zahran,
  • I. S. Yahia,
  • Elbadawy A. Kamoun,
  • Mahmoud Abdel-Aty,
  • M. Alfiras,
  • Mohamed Hafez Ahmed,
  • Shawkat Alkhazaleh,
  • M. I. Mohammed,
  • Mai S. A. Hussien

摘要

Polymethyl methacrylate (PMMA) nanoparticles (NPs) integrated with alumina (Al2O3) nanocomposite films were prepared using a solution-casting method. XRD, FTIR, SEM, and TEM analyses were used to characterize the obtained composite films. The study investigated the impact of Al2O3 nanoparticles (Al2O3 NPs) on the optical characteristics of the PMMA polymeric matrix using UV–Vis-NIR optical spectroscopy. The fabricated films demonstrated unique light-blocking capabilities within a range of 190–275 nm. Optical energy gaps changed dramatically when Al2O3 nanoparticles were added to polymeric chains of PMMA. The direct optical gap decreased from 4.95 to 4.85 eV, while the indirect optical gap decreased from 4.78 to 4.5 eV. The behavior of the Urbach energy (EU) increases with increasing Al2O3 NP loading. The study demonstrated remarkable optical limiting capabilities using two laser sources with wavelengths of 632.8 nm and 533 nm. The inclusion of Al2O3 NPs resulted in an enhanced dielectric constant, indicating increased polarization of particles within polymeric films at reduced frequencies. As Al2O3 NPs content and frequency increased, AC conductivity also increased. PMMA/Al2O3 composite films demonstrated a photocatalytic degradation efficiency of 96.15% and a reaction rate constant of 0.0284 min−1 in degradation of RhB dye with (1.66 wt.%) alumina content exhibited the highest efficacy under UVA light. ·OH radicals are the reactive species responsible for the degradation of RhB dye. These promising outcomes suggest the potential multifunctional applications of Al2O3/PMMA nanocomposite films, including their use as laser optical limiters and photocatalytic membranes for wastewater treatment, reinforcing their utility in various domains.

Graphical abstract