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<p>Copper oxide/titanium dioxide nanoparticles (CuO/TiO<sub>2</sub> NP) were synthesized by precipitation. The polymer nanocomposites (PNCs) were prepared using the casting technique, incorporating Hydroxypropyl methylcellulose (HPMC) and polyethylene oxide (PEO) with varying concentrations of CuO/TiO<sub>2</sub> nanoparticles: 2, 4, and 8 wt%. X-ray diffraction (XRD) analysis demonstrated a reduction in the crystallinity of the PNCs, highlighting changes in their microcrystalline properties. FT-IR spectroscopy confirmed the successful formation of the nanocomposites and identified the functional groups present. The optical properties were examined with a UV–Vis spectrophotometer, and each film’s absorbance coefficient was calculated. Incorporating 8% CuO/TiO<sub>2</sub> into the HPMC/PEO matrix reduced the bandgap energies (<i>E</i><sub>gd</sub> and <i>E</i><sub>gin</sub>) of pure HPMC/PEO to 3.06&#xa0;eV and 0.63&#xa0;eV, respectively. The Urbach energy (<i>E</i>u) values increased from 0.225 ± 0.022&#xa0;eV to 0.423 ± 0.052&#xa0;eV as the CuO/TiO<sub>2</sub> concentration increased from 0 to 8 wt%. Adding CuO/TiO<sub>2</sub> NP to the HPMC/PEO matrix significantly improved charge conduction, as evidenced by enhanced conductivity results in the filled samples. With increasing frequency, both the dielectric constant (<i>ε</i>′) and dielectric loss (<i>ε</i>″) decreased. Impedance studies revealed that increasing the CuO/TiO<sub>2</sub> concentration from 0 to 8 wt% reduced the bulk resistance (Rb) from 2.48 × 10<sup>7</sup> Ω to 1.50 × 10<sup>6</sup> Ω, enhancing ionic conductivity and confirming the suitability of the HPMC/PEO–CuO/TiO<sub>2</sub> nanocomposite for microelectronic applications. Overall, the experimental results suggest that the synthesized nanocomposites hold great promise for use in optoelectronic devices and capacitive energy storage systems.</p>

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Synthesis and characterization of copper oxide/titanium dioxide-enhanced polymer nanocomposites for optoelectronic devices

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • H. M. Ragab,
  • N. S. Diab,
  • Azza M. Khaled,
  • Shimaa Mohammed Aboelnaga,
  • S. A. Al-Balawi,
  • A. Al Ojeery,
  • M. O. Farea

摘要

Copper oxide/titanium dioxide nanoparticles (CuO/TiO2 NP) were synthesized by precipitation. The polymer nanocomposites (PNCs) were prepared using the casting technique, incorporating Hydroxypropyl methylcellulose (HPMC) and polyethylene oxide (PEO) with varying concentrations of CuO/TiO2 nanoparticles: 2, 4, and 8 wt%. X-ray diffraction (XRD) analysis demonstrated a reduction in the crystallinity of the PNCs, highlighting changes in their microcrystalline properties. FT-IR spectroscopy confirmed the successful formation of the nanocomposites and identified the functional groups present. The optical properties were examined with a UV–Vis spectrophotometer, and each film’s absorbance coefficient was calculated. Incorporating 8% CuO/TiO2 into the HPMC/PEO matrix reduced the bandgap energies (Egd and Egin) of pure HPMC/PEO to 3.06 eV and 0.63 eV, respectively. The Urbach energy (Eu) values increased from 0.225 ± 0.022 eV to 0.423 ± 0.052 eV as the CuO/TiO2 concentration increased from 0 to 8 wt%. Adding CuO/TiO2 NP to the HPMC/PEO matrix significantly improved charge conduction, as evidenced by enhanced conductivity results in the filled samples. With increasing frequency, both the dielectric constant (ε′) and dielectric loss (ε″) decreased. Impedance studies revealed that increasing the CuO/TiO2 concentration from 0 to 8 wt% reduced the bulk resistance (Rb) from 2.48 × 107 Ω to 1.50 × 106 Ω, enhancing ionic conductivity and confirming the suitability of the HPMC/PEO–CuO/TiO2 nanocomposite for microelectronic applications. Overall, the experimental results suggest that the synthesized nanocomposites hold great promise for use in optoelectronic devices and capacitive energy storage systems.