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<p>This work was aimed to examine the effect of multi-walled carbon nanotubes (MWCNT) at different concentrations on the structural and optical properties of polyvinyl alcohol (PVA)/titanium dioxide (TiO<sub>2</sub>) nanocomposite films fabricated by the casting solution method. The synthesized nanocomposite films were investigated by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The FTIR spectra indicated significant band shifting and reduced transmittance intensity in the doped materials. This indicated the formation of the hydrogen bond between the matrix and the dopant. The linear and nonlinear optical properties of the as-deposited films in the wavelength range of 200–2500&#xa0;nm were assessed using spectrophotometric methods. The indirect energy gap of PVA is 4.8&#xa0;eV. This value was decreased due to the doping of PVA with TiO<sub>2</sub>@MWCNT. Using the single-oscillator model, the refractive index dispersion under normal dispersion was investigated. We assessed and examined how different MWCNT concentrations affected the optical dielectric characterizations. Semi-empirical relations were used to determine the impact of MWCNT concentrations on nonlinear parameters, such as nonlinear absorption coefficient (<i>β</i><sub>c</sub>), nonlinear refractive index <i>n</i><sub>2</sub>, and third-order nonlinear susceptibility <i>χ</i><sup>(3)</sup>. Finally, the PVA/TiO<sub>2</sub>@MWCNT films exhibit favorable attributes, including linear and nonlinear optical properties, energy loss functions, and optical conductivity. These characteristics make them very suitable for integration into flexible photonic and optoelectronic devices.</p>

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Influence of multi-walled carbon nanotubes on structural and linear/nonlinear optical properties of PVA/TiO2 films for flexible optoelectronic devices

  • 期刊论文

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  • 发表日期：

    2025年7月1日

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  • Hoda El-Nagar,
  • M. S. Abd El-sadek,
  • E. M. M. Ibrahim,
  • Sahar Elnobi

摘要

This work was aimed to examine the effect of multi-walled carbon nanotubes (MWCNT) at different concentrations on the structural and optical properties of polyvinyl alcohol (PVA)/titanium dioxide (TiO2) nanocomposite films fabricated by the casting solution method. The synthesized nanocomposite films were investigated by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The FTIR spectra indicated significant band shifting and reduced transmittance intensity in the doped materials. This indicated the formation of the hydrogen bond between the matrix and the dopant. The linear and nonlinear optical properties of the as-deposited films in the wavelength range of 200–2500 nm were assessed using spectrophotometric methods. The indirect energy gap of PVA is 4.8 eV. This value was decreased due to the doping of PVA with TiO2@MWCNT. Using the single-oscillator model, the refractive index dispersion under normal dispersion was investigated. We assessed and examined how different MWCNT concentrations affected the optical dielectric characterizations. Semi-empirical relations were used to determine the impact of MWCNT concentrations on nonlinear parameters, such as nonlinear absorption coefficient (βc), nonlinear refractive index n2, and third-order nonlinear susceptibility χ(3). Finally, the PVA/TiO2@MWCNT films exhibit favorable attributes, including linear and nonlinear optical properties, energy loss functions, and optical conductivity. These characteristics make them very suitable for integration into flexible photonic and optoelectronic devices.