Enhancement of Molecular Structural and Linear/Nonlinear Optical Features of Chitosan/Titanium Dioxide Nanocomposite Films for Food Packaging and Optoelectronic Applications

  • Osiris Guirguis Biophysics Department, Faculty of Science, Cairo University, Giza, Egypt https://orcid.org/0000-0003-3670-2904
  • Najlaa D. Alharbi Department of Physical Sciences, College of Science, University of Jeddah, Jeddah, Saudi Arabia
DOI: https://doi.org/10.26565/2312-4334-2024-4-57
Keywords: Chitosan, TiO2 Nanoparticles, Chitosan/TiO2 Nanocomposites, FTIR Analysis, Thermal Stability, Linear/nonlinear Optical Properties

Abstract

The current study aims to synthesize and characterize nanocomposite films of chitosan and titanium dioxide in terms of molecular structure, thermal and optical properties for use in food packaging and optoelectronic applications. The Fourier-transform infrared (FTIR) spectroscopy was used to study the interaction between the TiO2-NPs and chitosan and the analysis confirmed that TiO2-NPs interacted with chitosan and demonstrated good compatibility. Differential scanning calorimetry and thermogravimetric analysis revealed that increasing the concentration of TiO2-NPs improved the thermal stability of the nanocomposites. The linear optical properties in the UV-Vis range (200–800 nm) were measured spectrophotometrically. Below 400 nm, the transmittance spectra of the nanocomposites show decreased degrees of transparency, indicating their capacity to entirely block UV-light transmission. Tauc's model was used to identify the types of electronic transitions in the samples. The single-oscillator model was utilized to investigate the dispersion energy and parameters. Nonlinear optical properties were also investigated. UV-Vis in the region (360-410 nm), the analysis revealed that increasing the concentration of TiO2-NPs from 0 to 12 wt% reduced the absorption edge from 2.716 to 2.043 eV, decreased the direct (3.282 to 2.798 eV) and indirect (2.417 to 1.581 eV) energy band gaps, increased the Urbach energy from 0.692 to 1.295 eV, decreased the dispersion energy from 11.324 to 5.621 eV, decreased the single oscillator energy from 6.308 to 5.393 eV, and improved the other linear and nonlinear parameters. The findings support the usage of CS/TiO2 nanocomposite films in the packaging industry and a variety of optical applications.

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Published
2024-12-08
Cited
How to Cite
Guirguis, O., & Alharbi, N. D. (2024). Enhancement of Molecular Structural and Linear/Nonlinear Optical Features of Chitosan/Titanium Dioxide Nanocomposite Films for Food Packaging and Optoelectronic Applications. East European Journal of Physics, (4), 469-490. https://doi.org/10.26565/2312-4334-2024-4-57
Issue
No. 4 (2024): East European Journal of Physics
Section
Original Papers

Copyright (c) 2024 Osiris W. Guirguis, Najlaa D. Alharbi

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