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Optical band gap modulation in functionalized chitosan biopolymer hybrids using absorption and derivative spectrum
Dyari M Mamand1, Dana S Muhammad2, Daron Q Muheddin3
1Department of Physics, College of Science, University of Raparin, Sulaymaniyah, Kurdistan, Iraq.
Scientific Reports
|January 25, 2025
Summary
Chitosan composites functionalized with manganese complexes and black tea dyes exhibit enhanced optical properties, including reduced band gaps and increased nonlinear optical susceptibility. These modified biopolymers show potential for advanced optical applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Optoelectronics
Background:
- Chitosan (CS) is a versatile biopolymer with potential for optical applications.
- Enhancing the optical properties of chitosan is crucial for advanced material development.
- Metal complexes and natural dyes offer pathways for functionalizing biopolymers.
Purpose of the Study:
- To functionalize chitosan-based biopolymer composites with Manganese (Mn2+) metal complexes and black tea dyes.
- To investigate the impact of this functionalization on the optical properties of the resulting polymer hybrids.
- To explore the potential of these modified composites for optoelectronic applications.
Main Methods:
- Synthesis of chitosan (CS) biopolymer composites.
- Functionalization using Manganese (Mn2+) metal complexes and black tea solution dyes.
- Characterization of optical properties using techniques such as UV-Vis spectroscopy, refractive index measurements, and modeling (Lorentz-Drude, W-D, Tauc, ASF).
Main Results:
- Chitosan composites functionalized with Mn2+-complexes exhibited significantly reduced optical band gaps (from 6.24 eV to 1.21 eV).
- Doped CS films showed increased charge carriers, traps, Urbach energy, and nonlinear optical susceptibility.
- Optical parameters such as refractive index, dielectric constant, optical moments, mobility, resistivity, and susceptibility were modulated by the functionalization.
Conclusions:
- Functionalization of chitosan with Manganese complexes and black tea dyes effectively enhances optical properties.
- The modified biopolymer composites demonstrate tunable optical characteristics, including reduced band gaps and increased nonlinear optical responses.
- These results highlight the potential of these functionalized chitosan composites for applications in optoelectronics and photonics.
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