Celebrating International Accounting Day at Cihan University- Sulaimaniya
Assist. Prof. Dr. Sewara J. Mohammed, a lecturer, and researcher at Cihan University Sulaimaniya, recently authored a groundbreaking research article entitled “Spectroscopic study of wemple-didomenico empirical formula and taucs model to determine the optical band gap of dye-doped polymer based on chitosan: Common poppy dye as a novel approach to reduce the optical band gap of biopolymer” This significant contribution has been prominently featured by the reputable international publisher Elsevier, specifically in the Spectrochimica Acta Part A:
Molecular and Biomolecular Spectroscopy. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy an impressive impact factor of 4.3 and holds a distinguished position in the second quartile (Q2), recognized by both Clarivate and Web of Science.
In our research, we investigated the effect of a natural dye extracted from common poppy (Papaver rhoeas) waste flowers on the optical properties of chitosan (CS) films. CS films, though flexible and biodegradable, have limited optical activity and band gap, restricting their use in optical devices. By doping CS with varying concentrations of Papaver rhoeas dye and adding 30% glycerol as a plasticizer to reduce brittleness, we enhanced the films’ optical properties. FTIR analysis helped explain the dye-polymer interaction, while UV–vis spectroscopy showed that adjusting dye concentration modified the optical characteristics. Using the Tauc model, we determined an approximate band gap of 1.64 eV, and the Wemple-DiDomenico model was applied to study the refractive index dispersion. We also calculated optical dielectric properties, conductivity, and Urbach energy to further understand the film structure. These results highlight the potential of natural dye-doped CS films in eco-friendly materials and optical devices.
https://doi.org/10.1016/j.saa.2024.125142
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