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.

Autor: Aziz DM; Department of Chemistry, College of Science, University of Raparin, Ranya 46012, Kurdistan Region, Iraq., Mohammed SJ; Anesthesia Department, College of Health Sciences, Cihan University Sulaimaniya, Sulaimaniya 46001, Kurdistan Region, Iraq; Department of Chemistry, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani, 46002, Kurdistan Regional Government, Iraq., Mohammed PA; Department of Physics, College of Science, Charmo University, 46023, Chamchamal, Sulaymaniyah, Iraq., Al-Zangana S; Department of Physics, College of Education, University of Garmian, Kalar 46021, Kurdistan Regional Government, Iraq., Aziz SB; Research and Development Center, University of Sulaimani, Qlyasan Street, Kurdistan Regional Government, Sulaymaniyah, 46001, Iraq. Electronic address: shujahadeenaziz@gmail.com., Muhammad DS; Department of Physics, College of Education, University of Sulaimani, Sulaymaniyah, 46001, Kurdistan Region, Iraq., Abdulwahid RT; Department of Physics, College of Education, University of Sulaimani, Sulaymaniyah, 46001, Kurdistan Region, Iraq., Darwesh AHA; Hameed Majid Advanced Polymeric Materials Research Lab., Physics Department, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani 46001, Kurdistan Regional Government, Iraq., Hussein SA; Hameed Majid Advanced Polymeric Materials Research Lab., Physics Department, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani 46001, Kurdistan Regional Government, Iraq.
Jazyk: angličtina
Zdroj: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy [Spectrochim Acta A Mol Biomol Spectrosc] 2025 Jan 15; Vol. 325, pp. 125142. Date of Electronic Publication: 2024 Sep 14.
DOI: 10.1016/j.saa.2024.125142
Abstrakt: This study investigates the effect of a natural dye extracted from common poppy (Papaver rhoeas) waste flowers on the optical properties of chitosan (CS) films. The extraction of natural dyes from waste flowers can be considered a new field for research in green chemistry. CS films are flexible and biodegradable but have low optical activity and band gap, limiting their applications in optical devices. The doped CS polymer with different concentrations of Papaver rhoeas dye exhibited enhanced optical properties. Also, 30 % glycerol was added as a plasticizer to omit film brittleness. The FTIR examinations is helpful to propose a mechanism that explains the interaction of the dye with the host polymer. The UV-vis spectroscopic examination establish that the optical characteristics of the films can be modified by adjusting the dye concentration. Furthermore, optical absorption properties are described using the Tauc non-direct transition model, revealing an approximate optical band gap of 1.64 eV. This band gap defines the energy required for electron transitions, elucidating the material's electronic characteristics. The extinction coefficient (k) and refractive index (n) of the CS-doped films' shows a dispersion behavior at visible regions of EM radiation. The Wemple-DiDomenico single oscillator model was used to investigate the n dispersion and determine the oscillator energy equivalent to the optical band gap. Additionally, calculations have been performed on optical dielectric properties and optical conductivity. The Urbach energy was measured and used to detect the structure of the films. The findings underscore the potential applications of these natural dye-doped CS films in eco-friendly materials and optical devices.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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