Studies on ionic conductivity, linear and non-linear optical properties of ecofriendly methyl cellulose: sodium bromide based solid polymer blend electrolytes

Abstract

Biopolymer electrolytes based on methyl cellulose (MC) and sodium bromide(NaBr) have been prepared through solvent casting technique. Both the concentrations of MC and NaBr are varied. The prepared biopolymer electrolytes have been subjected to AC impedance and UV-Vis spectroscopic techniques. The ionic conductivity reached a maximum value of 4.84 × 10⁻⁸ Scm⁻¹ for 0.8 g of MC and 0.2 g of NaBr. UV studies revealed that low direct and indirect band gaps have been observed for the maximum ionic conducting sample. Other optical parameters, such as refractive index, extinction coefficient, skin depth, and optical conductivity, have been estimated. The single-oscillator energy (E_o) and dispersion energy (E_d) for all the prepared biopolymer electrolyte samples were calculated with the help of Wemple and DiDomenico single oscillator model. The higher-order non-linear susceptibility values were also calculated. Polymer electrolytes are found to be suitable for optical and electronic devices.

Graphical Abstract

Keywords:

• Absorption edge
• methyl cellulose
• refractive index
• single-oscillator energy
• ionic conductivity

Acknowledgments

This research was supported and funded by Researchers Supporting Project number (RSPD2024R645), King Saud University, Riyadh, Saudi Arabia.

Authors contributions

All authors contributed to the study's conception and design. Material preparation and data collection were performed by S. Jayanthi. The second author S. Shenbagavalli analyzed the data. The third author M. Muthuvinayagam supervised and corrected the article. The first draft of the manuscript was written by S. Jayanthi with all authors support. The fourth and fifth authors Khalid A. Alrashidi, Saikh Mohammad helped for characterization through their projects. All authors read and approved the final manuscript. All authors agree with this statement.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Correction Statement

This article has been corrected with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

This research was supported by Researchers Supporting Project number (RSPD2024R645), King Saud University, Riyadh, Saudi Arabia.