Optical band gap modulation in functionalized chitosan biopolymer hybrids using absorption and derivative spectrum fitting methods: A spectroscopic analysis.

ABSTRACT: In this study, biopolymer composites based on chitosan (CS) with enhanced optical properties were functionalized using Manganese metal complexes and black tea solution dyes. The results indicate that CS with Mn²⁺-complexes can produce polymer hybrids with high absorption, high refractive index and controlled optical band gaps, with a significant reduction from 6.24 eV to 1.21 eV. The refractive index and optical dielectric constant measurements show that the doped CS films have more charge carriers and traps than those in pure CS films. The Lorentz-Drude model was used to derive several significant optical parameters, and the W-D model was utilized to calculate the optical moments M_-1 changing from 0.35 to 2.13 and M_-3 changing from 0.005 to 0.4. It was sho

SUBMITTER: Mamand DM 

PROVIDER: S-EPMC11762305 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature