Absorption, dispersion, and emission characteristics of novel Chitosan blends thin films tuned by UV-Ozone
E. A. Gaml, Hajer Abusnina, N. A. El-Ghamaz
TL;DR
This paper explores how UV light affects the optical properties of chitosan-based thin films, suggesting potential uses in optoelectronic devices.
Contribution
The study introduces novel chitosan blends and demonstrates their tunable optical properties under UV irradiation.
Findings
UV irradiation reduces the energy gap (Eg) of chitosan blends from 5.14 eV to as low as 4 eV.
Fluorescence intensity of the polymeric films decreases after UV exposure.
Chitosan blends show modified linear and nonlinear optical properties suitable for optoelectronic applications.
Abstract
In current study, two novel polymers derived from original Chitosan is synthetized. Polymeric blends from Chitosan and the new polymers are used to fabricate spin coated thin films. The effect of UV irradiation on the optical properties of pristine Chitosan and two novel Chitosan derived polymers blends in form of thin film structure are studied. The optical parameters of the blends thin films such as the refractive index (n), extinction coefficient (k) and dielectric constants are determined by spectrophotometric technique in the spectral range 200–2500 nm. The energy gap values (Eg), dielectric constants at infinity (ε∞), lattice permittivity (εL) and dispersion parameters are calculated. Eg is found to be 5.14 eV for Chitosan film and it is reduced to 4.25 and 4 eV for the two polymeric blends. ε∞ is calculated to be 2.96 for Chitosan film which is reduced to 2.88 upon UV…
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Taxonomy
TopicsPolymer Nanocomposite Synthesis and Irradiation · Nonlinear Optical Materials Studies · Nonlinear Optical Materials Research