Cellulose Acetate polymer spectroscopic study comprised LaFeO3 perovskite and graphene as a UV-to-visible light converter used in several applications

A simple and fast method was used to synthesize cellulose acetate (CA), CA/LaFeO3, CA/graphene (G) and CA/LaFeO3/G nanocomposite films. X-ray diffraction (XRD) illustrates that all films have a broad peak at 2 theta = 22.63 degrees corresponding to the amorphous CA polymer. The Raman spectra of nanocomposite films show a strong band at 3075 cm(-1) characteristics of asymmetric CH2 vibrations of CA and its intensity decreased in the case of G nanofiller due to the reaction between the CA polymer and nanoparticles. Field emission scanning electron microscope (FESEM) shows the porous nature of the smooth surface morphology of CA film with an average diameter of 2.23 mu m. The addition of LaFeO3 and G to CA film has good distribution. The UV spectra of the prepared films revealed a broad absorption band ranging from 208 to 300 nm, corresponding to the carbonyl group in the CA polymer. The optical properties of the films show a direct transition with an optical band gap ranging from 3.9 to 4.2 eV. All the investigated samples converted harmful UV radiation into red light, but the CA/G film sample had the highest conversion efficiency, making it useful in a variety of applications. (c) 2023 Elsevier B.V. All rights reserved.

Automated summary

A simple and fast method was used to synthesize cellulose acetate (CA), CA/LaFeO3, CA/graphene (G) and CA/LaFeO3/G nanocomposite films. XRD analysis showed that all films were amorphous CA polymer. Raman spectra revealed the reaction between CA polymer and G nanofiller, leading to decreased intensity. FESEM images displayed the porous nature and smooth surface morphology of CA film. UV spectra and optical properties indicated the potential applications of the films in converting harmful UV radiation into red light, with CA/G film having the highest conversion efficiency.