Synthesis and Characterization of flavonoid doped CA/PVP/TiO2 thin film for UV shielding Application
Bapanapalle Chandra Obulesu, Kajol Taiwade, Vivek Chandel, Jyoti Bamne, Fozia Z. Haque
Maulana Azad National Institute of Technology, Bhopal, Madhya Pradesh, India
Ultra-Violet (UV) radiation is an electromagnetic radiation with a wavelength from 100-400 nm. UV radiation classified into three types, namely UV-C, UV-B and UV-A. UV-C light is shorter wavelength (100-280 nm) than UV-B (280-315 nm) and UV-A (315-400 nm). In this research, we fabricated a nanocomposite thin transparent film of cellulose acetate, PVP and TiO2 nanoparticles doped with Quercetin (flavonoid) for the application of UV shielding. Inorganic TiO2 has good thermal and physical stability, non-hazardous nature to human body and excellent photo activity under UV irradiation. Cellulose acetate is a naturally occurring organic polymer and biodegradable. PVP is a water soluble polymer made from the monomer N-vinylpyrrolidone. It is having unique combination of physical and chemical properties and bio compatibility. Film obtained from PVP has a glassy transparency and clear. Quercetin, belongs to the flavanols group and it protects plants from UV exposure, in nature more than 3500 types of flavonoids are available. TiO2 particles synthesized via sol-gel method and nanocomposite was prepared with CA/PVP/TiO2 and flavonoid doped with various concentrations (0.5, 1, 1.5 and 2) wt%. TiO2 nanoparticles are characterized by XRD, AFM, SEM, UV and PL. Structural properties of CA/PVP/TiO2 and their crystalline size is 8.06 nm calculated by Debye Scherrer’s equation using powder XRD. Optical properties of thin film were characterized by UV-Vis and photoluminescence (PL) spectroscopy. Thin film CA/PVP/TiO2 doped with 2 wt% flavonoid got best UV light absorption around 92.78%.
Keywords: TiO2 nanoparticles, PVP, Quercetin (flavonoid), Cellulose acetate, Transparent thin film, Morphology, Optical property, UV Shielding