Nanocomposites of PVA/chitosan blend with BiOCl:Eu3+ prepared by sonochemical route: Forensic and optoelectronics applications

Polymers of chitosan (CS) and polyvinyl alcohol (PVA) were combined effectively to create a synergetic property of both. To this composite, BiOCl:Eu3+ nanoparticles (NPs) were used as an appropriate filler. Vitamin B2 (VB2) was used as a biosafe coupling agent to modify the surface of NPs. Different weight percentage of BCE (50, 100, and 150 wt%) were then created using a casting/solvent evaporation process after being exposed to ultrasonic irradiations. The compatibility of NPs with the blend polymer were enhanced due to the coupling agent. Optical absorbance and thermal stability of compounds were impacted by inserting the modified NPs into the blend polymer. The hydrophilicity reduced for various ratios of the modified NPs loaded in the blend polymer, according to the contact angle measurements. The characteristic emission peaks of Eu3+ ions were observed at 581, 594, 621, 652, and 698 nm after being stimulated by 466 nm. With increased surface modifier concentration, the chromaticity diagram showed that emission colors altered from red to deep red. Reduced space charge polarization of the dipoles was shown to be the cause of the dielectric constant decreasing with frequency. The various resistive and capacitive elements of the produced materials are credited with the non-Debye type relaxation process. The level I-III ridge details are visible in the colorimetric images of fingerprints using the optimized nanofiller in polymer matrix on forensic-related surfaces. The aforementioned results made it abundantly evident that the improved NCs are very beneficial in multidimensional applications. [Display omitted] •Surface modification of CuO nanoparticles by using thiamine as a bio-safe modifier.•PVA-PVP/CuO-VB1 NCs showed increased antibacterial activity.•Hydrophobicity of PVA-PVP/CuO-VB1 NC films was also improved.•EDA proved the presence of BSA in the modified NPs as well as in the obtained NCs.