Abstract

CaF₂ Nanoparticles (NPs) were synthesized with a co-precipitation method and used in the preparation series (Polyvinyl Alcohol (PVA)/ CaF₂ nanocomposite films) with different amounts of CaF₂ NPs. The synthesized NPs and nanocomposite films were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), UV-Vis spectroscopy and Photoluminescence (PL) techniques. The XRD results indicate the formation of CaF₂ NPs with THE Cubic phase and the crystalline size is estimated using Scherrer’s to be in the range 20–27 nm. SEM images of nanocomposite films show CaF₂NPs were uniformly distributed on the PVA film surface. The optical absorption spectrum shows a strong absorption edge at about 300 nm. The NPs PL spectrum shows a series of emission peaks at ∼394 and 790 nm, and the PL band of PVA/ CaF₂ films attribute ton←π^∗ electronic transition in non-bonding 2p²(O) electrons in free OH groups in three (syndiotactic, atactic, and isotactic) conformers of PVA polymer molecules.