Preparation and characterisation of Co(II) ion-doped poly vinyl alcohol-assisted ZnSe nano particles

Co(II) ion-doped poly vinyl alcohol (PVA)-capped zinc selenide (ZnSe) nanoparticles are prepared at room temperature by a conventional chemical method. The prepared sample is characterised by X-ray diffraction; optical, FT-IR studies and different physical parameters are evaluated using the measured values of refractive index and density. From the X-ray diffraction pattern, the average crystallite size is calculated using Scherrer's formula and it is about 9.6 nm. The optical absorption spectrum revealed that the site symmetry of the Co(II) is octahedral. Crystal field (Dq ) and inter-electronic repulsion parameters (B and C) are evaluated. The FT-IR spectrum of PVA-capped Co(II)-doped ZnSe indicates the presence of O–H, C–H, C=C and C=O groups of stretching and bending vibrations.