Preparation and Characterization of (PVA+ZnO) Polymer Films Doped With Cu2+ Ions

Abstract

5 mol% (PVA+ZnO): (x mol%) Cu ions doped polymer films were prepared by solution casting technique. The obtained films are analyzed using different characterization techniques like SEM, FTIR, optical and EPR. The SEM micrographs shows the improvement in the crystallinity of the Cu 2+ doped PVAZn polymer films compared with the pure PVAZn film. The Fourier transform infrared spectroscopy (FTIR) spectrum shows a characteristic peaks of C-H, C=C, CH2 and C-O bonds. The optical absorption spectrum exhibits broad bands at 412 nm and 692 nm, which were corresponds to the 2 B1g → 2 Eg and 2 B1g → 2 B2g transition. The EPR spectra of all the polymer samples exhibits resonance signals characteristic of Cu 2+ ions. The spin-Hamiltonian parameter indicate that the ground state of Cu 2+ ions is dx 2 y 2 and the site symmetry around Cu 2+ ions is tetragonally distorted octahedral site. The number of spins participating in resonance (N) and paramagnetic susceptibility () were calculated from the EPR data for various concentrations of Cu ions.