Abstract:The changes in molecular chemical structure of polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP), caused by doping PVA-PVP blend with cadmium chloride (CdCl 2 ), have been studied using UV-Visible (UV-Vis) spectroscopy, Fourier Transform Raman spectroscopy and Fourier Transform Infrared (FTIR) spectroscopy. The formation of cadmium nano-structures and microstructures in CdCl 2 doped PVA-PVP blend has been visualized using Scanning Electron Microscopy (SEM), in the range of doping levels varying from 0.5 wt% up to 10.2 wt% (doping level in weight percentage). The incorporation of dopant in PVA-PVP blend is confirmed using Energy Dispersive x-ray Spectroscopy (EDS). The optical absorbance (UV-Vis) spectra of PVA-PVP blend films doped with CdCl 2 from 0.5 wt% up to 2.2 wt%, showed a prominent absorption hump with peak at the wavelength 370 nm, in addition to other intermediate energy bands caused by the interactions of CdCl 2 with molecules of PVA and PVP. The photo-luminescence (emission/ fluorescence) spectra show significant quenching of fluorescence in CdCl 2 doped PVA-PVP blend films. Analysis of FTIR and Raman spectra suggest the possible modes of interaction of cadmium ions (Cd 2+ ) and chlorine ions (Cl -) with reactive functional groups (C-N, hydroxyl and carbonyl groups) of polymeric molecules in the blend. A reaction scheme for interaction of CdCl 2 with PVA-PVP blend is proposed, on the basis of spectroscopic studies on these films.

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