Optical and electrical properties of NiCl2 filled PVC films

Polyvinylchloride (PVC) films containing different amounts of NiCl2 have been prepared using a casting method. The UV/VIS (200-800 nm) and IR (200-4000 cm−1) spectra and dc electric conductivity have been investigated. One optical absorption edge was found for pure PVC, while the addition of NiCl2 led to the appearance of a second edge at lower photon energy. The change of the calculated values of the optical energy gaps with increasing NiCl2 content has been interpreted in terms of the structural modifications of the PVC matrix. The spectral analysis indicated that the Ni+2 ions are present in its octahedral symmetrical forms. The infrared analysis revealed that there is a change of the NiCl2 chliation mode beyond 0.25 filling level. The electric conduction was attributed to an intrachain one dimensional interpolaron hopping mechanism. The calculated hopping distance was R0 ≥ five monomer unit lengths. R0 depends linearly on both temperature and filling level.

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