Optical Absorption of Polyvinyl Alcohol Films Doped with Nickel Chloride

Abstract:

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Films of pure and doped Polyvinyl alcohol (PVA) with different concentration of Nickel Chloride (NiCl2) were prepared using the casting technique, in order to investigate the effect of NiCl2 additions on the optical properties of PVA host. The dispersion studies of pure PVA film and PVA films doped with NiCl2 were studied using complex refractive index in the wavelength range 190-1100 nm. The absorption spectral analysis showed that the optical energy band is due to the direct and indirect allowed optical transitions. The optical energy band gap Egopt of the films decreases with increasing NiCl2 contents, while the Urbach energy ∆Et called the width of localized states in the optical band gap decreases from 0.7414 to 0.1891 eV. The reductions of optical energy band gap were observed for all samples after annealing at temperatures 70oC for three hours.

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Periodical:

Edited by:

Wu Fan

Pages:

177-182

DOI:

10.4028/www.scientific.net/AMM.110-116.177

Citation:

O. G. Abdullah and D. R. Saber, "Optical Absorption of Polyvinyl Alcohol Films Doped with Nickel Chloride", Applied Mechanics and Materials, Vols. 110-116, pp. 177-182, 2012

Online since:

October 2011

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$35.00

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