Abstract

In this research natural bio polymer “chitosan” was synthesized using fish shells, Chitosan is made from chitin by a chemical process involving demineralization (DA), deproteinization (DP) and deacetylation (DA). Chitosan was doped with (NiCl₂) by using casting method. The effects of addition of nickel chloride concentration optical properties of chitosan have been studied in the wavelength range (200-800) nm. The absorption coefficient, energy gap, refractive index and extinction coefficient have been determined. The results show that the optical constants change with increase of nickel chloride concentration.