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STRUCTURAL AND OPTICAL CHARACTERIZATION OF BARIUM SULPHIDE THIN FILMS GROWN BY SOLUTION GROWTH TECHNIQUE
M. N. Nnabuchi
Department of Industrial Physics, Ebonyi State University, Abakaliki, Nigeria
Three thin films of barium sulphide were deposited on glass slides using solution growth technique. The bath compositions include barium chloride (BaCl2) which was the source of Ba2+, sodium thiosulphate (Na2 S2O3.5H2O), source of S2- and EDTA served as a complexing agent. The structural compositions of these films were examined using the microscope (HUND WETZLAR H600) and camera (RICOH 35mm SLR, XR-X300) at magnification of x400. Fourier transform infrared (FTIR) spectroscopy and spectrophotometer were used to determine the optical properties like absorbance, transmittance, reflectance, refractive index, extinction coefficient and optical conductivity. The results of characterization show that these films have poor absorbance and reflectance. The transmittance range of the films from UV-NIR is 60-90%. The range of the refractive index is 1.3-1.6; extinction coefficient has range of 0.001-0.012 while optical conductivity has a range of 1.0 x1012 s-1 - 2.5 x1012 s-1.
Keywords: Barium sulphide, Fourier transform infrared (FTIR) spectroscopy, optical properties, thin films, solution growth technique.