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Structural and Optical Dispersion Characterisation of Sprayed Nickel Oxide Thin Films

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DOI: 10.4236/jmp.2011.210147    6,306 Downloads   13,262 Views   Citations


Crystalline and non-crystalline nickel oxide (NiO) thin films were obtained by spray pyrolysis technique (SPT) using nickel acetate tetrahydrate solutions onto glass substrates at different temperatures from 225 to 350℃. Structure of the as-deposited NiO thin films have been examined by X-ray diffraction (XRD) and atomic force microscope (AFM). The results showed that an amorphous structure of the films at low substrate temperature (Ts = 225℃), while at higher Ts ≥ 275℃, a cubic single phase structure of NiO film is formed. The refractive index (n) and the extinction coefficient (k) have been calculated from the corrected transmittance and reflectance measurements over the spectral range from 250 to 2400 nm. Some of the optical absorption parameters, such as optical dispersion energies, Eo and Ed, dielectric constant, ε, the average values of oscillator strength, So, wavelength of single oscillator λo and plasma frequency, ωp, have been evaluated.

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S. Mahmoud, A. Shereen and M. Tarawnh, "Structural and Optical Dispersion Characterisation of Sprayed Nickel Oxide Thin Films," Journal of Modern Physics, Vol. 2 No. 10, 2011, pp. 1178-1186. doi: 10.4236/jmp.2011.210147.


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