Browsing by Author "Zedek, Rezika"

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    Investigation of structural and optical properties of mixed phase nanoparticles titania synthesized by simple sol gel process
    (University of Oum El Bouaghi, 2021) Zedek, Rezika; Djedjiga, Hatem; Megherbi, Mohamed; Said Belkaid, Mohammed
    The purpose of this study is to calculate the band gap value of mixture phases of TiO2 nanoparticless. The direct and indirect band gap of the samples can be estimated from measurements data of diffuse reflectance spectrascopy. Iron-doped titanium dioxide (TiO2) nanoparticles were prepared via a facile and economical sol gel procedure. The prepared samples were characterized using X-ray diffraction (XRD) and UV-Vis diffuse reflectance spectroscopy. The obtained results by DRX displayed that samples annealed at 550 oC for 3h crystallized into mixture phases. The optical properties were investigated by UV-vis diffuse reflectance spectra (DRS). Using the DRS data, direct and indirect bandgap of the samples was determined by applying the Kubelka–Munk (K-M) equation. Graphics representations were used to calculate Eg: F(R) versus hv, F(R) versus λ, (F(R) hν)^n versus hv with n = ½ for an indirect allowed transition and n = 2 for a direct allowed transition). Moreover the UV-Vis light-diffuse reflectance spectroscopy analysis depicted that the absorption region of Fe-doped TiO2 was shifted to the visible-light range, which was attributed to incorporation of iron into the TiO2 lattice during chemical reaction.