Please cite this article as: Mohd. Danish, S. Ambreen, A. Chauhan, A. Pandey, Optimization and comparative evaluation of optical and photocatalytic properties of TiO 2 thin films prepared via sol-gel method, Journal of Saudi Chemical Society (2015), doi: http://dx.
Abstract:TiO 2 thin films were fabricated with optimization of the synthesis parameters for efficient photocatalysis. The films were sculptured from gels obtained from Ti(O i Pr) 4 and Ti(OBu s ) 4 via spin coating at different rotation speed ranging from 1000 rpm to 3000 rpm. Thicknesses of the films were in the range of ≈ 112 nm to ≈ 160 nm. The X-ray diffractograms showed a phase transformation from anatase to rutile along with increase in average crystallite size from 11 nm to 18 nm with decrease in thickness of the films.Refractive index (n) values of the films were in the range of 2.50 to 3.45 while extinction coefficient (k) values ranged from 0.090 to 0.860. These films were transparent with high transmittance (T ≤ 95%) in the visible region. The optical band gaps for films were calculated to be in the range of 3.00 eV to 3.95 eV. Photocatalytic degradations of methylene blue by the fabricated TiO 2 thin films has also been investigated.Introduction:
Ferrites samples Mg1-xLixFe2O4 for x = 0.0, 0.1, 0.2, 0.3, were synthesized by solid-state sintering method. Detailed investigations were made on the structural, morphological, magnetic and electrical proprieties of these samples. A detailed investigation was performed on power generation of these samples and role of Li-doping has been discussed. The X-ray Diffraction (XRD) pattern confirms the spinel phase formation in samples without any impurity. It is observed from Scanning Electron Microscopy that average grain size of samples decreases with lithium doping in MgFe2O4. The saturation magnetization of MgFe2O4 (15.4 emu/g) is found to increase with Lithium percentage and maximum 39.3 emu/g for Mg0.7Li0.3Fe2O4 sample. Ferrites play a crucial role in magnetic recording, microwave magnetic devices and many applications in medical sciences. Recently, it was observed that ferrites can be an alternate source of green energy by inventing hydroelectric cell (HEC). The processes of water adsorption and dissociation on the metal-oxide surface, plays an important role in production of electricity in ferrites. When, water is sprayed on hydroelectric cell the thermodynamic driving force is responsible for the formation of stable metal-oxygen or metal-hydroxyl bonds. The reactivity of ferrite surface towards water is based on the interaction of these ions and the d orbital of the Fe atom. Due to this interaction, water dissociated in H3O+ and OH− ions and migrates toward silver and zinc electrodes respectively. A typical hydroelectric cell of 2 inch diameter produces 17.1 mA of peak current and 949 mV voltage with a maximum output power of 15.85 mW for Li = 0.2 doped MgFe2O4 sample.
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