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The Influence of the Precursor Type and of the Substrate on the SPD Deposited TiO2 Photocatalytic Thin Films


Photocatalytic degradation of organic pollutants from wastewater using titanium dioxide is recognized as an efficient process. To be feasible, this process needs to be solar- or visible light -activated, but, due to its wide band gap energy, titanium dioxide can only be activated by ultraviolet radiation. In this paper, thin films of titanium dioxide were deposited by Spray Pyrolysis Deposition using organo-metallic (titanium-iso-propoxide) and inorganic (titanium chloride) precursors, as a first step in optimizing the deposition process of titanium dioxide - carbon composite thin films, active in the visible spectral range. The thin films were characterized to outline the differences when using these two precursor solutions, when deposited on Fluorine doped Tin Oxide-glass, regular glass and microscopic glass, in terms of crystallinity (by using X-ray diffraction), elemental composition (using Energy Dispersive X-ray spectrometry), surface morphology (Scanning Electronic Microscopy and Atomic Force Microscopy). The photocatalytic activity of the titanium dioxide thin films was investigated based on the removal efficiencies of methylene blue from a synthetically prepared wastewater. The samples deposited using the inorganic precursor show higher roughness, and this proves to be the most important factor that influences the phocatalytic processes. After 8 hours of ultraviolet irradiation, methylene blue removal efficiencies up to 36% were observed; the highest removal efficiency was registered using the thin titanium dioxide film obtained using the titanium chloride precursor, deposited on fluorine doped tin oxide glass substrate, due to the titanium dioxide-tin dioxide semiconductor tandem formed at the interface, that limits the electron-hole recombination, thus increasing the photoctalytic performance of the substrate.

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Optical Modeling and Simulation of Tandem Metal Oxide Solar Cells

) (to be published) [11] ATLAS User’s Manual – Device Simulation Software, Silvaco, Santa Clara, USA, (2016) [12] Ø. Nordseth, I. Chilibon, B. G. Svensson, R. Kumar, S. E. Foss, C. Vasiliu, R. Iordanescu, L. Baschir, D. Savastru, L. Fara, R. Ghita. Characterization of copper oxide photosensitive thin films, Proceedings of the ROCAM 2017 Conference, 11-14 July 2017, Bucharest (2017) 86 [13] S. C. Baker-Finch, K. R. McIntosh. OPAL 2: Rapid Optical Simulation of Silicon Solar Cells. Proceedings of the 38th IEEE Photovoltaic Specialists Conference

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Effectiveness of GEANT4 in Monte Carlo Simulation Studyofphonon Conduction in Sn Host with Si Nanowire Interface

Associated Equipment, Physics Research, 3(2003) 250-303 [9] S. Mazumder, A. Majumdar, Monte Carlo Study of Phonon Transport in Solid Thin Films Including Dispersion and Polarization, Journal of Heat Transfer, 123(2001) 749-759 [10] S. Succi, The Lattice-Boltzmann Equation for Fluid Dynamics and Beyond, Clarendon Press, Oxford, UK (2001)

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Fractal Analysis on Morphology of Laser Irradiated Vanadium Surfaces Under Different Ambient

References [1] Hu, J., Odom, T. W., Lieber, C. M., Acc. Chem. Res. 32 (1999) 435-445. [2] Odom, T. W.; Huang, J.-L.; Kim, P.; Lieber, C. M. J. Phys. Chem. B, 104 (2000) 2794-2809 [3] Beth S. Guiton, Qian Gu, Amy L. Prieto, Mark S. Gudiksen, and Hongkun Park Single- Crystalline Vanadium Dioxide Nanowires with Rectangular Cross Sections, J. Am. Chem. Soc. 9, 127( 2005) [4] S. Beke, L. Kőrösi, S. Papp, A. Oszkó, L. Nánai: XRD and XPS analysis of laser treated vanadium oxide thin films. Applied

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