Title : Investigation of some physical properties of pure and doped transparent conducting oxides synthesized on glass substrates by chemical method. Application to ZnO, NiO, MoO3
Abstract:
Pure and doped transparent conducting oxides (TCO) as ZnO, NiO, MoO3 nanofilms were synthesized on glass substrates using the spray pyrolysis method. The nanometric pure TCO films were prepared from the 10-2 M.L-1 solution of different powders in distilled water. Sr, Ba and Co-doping at various concentration were used. The structure and the morphology of the films were investigated by means of X-ray diffraction and atomic force microscopy. XRD patterns peaks are corresponding to structure phases of ZnO, NiO and MoO3 . The AFM observations revealed the surface topography and different roughness were determined. Optical properties were investigated through reflectance, transmittance and photoluminescence measurements. The optical band gap, the Urbach energy and the refractive index were deduced from these measurements. The presence of oxygen vacancies was revealed from the interband transitions in the blue and green domains. The photocatalytic degradation of an aqueous solution of methylene blue (MB) under UV irradiation, in the presence of TCO nanomfilms, has been carried out using UV-visible spectroscopy: the intensity of the absorption peak recorded at 660 nm decreased with the increase of the UV-illumination time while the color of the initial MB solution was drastically waned.
Keywords: Spray pyrolysis method, TCO nanofilms; optical properties; magnetic properties; Photocatalytic properties.
Audience Take Away:
• My presentation concerns the effectiveness of chemical growth methods for transparent insulating oxides (TCO). These synthesis techniques are inexpensive compared to physical methods that require heavy and expensive equipment. The results obtained confirm this idea Biography: Ghamnia Mostefa is Professor of Physics at Oran University 1 (Oran, Algeria). He is Director of the Laboratory of Condensed Matter Sciences, which mainly studies nanomaterials (structures and properties).
