CETMIC   05378
CENTRO DE TECNOLOGIA DE RECURSOS MINERALES Y CERAMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Estudio comparativo de capasde TiO2 depositadas por PLD y nebulizacion pirolítica
Autor/es:
L.PONCE CABRERA; M.L.MARTINEZ RICCI; R. PARRA; E.A. VILLEGAA GÓMEZ; F.C.ALVIRA; G. SUAREZ; M.R. TEJERINA
Reunión:
Congreso; XV Encuentro Nacional de Óptica y VI Conferencia Andina y del Caribe en Óptica; 2017
Resumen:
Spray pyrolysis, is a deposition technique whose route works under open atmospheric conditions and is therefore,highly suitable for relatively large surface area coatings. High dense non-porous anatase titania films have beensynthesized by sol-gel technique. Films of nominal porosity find applications as gas sensors and UV sensors hasbeen done by this technique. Films of optimized porosity are imperative for gas sensor applications as the numberof interactions of gas molecules increases with the film´s surface area thereby increasing its response andsensitivity. Films of controlled porosity synthesized by spray pyrolysis technique have been applied for large areadeposition and are ideally suitable for gas sensing applications.Pulsed Laser Deposition (PLD) is a technique, which uses pulses of laser energy to remove material from thesurface of a target. The vaporized material, containing neutrals, ions and electrons is known as a laser-producedplasma plume and expands rapidly away from the target surface (velocities typically ~10 cm s in vacuum). Film 6 -1growth occurs on a substrate upon which some of the plume material condenses. In practice however, the situationis not so simple, since many variables affects the properties of the film, such as laser fluence, background gaspressure and substrate temperature. These variables allow the film properties to be manipulated somewhat, to suitindividual applications. PLD has been applied with multiple experimental variations like, many kind of laser (all theNd:YAG harmonic has been tested as excitation source for PLD), micro, pico, nano and femtosecond laser hasbeen applied. Also laser emmiting single or multiple pulses have been tested as excitation source for PLD.However, one variant of PLD unexplored until those days, or at least we have not found literature regarding this, isthe implementation of PLD without a vacuum chamber. Let said, PLD in air under atmospheric pressure. Thisvariant, has the simplicity of not use vacuum pump nor chamber, which simplify the instrument. One possibledrawback of this approach is regarding the quality of the layers obtained. However, not all the applications need ahigh quality smooth layer.In this work, we report a comparison between TiO coatings obtained by the two previously mentioned inexpensive 2techniques. We analyze for both techniques, porosity (useful to gas sensing), composition (regarding forphotocatalyst) and Crystalline phase throughout well-known Raman spectrum of TiO . We also propose possibly