Preparation and Optimization of Fluorescent Thin Films of Rosamine-SiO₂/TiO₂ Composites for NO₂ Sensing

Author： Guillén María G. Gámez Francisco Suárez Belén Queirós Carla Silva Ana M. G. Barranco Ángel Sánchez-Valencia Juan Ramón Pedrosa José María Lopes-Costa Tânia

Publisher： MDPI

E-ISSN： 1996-1944|10|2|124-124

ISSN： 1996-1944

Source： Materials, Vol.10, Iss.2, 2017-01, pp. : 124-124

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Abstract

The incorporation of a prototypical rosamine fluorescent dye from organic solutions into transparent and microstructured columnar TiO 2 and SiO 2 (MO 2 ) thin films, prepared by evaporation at glancing angles (GAPVD), was evaluated. The aggregation of the adsorbed molecules, the infiltration efficiency and the adsorption kinetics were studied by means of UV-Vis absorption and fluorescence spectroscopies. Specifically, the infiltration equilibrium as well as the kinetic of adsorption of the emitting dye has been described by a Langmuir type adsorption isotherm and a p s e u d o second order kinetic model, respectively. The anchoring mechanism of the rosamine to the MO 2 matrix has been revealed by specular reflectance Fourier transform infrared spectroscopy and infiltration from aqueous solutions at different pH values. Finally, the sensing performance towards NO 2 gas of optimized films has been assessed by following the changes of its fluorescence intensity revealing that the so-selected device exhibited improved sensing response compared to similar hybrid films reported in the literature.