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Title

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

AuthorsGuillén, María G.; Gámez, Francisco ; Suárez, Belén; Queirós, Carla; Silva, Ana María G.; Barranco, Ángel ; Sánchez-Valencia, J. R. ; Pedrosa, José María; Lopes-Cota, Tánia
KeywordsRosamine dyes
Porous columnar semiconductors
Gas sensors
Issue Date2017
PublisherMultidisciplinary Digital Publishing Institute
CitationMaterials 10 (2): 124 (2017)
AbstractThe incorporation of a prototypical rosamine fluorescent dye from organic solutions into transparent and microstructured columnar TiO2 and SiO2 (MO2) 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 pseudosecond order kinetic model, respectively. The anchoring mechanism of the rosamine to the MO2 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 NO2 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
Publisher version (URL)http://dx.doi.org/10.3390/ma10020124
URIhttp://hdl.handle.net/10261/146594
DOI10.3390/ma10020124
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