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Materials 2017, 10(2), 124; doi:10.3390/ma10020124

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

1
Departmento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, Sevilla 41013, Spain
2
REQUIMTE-LAQV, UCIBIO Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, R. Campo Alegre, Porto 4169-007, Portugal
3
Instituto de Ciencia de Materiales de Sevilla, Universidad de Sevilla-CSIC, Américo Vespucio 49, Sevilla 41092, Spain
*
Author to whom correspondence should be addressed.
Received: 7 December 2016 / Accepted: 23 January 2017 / Published: 31 January 2017
(This article belongs to the Special Issue Porous Films)
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Abstract

The 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. View Full-Text
Keywords: rosamine dyes; porous columnar semiconductors; gas sensors rosamine dyes; porous columnar semiconductors; gas sensors
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MDPI and ACS Style

Guillén, M.G.; Gámez, F.; Suárez, B.; Queirós, C.; Silva, A.M.G.; Barranco, Á.; Sánchez-Valencia, J.R.; Pedrosa, J.M.; Lopes-Costa, T. Preparation and Optimization of Fluorescent Thin Films of Rosamine-SiO2/TiO2 Composites for NO2 Sensing. Materials 2017, 10, 124.

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