Artículo
Optical gas sensing of ammonia and amines based on protonated porphyrin/TiO2 composite thin films
Autor/es | Castillero Durán, Pedro
Roales, Javier Lopes da Costa, Tania Isabel Sánchez Valencia, Juan Ramón Barranco Quero, Ángel Rodríguez González-Elipe, Agustín Pedrosa, José María |
Departamento | Universidad de Sevilla. Departamento de Química Inorgánica |
Fecha de publicación | 2017 |
Fecha de depósito | 2017-05-17 |
Publicado en |
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Resumen | Open porous and transparent microcolumnar structures of TiO2 prepared by physical
vapour deposition in glancing angle configuration (GLAD-PVD) have been used as host
matrices for two different fluorescent cationic ... Open porous and transparent microcolumnar structures of TiO2 prepared by physical vapour deposition in glancing angle configuration (GLAD-PVD) have been used as host matrices for two different fluorescent cationic porphyrins, 5-(N-methyl 4-pyridyl)-10,15,20-triphenyl porphine chloride (MMPyP) and meso-tetra (N-methyl 4-pyridyl) porphine tetrachloride (TMPyP). The porphyrins have been anchored by electrostatic interactions to the microcolumns by self-assembly through the dip-coating method. These porphyrin/TiO2 composites have been used as gas sensors for ammonia and amines through previous protonation of the porphyrin with HCl followed by subsequent exposure to the basic analyte. UV–vis absorption, emission, and time-resolved spectroscopies have been used to confirm the protonation–deprotonation of the two porphyrins and to follow their spectral changes in the presence of the analytes. The monocationic porphyrin has been found to be more sensible (up to 10 times) than its tetracationic counterpart. This result has been attributed to the different anchoring arrangements of the two porphyrins to the TiO2 surface and their different states of aggregation within the film. Finally, there was an observed decrease of the emission fluorescence intensity in consecutive cycles of exposure and recovery due to the formation of ammonium chloride inside the film. |
Identificador del proyecto | FQM-2310
info:eu-repo/grantAgreement/MINECO/MAT2013-42900-P info:eu-repo/grantAgreement/MINECO/MAT2014-57652-C2-2-R info:eu-repo/grantAgreement/MINECO/MAT2015-69035-REDC MINECO-CSIC info:eu-repo/grantAgreement/MINECO/201560E055 info:eu-repo/grantAgreement/MINECO/PCIN-2015-169-C02-02 |
Cita | Castillero, P., Roales, J., Lopes-Costa, T., Sánchez Valencia, J.R., Barranco Quero, Á., Rodríguez González-Elipe, A. y Pedrosa, J.M. (2017). Optical gas sensing of ammonia and amines based on protonated porphyrin/TiO2 composite thin films. Sensors, 17 (1), 1-14. |
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