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Anchoring effect on (tetra)carboxyphenyl porphyrin/TiO2 composite films for VOC optical detection

 

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dc.creator Roales, Javier es
dc.creator Pedrosa, José María es
dc.creator Cano, Manuel es
dc.creator Guillén, María G. es
dc.creator Lopes da Costa, Tania Isabel es
dc.creator Castillero Durán, Pedro es
dc.creator Barranco Quero, Ángel es
dc.creator Rodríguez González-Elipe, Agustín es
dc.date.accessioned 2017-12-05T14:56:52Z
dc.date.available 2017-12-05T14:56:52Z
dc.date.issued 2014
dc.identifier.citation Roales, J., Pedrosa, J.M., Cano, M., Guillén, M.G., Lopes da Costa, T., Castillero Durán, P.,...,Rodríguez González Elipe, A. (2014). Anchoring effect on (tetra)carboxyphenyl porphyrin/TiO2 composite films for VOC optical detection. RSC Advances, 4, 1974-1981.
dc.identifier.issn 2046-2069 es
dc.identifier.uri http://hdl.handle.net/11441/67286
dc.description.abstract The optical gas sensing properties of Zn-(ii)-5,10,15,20-tetra(3- carboxyphenyl)porphyrin (m-ZnTCPP) and Zn-(ii)-5,10,15,20-tetra(4-carboxyphenyl) porphyrin (p-ZnTCPP) bound to microcolumnar TiO2 thin films have been compared and explained in terms of their different molecular structure and anchoring to the titania surface. This different binding has been confirmed by specular reflectance FTIR revealing that m-ZnTCPP is bound by its four carboxylic groups in contrast to p-ZnTCPP where two or three of these groups remain unanchored. As a consequence, the Soret band of the para derivative is blue shifted with respect to the solution, indicating H aggregation, while m-ZnTCPP remained in its monomeric form due to the planar anchoring by the four COOH groups to the titania matrix that would avoid porphyrin aggregation. The sensing performance of the two systems has been assessed by analyzing the spectral changes in their UV-visible spectra under exposure to six volatile organic compounds. Although the highly porous and non-dispersive TiO2 matrix allow good sensing ability in both cases, the response of the m-ZnTCPP/TiO2 composite has been found to be more intense and faster than that of p-ZnTCPP. Moreover, the use of identification patterns also indicates that the meta derivative achieves a more selective recognition of the selected analytes. This improvement in the sensing capabilities of m-ZnTCPP has been attributed to the absence of aggregation between adjacent macrocycles es
dc.description.sponsorship Ministerio de Economía y Competitividad TEC2010-21830-C02-01 es
dc.format application/pdf es
dc.language.iso eng es
dc.publisher Royal Society of Chemistry es
dc.relation.ispartof RSC Advances, 4, 1974-1981.
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 Internacional *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/ *
dc.title Anchoring effect on (tetra)carboxyphenyl porphyrin/TiO2 composite films for VOC optical detection es
dc.type info:eu-repo/semantics/article es
dc.type.version info:eu-repo/semantics/publishedVersion es
dc.rights.accessrights info:eu-repo/semantics/openAccess es
dc.contributor.affiliation Universidad de Sevilla. Departamento de Química Inorgánica es
dc.relation.projectID TEC2010-21830-C02-01 es
dc.relation.publisherversion http://dx.doi.org/10.1039/c3ra42443j es
dc.identifier.doi 10.1039/c3ra42443j es
idus.format.extent 8 p. es
dc.journaltitle RSC Advances es
dc.publication.volumen 4 es
dc.publication.initialPage 1974 es
dc.publication.endPage 1981 es
dc.contributor.funder Ministerio de Economía y Competitividad (MINECO). España
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