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dc.contributor.authorAguado, Roberto
dc.contributor.authorSantos, A. Rita M. G.
dc.contributor.authorVallejos Calzada, Saúl 
dc.contributor.authorValente, Artur J. M.
dc.date.accessioned2023-03-28T08:09:51Z
dc.date.available2023-03-28T08:09:51Z
dc.date.issued2022-05
dc.identifier.urihttp://hdl.handle.net/10259/7604
dc.description.abstractAlthough it is well-known that nitroaromatic compounds quench the fluorescence of different conjugated polymers and form colored Meisenheimer complexes with proper nucleophiles, the potential of paper as a substrate for those macromolecules can be further developed. This work undertakes this task, impregnating paper strips with a fluorene-phenylene copolymer with quaternary ammonium groups, a bisfluorene-based cationic polyelectrolyte, and poly(2-(dimethylamino)ethyl methacrylate) (polyDMAEMA). Cationic groups make the aforementioned polyfluorenes attachable to paper, whose surface possesses a slightly negative charge and avoid interference from cationic quenchers. While conjugated polymers had their fluorescence quenched with nitroaromatic vapors in a non-selective way, polyDMAEMA-coated papers had a visual response that was selective to 2,4,6-trinitrotoluene (TNT), and that could be easily identified, and even quantified, under natural light. Far from implying that polyfluorenes should be ruled out, it must be taken into account that TNT-filled mines emit vapors from 2,4-dinitrotoluene (DNT) and dinitrobenzene isomers, which are more volatile than TNT itself. Atmospheres with only 790 ppbv TNT or 277 ppbv DNT were enough to trigger a distinguishable response, although the requirement for certain exposure times is an important limitation.en
dc.description.sponsorshipThis work was carried out under the Project inpactus—innovative products and technologies from eucalyptus, Project No. 21874 funded by Portugal 2020 through European Regional Development Fund (ERDF) in the frame of COMPETE 2020 No. 246/AXIS II/2017. Finantial support from the Coimbra Chemistry Centre (CQC), which is supported by the Fundação para a Ciência e a Tecnologia (FCT) through the programs UID/QUI/00313/2020 and COMPETE is gratefully acknowledged.en
dc.format.mimetypeapplication/pdf
dc.language.isoenges
dc.publisherMDPIen
dc.relation.ispartofMolecules. 2022, V. 27, n. 9, 2900en
dc.rightsAtribución 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectCelluloseen
dc.subjectExplosive detectionen
dc.subjectMeisenheimer complexen
dc.subjectNitroaromaticsen
dc.subjectPaper analytical devicesen
dc.subjectPolyfluorenesen
dc.subject.otherQuímica orgánicaes
dc.subject.otherChemistry, Organicen
dc.titlePaper-Based Probes with Visual Response to Vapors from Nitroaromatic Explosives: Polyfluorenes and Tertiary Aminesen
dc.typeinfo:eu-repo/semantics/articlees
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.relation.publisherversionhttps://doi.org/10.3390/molecules27092900es
dc.identifier.doi10.3390/molecules27092900
dc.relation.projectIDinfo:eu-repo/grantAgreement/Portugal 2020//POCI-01-0247-FEDER-021874//Produtos e Tecnologias Inovadores a partir do Eucalipto/InPaCTus/pt
dc.relation.projectIDinfo:eu-repo/grantAgreement/FCT//UID%2FQUI%2F00313%2F2020/PT/pt
dc.identifier.essn1420-3049
dc.journal.titleMoleculesen
dc.volume.number27es
dc.issue.number9es
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersiones


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