Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/5122
Título: Solid-state sensory properties of Calix-Poly(Phenylene Ethynylene)s toward nitroaromatic explosives
Autor: Costa, Alexandra I.
Pinto, Hugo D.
Ferreira, Luís F. V.
Prata, José Virgílio de Sousa Coelho
Palavras-chave: Calixarenes
Conjugated Polymers
Phenylene Ethynylene
Fluorescence
Solid-State Sensors
Explosives
Fluorescent Conjugated Polymers
Chemical Sensors
TNT Chemosensors
Films
Photoluminescence
Trinitrotoluene
Copolymer
Design
Data: 3-Jan-2012
Editora: Elsevier Science SA
Citação: COSTA, A. I.; [et al] – Solid-state sensory properties of Calix-Poly(Phenylene Ethynylene)s toward nitroaromatic explosives. Sensors and Actuators B-Chemical. ISSN: 0925-4005. Vol. 16, nr. 1 (2012), pp. 702-713
Resumo: This study is primarily focused in establishing the solid-state sensory abilities of several luminescent polymeric calix[4]arene-based materials toward selected nitroaromatic compounds (NACs), creating the foundations for their future application as high performance materials for detection of high explosives. The phenylene ethynylene-type polymers possessing bis-calix[4]arene scaffolds in their core were designed to take advantage of the known recognition abilities of calixarene compounds toward neutral guests, particularly in solid-state, therefore providing enhanced sensitivity and selectivity in the sensing of a given analyte. It was found that all the calix[4]arene-poly(para-phenylene ethynylene)s here reported displayed high sensitivities toward the detection of nitrobenzene, 2,4-dinitrotoluene and 2,4,6-trinitrotoluene (TNT). Particularly effective and significant was the response of the films (25-60 nm of thickness) upon exposure to TNT vapor (10 ppb): over 50% of fluorescence quenching was achieved in only 10 s. In contrast, a model polymer lacking the calixarene units showed only reduced quenching activity for the same set of analytes, clearly highlighting the relevance of the macrocyclics in promoting the signaling of the transduction event. The films exhibited high photostability (less than 0.5% loss of fluorescence intensity up to 15 min of continuous irradiation) and the fluorescence quenching sensitivity could be fully recovered after exposure of the quenched films to saturated vapors of hydrazine (the initial fluorescence intensities were usually recovered within 2-5 min of exposure to hydrazine).
Peer review: yes
URI: http://hdl.handle.net/10400.21/5122
DOI: 10.1016/j.snb.2011.11.017
ISSN: 0925-4005
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos



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