RT info:eu-repo/semantics/article
T1 Paper-Based Probes with Visual Response to Vapors from Nitroaromatic Explosives: Polyfluorenes and Tertiary Amines
A1 Aguado, Roberto
A1 Santos, A. Rita M. G.
A1 Vallejos Calzada, Saúl
A1 Valente, Artur J. M.
K1 Cellulose
K1 Explosive detection
K1 Meisenheimer complex
K1 Nitroaromatics
K1 Paper analytical devices
K1 Polyfluorenes
K1 Química orgánica
K1 Chemistry, Organic
AB Although it is well-known that nitroaromatic compounds quench the fluorescence ofdifferent 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 workundertakes this task, impregnating paper strips with a fluorene-phenylene copolymer with quaternaryammonium groups, a bisfluorene-based cationic polyelectrolyte, and poly(2-(dimethylamino)ethylmethacrylate) (polyDMAEMA). Cationic groups make the aforementioned polyfluorenes attachableto paper, whose surface possesses a slightly negative charge and avoid interference from cationicquenchers. While conjugated polymers had their fluorescence quenched with nitroaromatic vaporsin a non-selective way, polyDMAEMA-coated papers had a visual response that was selective to2,4,6-trinitrotoluene (TNT), and that could be easily identified, and even quantified, under naturallight. Far from implying that polyfluorenes should be ruled out, it must be taken into account thatTNT-filled mines emit vapors from 2,4-dinitrotoluene (DNT) and dinitrobenzene isomers, whichare more volatile than TNT itself. Atmospheres with only 790 ppbv TNT or 277 ppbv DNT wereenough to trigger a distinguishable response, although the requirement for certain exposure times isan important limitation.
PB MDPI
YR 2022
FD 2022-05
LK http://hdl.handle.net/10259/7604
UL http://hdl.handle.net/10259/7604
LA eng
NO This 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.
DS Repositorio Institucional de la Universidad de Burgos
RD 19-abr-2024