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    Amplified spontaneous emission in action: Sub-ppm optical detection of acid vapors in poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] thin films

    Year: 2018

    Journal: Sens. Actuator B-Chem., Volume 255, FEB, page 1354–1361

    Authors: Guillen, M. G.; Gamez, F.; Lopes-Costa, T.; Castro-Smirnov, J. R.; Wannemacher, R.; Cabanillas-Gonzalez, J.; Pedrosa, J. M.

    Organizations: Ministry of Economy, Industry and Competitivity of Spain (MINECO) [MAT2014-57652-C2-R, PCIN-2015-169-C02, M-Era-NET/0005/2014]; Operative Programme FEDER Andalucia [P12 FQM-2310]; European Union structural funds; Comunidad de Madrid MAD2DCM Program [S2013/MIT-3007]

    Keywords: Chemical sensors; Conjugated polymer; Fluorescence; Amplified spontaneous emission; Fluorescence quenching

    We present here a highly sensitive optical device for sensing of acid vapors based on the specific properties of thin films of a light emitting conjugated polymer. In these films, the emission quenching of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] in acid environments can be monitorized by the changes in the fluorescence spectra. Both fluorescence and amplified spontaneous emission (ASE) have been used as transduction signals. Working with fluorescence, the sensor shows relatively fast response and good repeatability after consecutive exposure-recovery cycles to formic acid vapors that was selected as a model analyte. Also, the response is concentration-dependent in the 06000 ppm range with adequate fitting to standard models. When the ASE signal is used, a strong quenching is observed for very low acid concentrations, reaching a limit of detection in the sub-ppm range (40 ppb) which is to the best of our knowledge the lowest value found in the literature for formic acid detection by optical sensors. (C) 2017 Elsevier B. V. All rights reserved.
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