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Título : Easy and inexpensive method for the visual and electronic detection of oxidants in air by using vinylic films with embedded aniline
Autor : Pascual Portal, Blanca Sol
Vallejos Calzada, Saúl
Reglero Ruiz, José A.
Bertolín Burillo, Juan Carlos
Represa Pérez, César
García García, Félix Clemente
García Pérez, José Miguel
Publicado en: Journal of Hazardous Materials. 2019, V. 364, p. 238-243
Editorial : Elsevier
Fecha de publicación : feb-2019
Fecha de disponibilidad: 15-feb-2021
ISSN : 0304-3894
DOI: 10.1016/j.jhazmat.2018.10.039
Resumen : Conventional nonconductive vinylic films with dispersed aniline change their color and become conductive in the presence of specific oxidant gases, namely, chlorine and hydrogen peroxide. The color change arises from the polymerization of the aniline to yield the conjugated polymer polyaniline, which at the same time renders the flexible vinylic films conductive. We present a simple and straightforward method using both colorimetric and electrical responses to detect and quantify the presence of oxidants (Cl2 and H2O2) in the air. Using RGB analysis (red, green and blue parameters defining the colors in digital pictures on a computer display) based on different pictures taken with a smartphone of discs extracted from the films and by measuring the UV–vis spectral variation in the presence of different concentrations of Cl2 and H2O2, we obtained limits of detection and quantification between 15 and 200 ppbv for H2O2 and between 37 and 583 ppbv for Cl2. Additionally, the electrical response was measured using a fabricated device to visually detect the electrical conductivity activation of the sensor in the presence of oxidant atmospheres, detecting a rapid decrease in resistivity (three orders of magnitude) when the polymerization of aniline began, changing the film from non-conductive to conductive.
Palabras clave: Vinylic films
Detection of oxidant atmospheres
Visual detection
Resistivity sensors
Conductive polymers
Materia: Química orgánica
Chemistry, Organic
Licencia: https://creativecommons.org/licenses/by-nc-nd/4.0/
URI : http://hdl.handle.net/10259/4998
Versión del editor: https://doi.org/10.1016/j.jhazmat.2018.10.039
Aparece en las colecciones: Artículos POLYMERS

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