2026-04-29T10:14:42Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/49982021-11-10T09:38:19Zcom_10259_5377com_10259_5086com_10259_2604com_10259_4313col_10259_5378col_10259_4314

00925njm 22002777a 4500 dc Pascual Portal, Blanca Sol author Vallejos Calzada, Saúl author Reglero Ruiz, José A. author Bertolín Burillo, Juan Carlos author Represa Pérez, César author García García, Félix Clemente author García Pérez, José Miguel author 2019-02 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. 0304-3894 http://hdl.handle.net/10259/4998 10.1016/j.jhazmat.2018.10.039 Vinylic films Detection of oxidant atmospheres Visual detection Resistivity sensors Conductive polymers Easy and inexpensive method for the visual and electronic detection of oxidants in air by using vinylic films with embedded aniline