2024-03-29T13:14:38Zhttp://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/409592021-06-24T07:46:51Zcom_10324_31661com_10324_952com_10324_894com_10324_1186com_10324_931col_10324_31662col_10324_1404
Polymeric foams as the matrix of voltammetric sensors for the detection of catechol, hydroquinone, and their mixtures
Fernández Blanco, C.
Múgica Izaguirre, Mikel
Rodríguez Pérez, Miguel Ángel
García Cabezón, Ana Cristina
Rodríguez Méndez, María Luz
Producción Científica
Porous electrodes based on polymethylmethacrylate and graphite foams (PMMA_G_F) have been developed and characterized. Such devices have been successfully used as voltammetric sensors to analyze catechol, hydroquinone, and their mixtures. The presence of pores induces important changes in the oxidation/reduction mechanism of catechol and hydroquinone with respect to the sensing properties observed in nonfoamed PMMA_graphite electrodes (PMMA_G). The electropolymerization processes of catechol or hydroquinone at the electrode surface observed using PMMA_G do not occur at the surface of the foamed PMM_G_F. In addition, the limits of detection observed in foamed electrodes are one order of magnitude lower than the observed in the nonfoamed electrodes. Moreover, foamed electrodes can be used to detect simultaneously both isomers and a remarkable increase in the electrocatalytic properties shown by the foamed samples, produces a decrease in the oxidation potential peak of catechol in presence of hydroquinone, from +0.7 V to +0.3 V. Peak currents increased linearly with concentration of catechol in presence of hydroquinone over the range of 0.37·10−3 M to 1.69·10−3 M with a limit of detection (LOD) of 0.27 mM. These effects demonstrate the advantages obtained by increasing the active surface by means of porous structures.
2020-05-29
2020-05-29
2018
info:eu-repo/semantics/article
Journal of Sensors, 2018, vol. 2018. 9 p.
1687-725X
http://uvadoc.uva.es/handle/10324/40959
10.1155/2018/2714752
eng
https://www.hindawi.com/journals/js/2018/2714752/
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2018 Hindawi
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Hindawi