Electrochemical Sensors Based on Screen-Printed Electrodes: The Use of Phthalocyanine Derivatives for Application in VFA Detection.
Here, we report on the use of electrochemical methods for the detection of volatiles fatty acids (VFAs), namely acetic acid. We used tetra-tert-butyl phthalocyanine (PcH₂-tBu) as the sensing material and investigated its electroanalytical properties by means of cyclic voltammetry (CV) and square wave voltammetry (SWV). To realize the electrochemical sensing system, the PcH₂-tBu has been dropcast-deposited on carbon (C) orgold (Au)screen-printed electrodes (SPEs) and characterized by cyclic voltammetry and scanning electron microscopy (SEM). The SEM analysis reveals that the PcH₂-tBu forms mainly aggregates on the SPEs. The modified electrodes are used for the detection of acetic acid and present a linear current increase when the acetic acid concentration increases. The Cmodified electrode presents a limit of detection (LOD) of 25.77 mM in the range of 100 mM-400 mM, while the Aumodified electrode presents an LOD averaging 40.89 mM in the range of 50 mM-300 mM. When the experiment is realized in a buffered condition, theCmodified electrode presents a lower LOD, which averagesthe 7.76 mM. A pronounced signal decay attributed to an electrode alteration is observed in the case of the gold electrode. This electrode alteration severely affects the coating stability. This alteration is less perceptible in the case of the carbon electrode.
Clermont Université, Université Blaise Pascal, Institut Pascal, BP 10448, F-63000 Clermont-Ferrand, France. amalat2005@yahoo.fr.|CNRS, UMR 6602, Institut Pascal, Campus Universitaire des Cézeaux, 4 Avenue Blaise Pascal, 63178 Aubiere Cedex, France. amalat2005@yahoo.fr.
Amadou L
AL
Ndiaye
Clermont Université, Université Blaise Pascal, Institut Pascal, BP 10448, F-63000 Clermont-Ferrand, France. sebastiendelile@gmail.com.|CNRS, UMR 6602, Institut Pascal, Campus Universitaire des Cézeaux, 4 Avenue Blaise Pascal, 63178 Aubiere Cedex, France. sebastiendelile@gmail.com.
Sébastien
S
Delile
Clermont Université, Université Blaise Pascal, Institut Pascal, BP 10448, F-63000 Clermont-Ferrand, France. brunet@lasmea.univ-bpclermont.fr.|CNRS, UMR 6602, Institut Pascal, Campus Universitaire des Cézeaux, 4 Avenue Blaise Pascal, 63178 Aubiere Cedex, France. brunet@lasmea.univ-bpclermont.fr.
Jérôme
J
Brunet
Clermont Université, Université Blaise Pascal, Institut Pascal, BP 10448, F-63000 Clermont-Ferrand, France. christelle.VARENNE@lasmea.univ-bpclermont.fr.|CNRS, UMR 6602, Institut Pascal, Campus Universitaire des Cézeaux, 4 Avenue Blaise Pascal, 63178 Aubiere Cedex, France. christelle.VARENNE@lasmea.univ-bpclermont.fr.
Christelle
C
Varenne
Clermont Université, Université Blaise Pascal, Institut Pascal, BP 10448, F-63000 Clermont-Ferrand, France. Alain.PAULY@lasmea.univ-bpclermont.fr.|CNRS, UMR 6602, Institut Pascal, Campus Universitaire des Cézeaux, 4 Avenue Blaise Pascal, 63178 Aubiere Cedex, France. Alain.PAULY@lasmea.univ-bpclermont.fr.
Alain
A
Pauly
D019342:Acetic Acid / Q000032:analysis; D015374:Biosensing Techniques; D055664:Electrochemical Techniques; D004566:Electrodes; D007211:Indoles / Q000032:analysis; D054833:Isoindoles; D057230:Limit of Detection
D007211:Indoles; D054833:Isoindoles; D019342:Acetic Acid; C013647:phthalocyanine
CV; SWV; acetic acid; dropcast-deposition; metal-free phthalocyanine