RT info:eu-repo/semantics/article
T1 Electrochemical behavior of polypyrrol/AuNP composites deposited by different electrochemical methods: sensing properties towards catechol
A1 García Hernández, Celia
A1 García Cabezón, Ana Cristina
A1 Medina Plaza, Cristina
A1 Martín Pedrosa, Fernando
A1 Blanco Val, María Yolanda
A1 Saja Sáez, José Antonio de
A1 Rodríguez Méndez, María Luz
K1 Catechol
K1 Conducting polymers
K1 Electropolymerization
K1 Gold nanoparticles (AuNPs)
K1 Polypyrrole
AB Two different methods were used to obtain polypyrrole/AuNP (Ppy/AuNP) composites. One through the electrooxidation of the pyrrole monomer in the presence of colloidal gold nanoparticles, referred to as trapping method (T), and the second one by electrodeposition of both components from one solution containing the monomer and a gold salt, referred to as cogeneration method (C). In both cases, electrodeposition was carried out through galvanostatic and potentiostatic methods and using platinum (Pt) or stainless steel (SS) as substrates. Scanning electron microscopy (SEM) demonstrated that in all cases gold nanoparticles of similar size were uniformly dispersed in the Ppy matrix. The amount of AuNPs incorporated in the Ppy films was higher when electropolymerization was carried out by chronopotentiometry (CP). Besides, cogeneration method allowed for the incorporation of a higher number of AuNPs than trapping. Impedance experiments demonstrated that the insertion of AuNPs increased the conductivity. As an electrochemical sensor, the Ppy/AuNp deposited on platinum exhibited a strong electrocatalytic activity towards the oxidation of catechol. The effect was higher in films obtained by CP than in films obtained by chronoamperometry (CA). The influence of the method used to introduce the AuNPs (trapping or cogeneration) was not so important. The limits of detection (LOD) were in the range from 10−5 to 10−6 mol/L. LODs attained using films deposited on platinum were lower due to a synergy between AuNPs and platinum that facilitates the electron transfer, improving the electrocatalytic properties. Such synergistic effects are not so pronounced on stainless steel, but acceptable LOD are attained with lower price sensors.
PB Beilstein
YR 2015
FD 2015
LK http://uvadoc.uva.es/handle/10324/21105
UL http://uvadoc.uva.es/handle/10324/21105
LA eng
NO Beilstein Journal of Nanotechnology, October 2015, vol. 6, n. 1, p. 2052-2061
NO Producción Científica
DS UVaDOC
RD 22-nov-2024