RT info:eu-repo/semantics/article T1 Electrochemical sensors modified with combinations of sulfur containing phthalocyanines and capped gold nanoparticles: A study of the influence of the nature of the interaction between sensing materials A1 Ruiz Carmuega, Ana Isabel A1 García Hernández, Celia A1 Ortiz, Javier A1 García Cabezón, Ana Cristina A1 Martín Pedrosa, Fernando A1 Sastre Santos, Ángela A1 Rodríguez Pérez, Miguel Ángel A1 Rodríguez Méndez, María Luz K1 Electrochemical sensors K1 Sensores electroquímicos K1 Phthalocyanine K1 Ftalocianina K1 Gold nanoparticles K1 Nanopartículas de oro K1 Catechol K1 Catecol AB Voltametric sensors formed by the combination of a sulfur-substituted zinc phthalocyanine (ZnPcRS) and gold nanoparticles capped with tetraoctylammonium bromide (AuNPtOcBr) have been developed. The influence of the nature of the interaction between both components in the response towards catechol has been evaluated. Electrodes modified with a mixture of nanoparticles and phthalocyanine (AuNPtOcBr/ZnPcRS) show an increase in the intensity of the peak associated with the reduction of catechol. Electrodes modified with a covalent adduct-both component are linked through a thioether bond-(AuNPtOcBr-S-ZnPcR), show an increase in the intensity of the oxidation peak. Voltammograms registered at increasing scan rates show that charge transfer coefficients are different in both types of electrodes confirming that the kinetics of the electrochemical reaction is influenced by the nature of the interaction between both electrocatalytic materials. The limits of detection attained are 0.9 × 10−6 mol∙L−1 for the electrode modified with the mixture AuNPtOcBr/ZnPcRS and 1.3 × 10−7 mol∙L−1 for the electrode modified with the covalent adduct AuNPtOcBr-S-ZnPcR. These results indicate that the establishment of covalent bonds between nanoparticles and phthalocyanines can be a good strategy to obtain sensors with enhanced performance, improving the charge transfer rate and the detection limits of voltammetric sensors. PB MDPI SN 2079-4991 YR 2019 FD 2019 LK http://uvadoc.uva.es/handle/10324/40955 UL http://uvadoc.uva.es/handle/10324/40955 LA eng NO Nanomaterials, 2019, vol. 9, n. 11. 14 p. NO Producción Científica DS UVaDOC RD 29-mar-2024