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Por favor, use este identificador para citar o enlazar este ítem: http://uvadoc.uva.es/handle/10324/23555
Título: Layered composites of PEDOT/PSS/nanoparticles and PEDOT/PSS/phthalocyanines as electron mediators for sensors and biosensors
Autor: García-Hernández, Celia
García-Cabezón, Cristina
Martín-Pedrosa, Fernando
De Saja, José Antonio
Rodríguez-Méndez, María Luz
Año del Documento: 2016
Descripción: Producción Científica
Documento Fuente: Beilstein Journal of Nanotechnology, 2016, 7, p. 1948–1959
Resumen: The sensing properties of electrodes chemically modified with PEDOT/PSS towards catechol and hydroquinone sensing have been successfully improved by combining layers of PEDOT/PSS with layers of a secondary electrocatalytic material such as gold nanoparticles (PEDOT/PSS/AuNPs), copper phthalocyanine (PEDOT/PSS/CuPc) or lutetium bisphthalocyanine (PEDOT/PSS/LuPc2). Layered composites exhibit synergistic effects that strongly enhance the electrocatalytic activity as indicated by the increase in intensity and the shift of the redox peaks to lower potentials. A remarkable improvement has been achieved using PEDOT/PSS/LuPc2, which exhibits excellent electrocatalytic activity towards the oxidation of catechol. The kinetic studies demonstrated diffusion-controlled processes at the electrode surfaces. The kinetic parameters such as Tafel slopes and charge transfer coefficient (α) confirm the improved electrocatalytic activity of the layered electron mediators. The peak currents increased linearly with concentration of catechol and hydroquinone over the range of 1.5 × 10−4 to 4.0 × 10−6 mol·L−1 with a limit of detection on the scale of μmol·L−1. The layered composite hybrid systems were also found to be excellent electron mediators in biosensors containing tyrosinase and laccase, and they combine the recognition and biocatalytic properties of biomolecules with the unique catalytic features of composite materials. The observed increase in the intensity of the responses allowed detection limits of 1 × 10−7 mol·L−1 to be attained.
Palabras Clave: catechol
gold nanoparticle
hydroquinone
PEDOT/PSS
phthalocyanine
voltammetric sensor
Revisión por Pares: SI
DOI: 10.3762/bjnano.7.186
Patrocinador: Financial support by MINECO-FEDER (AGL2015-67482-R).
Junta de Castilla y Leon FEDER (VA-011U16).
Celia Garcia-Hernandez would also like to thank Junta de Castilla y León for a grant (BOCYL-D-4112015- 9).
Idioma: eng
URI: http://uvadoc.uva.es/handle/10324/23555
Derechos: info:eu-repo/semantics/embargoedAccess
Embargado hasta2220-12-31
Aparece en las colecciones:DEP63 - Artículos de revista



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