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Title: Layered composites of PEDOT:PSS/nanoparticles and PEDOT:PSS/phthalocyanines as electron mediators in sensors and biosensors
Authors: Rodríguez Méndez, María Luz
García Hernández, Celia
García Cabezon, Cristina
Martín Pedrosa, Fernando
De Saja, J.A.
Issue Date: 2016
Citation: Belstein J. Nanotechnology vol. 7 p. 1948-1959
Abstract: 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.
Peer Review: SI
DOI: 10.1177/0021955X16681454
Language: eng
Rights: info:eu-repo/semantics/embargoedAccess
Appears in Collections:DEP63 - Artículos de revista

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