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oai:uvadoc.uva.es:10324/235552025-02-18T13:41:28Zcom_10324_31661com_10324_952com_10324_894com_10324_1186com_10324_931col_10324_31662col_10324_1404
UVaDOC author García Hernández, Celia author García Cabezón, Ana Cristina author Martín Pedrosa, Fernando author Saja Saez, José Antonio De author Rodríguez Méndez, María Luz 2017-06-19T15:14:47Z 2016 Beilstein Journal of Nanotechnology, 2016, 7, p. 1948–1959 http://uvadoc.uva.es/handle/10324/23555 10.3762/bjnano.7.186 1948 1959 Beilstein Journal of Nanotechnology 7 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. eng Layered composites of PEDOT/PSS/nanoparticles and PEDOT/PSS/phthalocyanines as electron mediators for sensors and biosensors info:eu-repo/semantics/article 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URL https://uvadoc.uva.es/bitstream/10324/23555/3/Layered-composites-PEDOT-PSS.pdf File MD5 fd943b9489bdecc9ce0e4d0bbcb96a33 3843826 application/pdf Layered-composites-PEDOT-PSS.pdf