RT info:eu-repo/semantics/article
T1 Layered composites of PEDOT/PSS/nanoparticles and PEDOT/PSS/phthalocyanines as electron mediators for sensors and biosensors
A1 García Hernández, Celia
A1 García Cabezón, Ana Cristina
A1 Martín Pedrosa, Fernando
A1 Saja Sáez, José Antonio de
A1 Rodríguez Méndez, María Luz
K1 Catechol
K1 Gold nanoparticle
K1 Hydroquinone
K1 PEDOT/PSS
K1 Phthalocyanine
K1 Voltammetric sensor
AB 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.
YR 2016
FD 2016
LK http://uvadoc.uva.es/handle/10324/23555
UL http://uvadoc.uva.es/handle/10324/23555
LA eng
NO Beilstein Journal of Nanotechnology, 2016, 7, p. 1948–1959
NO Producción Científica
DS UVaDOC
RD 22-dic-2024