Abstract
Portable screen-printed carbon electrodes (SPCE) were uniformly modified with TiO2 and Au nanoparticles (TiO2-AuNPs-SPCE). Synthetized AuNPs were characterized by TEM, showing an average diameter of 17.9±2.3nm. The doped electrodes were characterized using scanning electron microscopy, X-ray photoelectron and Raman spectroscopy. Cyclic voltammetry (CV) performed using as model analytes: an inorganic ([Fe(CN)6]3−/4−) and an organic (catechol) redox probe showed a drastic enhanced of the electrodes electrochemical surface activity and suggested a synergistic catalytic effect between Au NPs and TiO2. Additionally, the electrochemical performance was evaluated for other hydroxyphenols such as hydroquinone, pyrogallol and dopamine. In the case of hydroquinone, the electron transfer rate constant for TiO2-AuNPs-SPCE was estimated to be almost three times faster than for bare SPCE. The results for dopamine also demonstrated remarkably enhanced activity (up to 50%) respect to the non-modified SPCE, showing lower oxidation peak potentials and peak-to-peak separations, as well as, sharper peak current intensities at the TiO2-AuNPs modified SPCE.
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