IQUIFIB   02644
INSTITUTO DE QUIMICA Y FISICOQUIMICA BIOLOGICAS "PROF. ALEJANDRO C. PALADINI"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Fused and unzipped carbon nanotubes, electrochemically treated, for selective determination of dopamine and serotonin
Autor/es:
NATALIA JIMENA SACCO; MUÑOZ, FERNANDO F.; BONETTO MARÍA CELINA
Lugar:
caba
Reunión:
Simposio; Exploring the Frontiers of Chemistry: Challenges for the 21st Century; 2019
Institución organizadora:
Facultad de Ciencias Exactas y Naturales (FCEN), University of Buenos Aires
Resumen:
Glassy carbon electrodes (GC) were modified with multiwalled carbon nanotubes (MWCNT/GC) and electrochemically treated first by applying an oxidation potential and then a reductionpotential. The resulting electrodes were charac terized via scanning electron microscopy, Raman spectroscopy, energy dispersive spectroscopy, and electrochemical techniques, particularlycyclic voltammetry using the redox probes Fe(CN)63-/4- and Ru(NH3)2+/3 + and electrochemical impedance spectroscopy using Fe(CN)63-/4-. These modified electrodes showed an electrochemicaldetermination selective for dopamine (DA) and serotonin (5HT) in the presenc e of ascorbic acid (AA) and uric acid (UA), simultaneously measured, with a high reproducibility (an RSD of1.7% for DA and 1.6% for 5HT) and a limit of detection (LOD) of 235 nmol L-1 for DA and 460 nmol L-1 for 5HT. The GC electrodes modified with oxidized MWCNT, subsequently reduced,showed higher selectivity towards the oxidation of DA and 5HT compared with GC bare electrodes or modified with MWCNT or oxidized MWCNT.