Carbon Nanotubes Paste Electrode

MARÍA D. RUBIANES; GUSTAVO A. RIVAS

Elsevier

Lugar: Oxford, England; Año: 2003 vol. 5 p. 689 - 689

p class="MsoNormal" style="margin: 0cm 0cm 0pt 36pt; text-align: justify;">The performance of carbon nanotubes paste electrodes (CNTPE) prepared by dispersion of multi-wall carbon nanotubos (MWNT) within mineral oil is described. The resulting electrode shows an excellent electrocatalytic activity toward ascorbic acid, uric acid, dopamine, 3,4-dihydroxyphenylacetic acid (dopac) and hydrogen peroxide. These properties permit an important decrease in the overvoltage for the oxidation of ascorbic acid (230 mV), uric acid (160 mV) and hydrogen peroxide (300 mV) as well as a dramatic improvement in the reversibility of the redox behavior of dopamine and dopac, in comparison with the classical carbon (graphite) paste electrodes (CPE). The substantial decrease in the overvoltage of the hydrogen peroxide reduction (400 mV) associated with a successful incorporation ofglucose oxidase (GOx) into the composite material, allow the devel