Glassy Carbon Electrodes Modified with Multiwall Carbon Nanotubes Dispersed in Polylisine.

YAMILE JALIT; MARCELA C. RODRÍGUEZ; MARÍA D. RUBIANES; SOLEDAD BOLLO; GUSTAVO A. RIVAS

Wiley-VCH Verlang GmbH & Co, KgaA, Weinheimv

Lugar: Las Cruces, New México, EEUU; Año: 2008 vol. 20 p. 1623 - 1623

font face="ArialMT" size="3"> We report the analytical performance of glassy carbon electrodes (GCE) modified with a dispersion of multi-wall carbon nanotubes (MWCNT) in polylysine (Plys) (GCE/MWCNT-Plys). The resulting electrodes show an excellent electrocatalytic activity towards different bioanalytes like ascorbic acid, uric acid and hydrogen peroxide, with important decrease in their oxidation overvoltages. The dispersion of 1.0 mg/mL MWCNT in 1.0 mg/mL polylysine is highly stable, since after 2 weeks the sensitivity for hydrogen peroxide at GCE modified with this dispersion remained in a 90 % of the original value. The MWCNT-Plys layer immobilized on glassy carbon electrodes has been also used as a platform to build supramolecular architectures by self-assembling of polyelectrolytes based on the polycationic nature of the polylysine used to disperse the nanotubes. The self-assembling of glucose oxidase has allowed us to obtain a supramolecular multist