Glassy carbon electrodes modified with carbon nanotubes dispersed in polyethylenimine and polylysine. Analytical applications.

G. A. RIVAS, M. D. RUBIANES, G. L. LUQUE, N. F. FERREYRA, Y. JALIT, M. C. RODRÍGUEZ, A. SÁNCHEZ, M. CHICHARRO, E. BERMEJO, A. ZAPARDIEL, S. BOLLO

Sevilla, España

Congreso; 59th Annual Meeting of the Internacional Society of Electrochemistry (ISE); 2008

Internacional Society of Electrochemistry (ISE)

This work reports the performance of glassy carbon electrodes (GCE) modified by deposition of multi-walled carbon nanotubes (MWCNT) dispersed in polyethylenimine (PEI) and polylysine (Plys). In both cases, even when MWCNT are distributed in the whole electrode surface, there are regions with different conductivity. GCE modified with MWCNT dispersed in PEI (GCE/PEI-CNT) or in Plys (GCE/Plys-CNT) showed an excellent electrocatalytic activity toward different bioanalytes like ascorbic acid (AA), dopamine (Do), hydrogen peroxide, dopac, amitrol and phenolic compounds. The adsorption of single and double stranded DNA at GCE/PEI-MWCNT as well as the selective determination of Do in the presence of large excess of AA and serotonin was also studied.