Analytical applications of glassy carbon electrodes modified with multi-wall carbon nanotubes dispersed in polyethylenimine as detectors in flow systems

ALBERTO SÁNCHEZ ARRIBAS, ESPERANZA BERMEJO, MANUEL CHICHARRO, ANTONIO ZAPARDIEL, GUILLERMINA L. LUQUE, NANCY F. FERREYRA, GUSTAVO A. RIVAS

ELSEVIER SCIENCE BV

Año: 2007 vol. 596 p. 183 - 183

font size="1" face="Times-Roman"> This work reports the advantages of using glassy carbon electrodes (GCEs) modified with multi-wall carbon nanotubes (CNT) dispersedin polyethylenimine (PEI) as detectors in flow injection and capillary electrophoresis. The presence of the dispersion of CNT in PEI at the electrode surface allows the highly sensitive and reproducible determination of hydrogen peroxide, different neurotransmitters (dopamine (D) and its metabolite dopac, epinephrine (E), norepinephrine (NE)), phenolic compounds (phenol (P), 3-chlorophenol (3-CP) and 2,3-dichlorophenol (2,3CP)) and herbicides (amitrol). Sensitivities enhancements of 150 and 140 folds compared to GCE were observed for hydrogen peroxide and amitrol, respectively. One of the most remarkable properties of the resulting electrode is the antifouling effect of the CNT/PEI layer. No  passsivation was observed either for successive additions (30) or continuous flow (for 30 min) of the compou