Carbon Nanotubes Paste Electrodes as new Detectors for Capillary Electrophoresis

Authors
Chicharro, Manuel; Sánchez, Alberto; Bermejo, Esperanza; Zapardiel, Antonio; Rubianes, María Dolores; Rivas, Gustavo Adolfo
Publication Year
2005
Language
English
Format
article
Status
Published version
Description
Carbon nanotubes paste electrodes (CNTPE) prepared with short (1–5 μm length) and long carbon nanotubes (5–20 μm length) of 20–50 nm diameter have demonstrated to be highly useful as detectors in flow injection analysis and capillary electrophoresis. Compared to the classical graphite paste electrode, CNTPE improved the detection limits of dopac, ascorbic acid, dopamine, norepinephrine and epinephrine. The content of agglutinant has shown to be an important variable in the preparation of these carbon nanotubes composites. Even when no substantial differences were observed between the electrodes, those prepared with long carbon nanotubes (55.0%, w/w) and mineral oil (45.0%, w/w) have allowed us to obtain less noisy and more reproducible signals. In this article we also report the successful use of a new electrochemical cell for the detection in capillary electrophoresis that allows an easier handling and more reproducible responses. Therefore, the combination of the carbon nanotubes electrocatalytic activity with the known advantages of composite materials, the efficiency of the new electrochemical cell and the excellent separative properties of capillary electrophoresis represents a very important alternative for new electroanalytical challenges.
Fil: Chicharro, Manuel. Universidad Autónoma de Madrid; España
Fil: Sánchez, Alberto. Universidad Autónoma de Madrid; España
Fil: Bermejo, Esperanza. Universidad Autónoma de Madrid; España
Fil: Zapardiel, Antonio. Universidad Nacional de Educacion a Distancia; España
Fil: Rubianes, María Dolores. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Rivas, Gustavo Adolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Subject
CARBON NANOTUBES
PASTE ELECTRODES
DOPAMINE
Otras Ciencias Químicas
Ciencias Químicas
CIENCIAS NATURALES Y EXACTAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/32934