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dc.contributor.author
Gasnier, Aurelien
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Pedano, Maria Laura
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Gutierrez, Fabiana Andrea
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Labbé, Pierre
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Rivas, Gustavo Adolfo
dc.contributor.author
Rubianes, María Dolores
dc.date.available
2018-10-11T20:48:28Z
dc.date.issued
2012-06
dc.identifier.citation
Gasnier, Aurelien; Pedano, Maria Laura; Gutierrez, Fabiana Andrea; Labbé, Pierre; Rivas, Gustavo Adolfo; et al.; Glassy carbon electrodes modified with a dispersion of multi-wall carbon nanotubes in dopamine-functionalized polyethylenimine: Characterization and analytical applications for nicotinamide adenine dinucleotide quantification; Pergamon-Elsevier Science Ltd; Electrochimica Acta; 71; 6-2012; 73-81
dc.identifier.issn
0013-4686
dc.identifier.uri
http://hdl.handle.net/11336/62255
dc.description.abstract
We report the characterization of a dispersion of multi-wall carbon nanotubes (CNT) in a solution of polyethylenimine (PEI) functionalized with dopamine (Do), the electrochemical behavior of glassy carbon electrodes (GCE) modified with the resulting dispersion, and its analytical application for the highly sensitive quantification of NADH without fouling of the surface. The dispersion was obtained by sonicating for 60 min 1.0 mg CNT in 1.0 mL of 1.0 mg/mL PEI-Do solution prepared in 50/50 (v/v) ethanol/water. The presence of Do covalently bonded to PEI promotes hydrophobic π interactions with the CNT walls and improves significantly the dispersability of CNT in this mixture. The dispersion is highly stable since after 2 months resting at room temperature no phase separation was observed. This dispersion was dropcoated over GCE, and after solvent evaporation, a very reproducible and uniform coverage was obtained. An electrochemical pretreatment (activation) of such a modified GCE electrode allowed the sensitive quantification of NADH at potentials as low as -0.025 V. The response of NADH at the electrochemically activated GCE modified with the dispersion of CNT in PEI-Do solution (GCE/CNT-PEI-Do), demonstrated to be highly reproducible. The R.S.D. for the NADH sensitivity obtained with 15 electrodes and 3 different dispersions was 8.9%. Even more important, after 10 calibrations for NADH with the same surface the decrease in the sensitivity was smaller than 10%. The dispersion was characterized by Field Emission Scanning Electron Microscopy (FE-SEM), Fourier Transform Infrared Spectroscopy (FT-IR) while the electrodes modified with the dispersion were evaluated using different electrochemical techniques (Cyclic voltammetry (CV), Amperometry and Electrochemical Impedance Spectroscopy (EIS)). © 2012 Elsevier Ltd. All rights reserved.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Carbon Nanotubes Functionalization
dc.subject
Dopamine
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Electrochemical Sensor
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Nadh
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Polyethylenimine
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Otras Ciencias Químicas
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Ciencias Químicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Glassy carbon electrodes modified with a dispersion of multi-wall carbon nanotubes in dopamine-functionalized polyethylenimine: Characterization and analytical applications for nicotinamide adenine dinucleotide quantification
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-09-18T16:15:17Z
dc.journal.volume
71
dc.journal.pagination
73-81
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Gasnier, Aurelien. 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
dc.description.fil
Fil: Pedano, Maria Laura. 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
dc.description.fil
Fil: Gutierrez, Fabiana Andrea. 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
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Fil: Labbé, Pierre. Universite Joseph Fourier; Francia
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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
dc.description.fil
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
dc.journal.title
Electrochimica Acta
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0013468612004252
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1016/j.electacta.2012.03.073
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