Electrohemical Properties of Carbon Nanotube Paste Electrodes Modified with Redox Cationic Dyes - doi: 10.4025/actascitechnol.v34i3.15250
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | por eng |
Título da fonte: | Acta scientiarum. Technology (Online) |
Texto Completo: | http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/15250 |
Resumo: | The present work describes the electrochemical behavior of cationic dyes (methylene blue and toluidine blue) as electron mediators adsorbed in the multiwall carbon nanotubes paste in 0.5 KCl at pH 7.0 by using cyclic voltammetry. Based on midpoint potential [Em = (Eap + Ecp)/2] and separation of cathodic and anodic peaks (ΔE), it was not observed interaction of different eletrolytes (LiCl, KCl, BaCl2, CaCl2, NaCl, NaNO3, Na2SO4 and NaClO4), with the cationic dyes by an ion exchange reaction and, as a consequence, absence of leaching of cationic dyes to the solution phase. The kinetics of electron transfer on the surface electrode was not sufficiently fast showing a fairly resistence of carbon nanotube paste modified with the cationic dyes. The midpoint potential and ΔE also were insentive to the pH range (4-8), confirming the protective effect of carbon nanotubes matrix, owing to strong interaction of between the latter and the nitrogen of nitrogen of cationic dyes with carbon nanotube matrix, minimizing the proton interaction under cationic dye. This result is very important for sensor/biosensor preparation, because the eletrooxidation behavior of the analyte will be only affected by its formal potencial shifting. Carbon nanotubes proved to be an efficient solid matrix for the adsorption of mediator electron in comparison to the electrochemical behavior of free cationic dyes in solution phase. |
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Electrohemical Properties of Carbon Nanotube Paste Electrodes Modified with Redox Cationic Dyes - doi: 10.4025/actascitechnol.v34i3.15250Electrohemical properties of carbon nanotube paste electrodes modified with redox cationic dyes - doi: 10.4025/actascitechnol.v34i3.15250carbon nanotubeselectron mediatorcationic dyescyclic voltammetryQuímicacarbon nanotubeselectron mediatorcationic dyescyclic voltammetryThe present work describes the electrochemical behavior of cationic dyes (methylene blue and toluidine blue) as electron mediators adsorbed in the multiwall carbon nanotubes paste in 0.5 KCl at pH 7.0 by using cyclic voltammetry. Based on midpoint potential [Em = (Eap + Ecp)/2] and separation of cathodic and anodic peaks (ΔE), it was not observed interaction of different eletrolytes (LiCl, KCl, BaCl2, CaCl2, NaCl, NaNO3, Na2SO4 and NaClO4), with the cationic dyes by an ion exchange reaction and, as a consequence, absence of leaching of cationic dyes to the solution phase. The kinetics of electron transfer on the surface electrode was not sufficiently fast showing a fairly resistence of carbon nanotube paste modified with the cationic dyes. The midpoint potential and ΔE also were insentive to the pH range (4-8), confirming the protective effect of carbon nanotubes matrix, owing to strong interaction of between the latter and the nitrogen of nitrogen of cationic dyes with carbon nanotube matrix, minimizing the proton interaction under cationic dye. This result is very important for sensor/biosensor preparation, because the eletrooxidation behavior of the analyte will be only affected by its formal potencial shifting. Carbon nanotubes proved to be an efficient solid matrix for the adsorption of mediator electron in comparison to the electrochemical behavior of free cationic dyes in solution phase.The present work describes the electrochemical behavior of methylene blue and toluidine blue as electron mediators adsorbed in the multiwall carbon nanotubes paste. Based on midpoint potential and separation of cathodic and anodic peaks (ΔE), it was not observed interaction of different eletrolytes with the cationic dyes by an ion exchange reaction and, as a consequence, absence of leaching of cationic dyes to the solution phase. The kinetics of electron transfer on the surface electrode was not sufficiently fast showing a fairly resistence of carbon nanotube paste modified with the mediators. The midpoint potential and ΔE also were insentive to the pH range (4-8), confirming the protective effect of carbon nanotubes matrix, owing to strong interaction of between the latter and the nitrogen of nitrogen of cationic dyes with carbon nanotube matrix, minimizing the proton interaction under cationic dye. This result is very important for sensor/biosensor preparation, because the eletrooxidation behavior of the analyte will be only affected by its formal potencial shifting. Carbon nanotubes proved to be an efficient solid matrix for the adsorption of mediator electron in comparison to the electrochemical behavior of free cationic dyes in solution phase. Universidade Estadual De Maringá2012-02-15info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttp://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/1525010.4025/actascitechnol.v34i3.15250Acta Scientiarum. Technology; Vol 34 No 3 (2012); 331-336Acta Scientiarum. Technology; v. 34 n. 3 (2012); 331-3361806-25631807-8664reponame:Acta scientiarum. Technology (Online)instname:Universidade Estadual de Maringá (UEM)instacron:UEMporenghttp://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/15250/pdfhttp://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/15250/pdf_1Antônio, Juliana Maria RamosTarley, César Ricardo TeixeiraPereira, Arnaldo Césarinfo:eu-repo/semantics/openAccess2024-05-17T13:03:28Zoai:periodicos.uem.br/ojs:article/15250Revistahttps://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/indexPUBhttps://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/oai||actatech@uem.br1807-86641806-2563opendoar:2024-05-17T13:03:28Acta scientiarum. Technology (Online) - Universidade Estadual de Maringá (UEM)false |
dc.title.none.fl_str_mv |
Electrohemical Properties of Carbon Nanotube Paste Electrodes Modified with Redox Cationic Dyes - doi: 10.4025/actascitechnol.v34i3.15250 Electrohemical properties of carbon nanotube paste electrodes modified with redox cationic dyes - doi: 10.4025/actascitechnol.v34i3.15250 |
title |
Electrohemical Properties of Carbon Nanotube Paste Electrodes Modified with Redox Cationic Dyes - doi: 10.4025/actascitechnol.v34i3.15250 |
spellingShingle |
Electrohemical Properties of Carbon Nanotube Paste Electrodes Modified with Redox Cationic Dyes - doi: 10.4025/actascitechnol.v34i3.15250 Antônio, Juliana Maria Ramos carbon nanotubes electron mediator cationic dyes cyclic voltammetry Química carbon nanotubes electron mediator cationic dyes cyclic voltammetry |
title_short |
Electrohemical Properties of Carbon Nanotube Paste Electrodes Modified with Redox Cationic Dyes - doi: 10.4025/actascitechnol.v34i3.15250 |
title_full |
Electrohemical Properties of Carbon Nanotube Paste Electrodes Modified with Redox Cationic Dyes - doi: 10.4025/actascitechnol.v34i3.15250 |
title_fullStr |
Electrohemical Properties of Carbon Nanotube Paste Electrodes Modified with Redox Cationic Dyes - doi: 10.4025/actascitechnol.v34i3.15250 |
title_full_unstemmed |
Electrohemical Properties of Carbon Nanotube Paste Electrodes Modified with Redox Cationic Dyes - doi: 10.4025/actascitechnol.v34i3.15250 |
title_sort |
Electrohemical Properties of Carbon Nanotube Paste Electrodes Modified with Redox Cationic Dyes - doi: 10.4025/actascitechnol.v34i3.15250 |
author |
Antônio, Juliana Maria Ramos |
author_facet |
Antônio, Juliana Maria Ramos Tarley, César Ricardo Teixeira Pereira, Arnaldo César |
author_role |
author |
author2 |
Tarley, César Ricardo Teixeira Pereira, Arnaldo César |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Antônio, Juliana Maria Ramos Tarley, César Ricardo Teixeira Pereira, Arnaldo César |
dc.subject.por.fl_str_mv |
carbon nanotubes electron mediator cationic dyes cyclic voltammetry Química carbon nanotubes electron mediator cationic dyes cyclic voltammetry |
topic |
carbon nanotubes electron mediator cationic dyes cyclic voltammetry Química carbon nanotubes electron mediator cationic dyes cyclic voltammetry |
description |
The present work describes the electrochemical behavior of cationic dyes (methylene blue and toluidine blue) as electron mediators adsorbed in the multiwall carbon nanotubes paste in 0.5 KCl at pH 7.0 by using cyclic voltammetry. Based on midpoint potential [Em = (Eap + Ecp)/2] and separation of cathodic and anodic peaks (ΔE), it was not observed interaction of different eletrolytes (LiCl, KCl, BaCl2, CaCl2, NaCl, NaNO3, Na2SO4 and NaClO4), with the cationic dyes by an ion exchange reaction and, as a consequence, absence of leaching of cationic dyes to the solution phase. The kinetics of electron transfer on the surface electrode was not sufficiently fast showing a fairly resistence of carbon nanotube paste modified with the cationic dyes. The midpoint potential and ΔE also were insentive to the pH range (4-8), confirming the protective effect of carbon nanotubes matrix, owing to strong interaction of between the latter and the nitrogen of nitrogen of cationic dyes with carbon nanotube matrix, minimizing the proton interaction under cationic dye. This result is very important for sensor/biosensor preparation, because the eletrooxidation behavior of the analyte will be only affected by its formal potencial shifting. Carbon nanotubes proved to be an efficient solid matrix for the adsorption of mediator electron in comparison to the electrochemical behavior of free cationic dyes in solution phase. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-02-15 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/15250 10.4025/actascitechnol.v34i3.15250 |
url |
http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/15250 |
identifier_str_mv |
10.4025/actascitechnol.v34i3.15250 |
dc.language.iso.fl_str_mv |
por eng |
language |
por eng |
dc.relation.none.fl_str_mv |
http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/15250/pdf http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/15250/pdf_1 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Estadual De Maringá |
publisher.none.fl_str_mv |
Universidade Estadual De Maringá |
dc.source.none.fl_str_mv |
Acta Scientiarum. Technology; Vol 34 No 3 (2012); 331-336 Acta Scientiarum. Technology; v. 34 n. 3 (2012); 331-336 1806-2563 1807-8664 reponame:Acta scientiarum. Technology (Online) instname:Universidade Estadual de Maringá (UEM) instacron:UEM |
instname_str |
Universidade Estadual de Maringá (UEM) |
instacron_str |
UEM |
institution |
UEM |
reponame_str |
Acta scientiarum. Technology (Online) |
collection |
Acta scientiarum. Technology (Online) |
repository.name.fl_str_mv |
Acta scientiarum. Technology (Online) - Universidade Estadual de Maringá (UEM) |
repository.mail.fl_str_mv |
||actatech@uem.br |
_version_ |
1799315334427049984 |