Electrohemical properties of carbon nanotube paste electrodes modified with redox cationic dyes
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidade Estadual de Maringá
2012
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| _version_ | 1876484527153479680 |
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| author | Juliana Maria Ramos Antonio |
| author_facet | Juliana Maria Ramos Antonio |
| contents | Electrohemical properties of carbon nanotube paste electrodes modified with redox cationic dyes Juliana Maria Ramos Antonio César Ricardo Teixeira Tarley Arnaldo César Pereira Ingeniería cationic dyes Carbon nanotubes electron mediator cyclic voltammetry 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 2012 artículo científico 1806-2563 https://www.redalyc.org/articulo.oa?id=303226542012 en http://www.redalyc.org/revista.oa?id=3032 Acta Scientiarum. Technology application/pdf Universidade Estadual de Maringá Acta Scientiarum. Technology (Brasil) Num.3 Vol.34 |
| format | Artículo científico |
| id | redalyc_303226542012 |
| institution | Redalyc |
| language | en |
| publishDate | 2012 |
| publisher | Universidade Estadual de Maringá |
| spellingShingle | Electrohemical properties of carbon nanotube paste electrodes modified with redox cationic dyes Juliana Maria Ramos Antonio Ingeniería cationic dyes Carbon nanotubes electron mediator cyclic voltammetry Electrohemical properties of carbon nanotube paste electrodes modified with redox cationic dyes Juliana Maria Ramos Antonio César Ricardo Teixeira Tarley Arnaldo César Pereira Ingeniería cationic dyes Carbon nanotubes electron mediator cyclic voltammetry 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 2012 artículo científico 1806-2563 https://www.redalyc.org/articulo.oa?id=303226542012 en http://www.redalyc.org/revista.oa?id=3032 Acta Scientiarum. Technology application/pdf Universidade Estadual de Maringá Acta Scientiarum. Technology (Brasil) Num.3 Vol.34 |
| title | Electrohemical properties of carbon nanotube paste electrodes modified with redox cationic dyes |
| topic | Ingeniería cationic dyes Carbon nanotubes electron mediator cyclic voltammetry |
| url | https://www.redalyc.org/articulo.oa?id=303226542012 |