Electrooxidation of DNA at glassy carbon electrodes modified with multi-walled carbon nanotubes with different oxidation degree
Author
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Cañete Rosales, Paulina
Author
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Álvarez Lueje, Alejandro
es_CL
Author
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Bollo Dragnic, Soledad
es_CL
Admission date
dc.date.accessioned
2015-01-06T18:18:13Z
Available date
dc.date.available
2015-01-06T18:18:13Z
Publication date
dc.date.issued
2014
Cita de ítem
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J. Chil. Chem. Soc. vol.59 no.2 Concepción jul. 2014
en_US
Identifier
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0717-9707
Identifier
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http://dx.doi.org/10.4067/S0717-97072014000200021
Identifier
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https://repositorio.uchile.cl/handle/2250/121962
General note
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Artículo de publicación SciELO
en_US
Abstract
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For the first time, the study of the effect of length and degree of oxidation of multi-walled carbon nanotubes (CNTs) on the electroanalytical DNA sensing properties of modified glassy carbon electrodes (GCEs) is reported. GCE/CNT electrodes were prepared using chitosan (CHI) as a dispersing agent. Short (S-NCs) and long (L-NCs) carbon nanotubes, as well as unoxidized and 3 or 6 hour oxidized samples were used. Cyclic voltammetry indicated that S-NCs exhibited larger capacitance values than L-NCs, and that these values increased when the CNTs were oxidized. Using Scanning Electrochemical Microscopy (SECM), an increase in the surface homogeneity was determined when oxidized CNTs were used as electrode modifiers. dsDNA electrooxidation showed the highest response using GCEs/CHI-L-NCs, and a clear decrease in the current intensity was observed when the oxidation time was increased. This result correlates with the higher BET surface area of L-NCs. In conclusion, the electrochemical performance of GCE/CNT electrodes against DNA increase when the length of CNTs is higher and decrease at higher oxidation state.
en_US
Patrocinador
dc.description.sponsorship
Financial support from the Fondecyt-CHILE (Grant 1120246) is gratefully acknowledged. P.C. acknowledges CONICYT scholarships for PhD studies in Chile, PhD scholarship support (AT-24091012) and PhD fellowship study abroad (BECAS-CHILE)