Electrochemical behaviour of different redox probes on single wall carbon nanotube buckypaper-modified electrodes

In the present work, the electrochemical properties of single-walled carbon nanotube buckypapers (BPs) were examined in terms of carbon nanotubes nature and preparation conditions. The performance of the different free-standing single wall carbon nanotube sheets was evaluated via cyclic voltammetry...

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Bibliographic Details
Published in:Electrochimica acta 2014-07, Vol.135, p.404-411
Main Authors: Sieben, J.M., Ansón-Casaos, A., Montilla, F., Martínez, M.T., Morallón, E.
Format: Article
Language:English
Subjects:
Aqueous electrolytes
buckypaper
Carbon nanotubes
Current density
electrochemical properties
Electrodes
Electron transfer
Nanostructure
redox probes
Sensing devices
Single wall carbon nanotubes
single-walled carbon nanotubes
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Summary:In the present work, the electrochemical properties of single-walled carbon nanotube buckypapers (BPs) were examined in terms of carbon nanotubes nature and preparation conditions. The performance of the different free-standing single wall carbon nanotube sheets was evaluated via cyclic voltammetry of several redox probes in aqueous electrolyte. Significant differences are observed in the electron transfer kinetics of the buckypaper-modified electrodes for both the outer- and inner-sphere redox systems. These differences can be ascribed to the nature of the carbon nanotubes (nanotube diameter, chirality and aspect ratio), surface oxidation degree and type of functionalities. In the case of dopamine, ferrocene/ferrocenium, and quinone/hydroquinone redox systems the voltammetric response should be thought as a complex contribution of different tips and sidewall domains which act as mediators for the electron transfer between the adsorbate species and the molecules in solution. In the other redox systems only nanotube ends are active sites for the electron transfer. It is also interesting to point out that a higher electroactive surface area not always lead to an improvement in the electron transfer rate of various redox systems. In addition, the current densities produced by the redox reactions studied here are high enough to ensure a proper electrochemical signal, which enables the use of BPs in sensing devices.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2014.05.016