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Fundamental Electrochemical Properties of Carbon Nanotube Electrodes

Papakonstantinou, P, Kern, R, Robinson, L, Murphy, H, Irvine, J, McAdams, ET, McLaughlin, JAD and McNally, T (2005) Fundamental Electrochemical Properties of Carbon Nanotube Electrodes. Fullerenes, Nanotubes and Carbon Nanostructures, 13 (2). pp. 91-108. [Journal article]

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URL: http://dx.doi.org/10.1081/FST-200050684

DOI: doi:10.1081/FST-200050684


We report on the fundamental electrochemical properties of inherently hydrophobic Multiwalled Carbon Nanotubes MWNT electrodes and acid treated MWNTs. The electrochemical response of the electrodes was investigated by cyclic voltammetry and ac impedance spectroscopy using the redox probe of (Fe(CN)63-/Fe(CN)64-, which has well-known kinetic behaviour on carbon surfaces. Comparisons were made between the electrochemical behaviour observed at MWNT electrodes and electrochemically polished glassy carbon, GCE. Confirmation of carbon oxygen functionalities on the surface of acid treated nanotubes was accomplished by X-ray photoelectron spectroscopy. Slow electron transfer kinetics with a peak separation larger than 200 eV, and an electron transfer resistance of approximately 370 were observed on pristine MWNTs. However acid treatment was found to significantly improve the electron transfer kinetics of Fe(CN)6-3/-4 redox couple, approaching almost reversible ET kinetics. Acid treatment modifies the charge carrier density at the surface by introducing surface states and serves to facilitate electron transfer. The better wetting properties of functionalised carbon nanotubes and the higher local density of states as compared to untreated MWNT could be responsible for favouring faster ET kinetics. Copyright Taylor & Francis 2005

Item Type:Journal article
Keywords:Electrochemical sensors; oxidation; impedance spectroscopy; acid treatment; electron transfer kinetics
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:1250
Deposited By: Mrs Ann Blair
Deposited On:27 Nov 2009 13:54
Last Modified:09 Dec 2015 09:57

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