Assessment of the Electrochemical Behavior of Two-Dimensional Networks of Single-Walled Carbon Nanotubes

Scanning electrochemical microscopy (SECM) has been employed in the feedback mode to assess the electrochemical behavior of two-dimensional networks of single-walled carbon nanotubes (SWNTs). It is shown that, even though the network comprises both metallic and semiconducting SWNTs, at high density...

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Authors: Wilson, Neil R., Guille, Manon, Dumitrescu, Ioana, Ruiz Fernández, Virginia, Rudd, Nicola C., Williams, Cara G., Unwin, Patrick R., Macpherson, Julie V.
Format: article
Status:Versión aceptada para publicación
Publication Date:2006
Country:España
Institution:Universidad de Burgos (UBU)
Repository:Repositorio Institucional de la Universidad de Burgos (RIUBU)
OAI Identifier:oai:riubu.ubu.es:10259/11091
Online Access:https://hdl.handle.net/10259/11091
Access Level:Open access
Keyword:Carbon nanotubes
Diffusion
Electrical conductivity
Electrodes
Redox reactions
Electroquímica
Química analítica
Electrochemistry
Chemistry, Analytic
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spelling Assessment of the Electrochemical Behavior of Two-Dimensional Networks of Single-Walled Carbon NanotubesWilson, Neil R.Guille, ManonDumitrescu, IoanaRuiz Fernández, VirginiaRudd, Nicola C.Williams, Cara G.Unwin, Patrick R.Macpherson, Julie V.Carbon nanotubesDiffusionElectrical conductivityElectrodesRedox reactionsElectroquímicaQuímica analíticaElectrochemistryChemistry, AnalyticScanning electrochemical microscopy (SECM) has been employed in the feedback mode to assess the electrochemical behavior of two-dimensional networks of single-walled carbon nanotubes (SWNTs). It is shown that, even though the network comprises both metallic and semiconducting SWNTs, at high density (well above the percolation threshold for metallic SWNTs) and with approximately millimolar concentrations of redox species the network behaves as a thin metallic film, irrespective of the formal potential of the redox couple. This result is particularly striking since the fractional surface coverage of SWNTs is only ∼1% and SECM delivers high mass transport rates to the network. Finite element simulations demonstrate that under these conditions diffusional overlap between neighboring SWNTs is significant so that planar diffusion prevails in the gap between the SECM tip and the underlying SWNT substrate. The SECM feedback response diminishes at higher concentrations of the redox species. However, wet gate measurements show that at the solution potentials of interest the conductivity is sufficiently high that lateral conductivity is not expected to be limiting. This suggests that reaction kinetics may be a limiting factor, especially since the low surface coverage of the SWNT network results in large fluxes to the SWNTs, which are characterized by a low density of electronic states. For electroanalytical purposes, significantly, two-dimensional SWNT networks can be considered as metallic films for typical millimolar concentrations employed in amperometry and voltammetry. Moreover, SWNT networks can be inexpensively and easily formed over large scales, opening up the possibility of further electroanalytical applications.J.V.M. thanks the Royal Society for the award of a University Research Fellowship. N.R.W. thanks the EPSRC for funding (EP/C518268/1). V.R.F. and M.G. thank the EU Human Potential Programme SUSANA (Supramolecular Self-Assembly of Interfacial Nanostructures, contract HPRN-CT-2002-00185) and Marie Curie Fellowship Fund, respectively. N.C.R. and I.D. thank the University of Warwick for Postgraduate Fellowship Awards. We also acknowledge the assistance of Mr. Tom Day and Mr. Jonathan Edgeworth (Warwick Chemistry) for providing us with SWNT network samples.American Chemical Society202520252006info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/10259/11091reponame:Repositorio Institucional de la Universidad de Burgos (RIUBU)instname:Universidad de Burgos (UBU)InglésAnalytical Chemistry. 2006, V. 78, n.19, p. 7006–7015https://doi.org/10.1021/ac0610661info:eu-repo/semantics/openAccessoai:riubu.ubu.es:10259/110912026-05-28T07:56:11Z
dc.title.none.fl_str_mv Assessment of the Electrochemical Behavior of Two-Dimensional Networks of Single-Walled Carbon Nanotubes
title Assessment of the Electrochemical Behavior of Two-Dimensional Networks of Single-Walled Carbon Nanotubes
spellingShingle Assessment of the Electrochemical Behavior of Two-Dimensional Networks of Single-Walled Carbon Nanotubes
Wilson, Neil R.
Carbon nanotubes
Diffusion
Electrical conductivity
Electrodes
Redox reactions
Electroquímica
Química analítica
Electrochemistry
Chemistry, Analytic
title_short Assessment of the Electrochemical Behavior of Two-Dimensional Networks of Single-Walled Carbon Nanotubes
title_full Assessment of the Electrochemical Behavior of Two-Dimensional Networks of Single-Walled Carbon Nanotubes
title_fullStr Assessment of the Electrochemical Behavior of Two-Dimensional Networks of Single-Walled Carbon Nanotubes
title_full_unstemmed Assessment of the Electrochemical Behavior of Two-Dimensional Networks of Single-Walled Carbon Nanotubes
title_sort Assessment of the Electrochemical Behavior of Two-Dimensional Networks of Single-Walled Carbon Nanotubes
dc.creator.none.fl_str_mv Wilson, Neil R.
Guille, Manon
Dumitrescu, Ioana
Ruiz Fernández, Virginia
Rudd, Nicola C.
Williams, Cara G.
Unwin, Patrick R.
Macpherson, Julie V.
author Wilson, Neil R.
author_facet Wilson, Neil R.
Guille, Manon
Dumitrescu, Ioana
Ruiz Fernández, Virginia
Rudd, Nicola C.
Williams, Cara G.
Unwin, Patrick R.
Macpherson, Julie V.
author_role author
author2 Guille, Manon
Dumitrescu, Ioana
Ruiz Fernández, Virginia
Rudd, Nicola C.
Williams, Cara G.
Unwin, Patrick R.
Macpherson, Julie V.
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Carbon nanotubes
Diffusion
Electrical conductivity
Electrodes
Redox reactions
Electroquímica
Química analítica
Electrochemistry
Chemistry, Analytic
topic Carbon nanotubes
Diffusion
Electrical conductivity
Electrodes
Redox reactions
Electroquímica
Química analítica
Electrochemistry
Chemistry, Analytic
description Scanning electrochemical microscopy (SECM) has been employed in the feedback mode to assess the electrochemical behavior of two-dimensional networks of single-walled carbon nanotubes (SWNTs). It is shown that, even though the network comprises both metallic and semiconducting SWNTs, at high density (well above the percolation threshold for metallic SWNTs) and with approximately millimolar concentrations of redox species the network behaves as a thin metallic film, irrespective of the formal potential of the redox couple. This result is particularly striking since the fractional surface coverage of SWNTs is only ∼1% and SECM delivers high mass transport rates to the network. Finite element simulations demonstrate that under these conditions diffusional overlap between neighboring SWNTs is significant so that planar diffusion prevails in the gap between the SECM tip and the underlying SWNT substrate. The SECM feedback response diminishes at higher concentrations of the redox species. However, wet gate measurements show that at the solution potentials of interest the conductivity is sufficiently high that lateral conductivity is not expected to be limiting. This suggests that reaction kinetics may be a limiting factor, especially since the low surface coverage of the SWNT network results in large fluxes to the SWNTs, which are characterized by a low density of electronic states. For electroanalytical purposes, significantly, two-dimensional SWNT networks can be considered as metallic films for typical millimolar concentrations employed in amperometry and voltammetry. Moreover, SWNT networks can be inexpensively and easily formed over large scales, opening up the possibility of further electroanalytical applications.
publishDate 2006
dc.date.none.fl_str_mv 2006
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/10259/11091
url https://hdl.handle.net/10259/11091
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Analytical Chemistry. 2006, V. 78, n.19, p. 7006–7015
https://doi.org/10.1021/ac0610661
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Chemical Society
publisher.none.fl_str_mv American Chemical Society
dc.source.none.fl_str_mv reponame:Repositorio Institucional de la Universidad de Burgos (RIUBU)
instname:Universidad de Burgos (UBU)
instname_str Universidad de Burgos (UBU)
reponame_str Repositorio Institucional de la Universidad de Burgos (RIUBU)
collection Repositorio Institucional de la Universidad de Burgos (RIUBU)
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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