Electroanalysis at discrete arrays of gold nanowire electrodes

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dc.contributor.author Dawson, Karen
dc.contributor.author Baudequin, Marine
dc.contributor.author Sassiat, Nicolas
dc.contributor.author Quinn, Aidan J.
dc.contributor.author O'Riordan, Alan
dc.date.accessioned 2014-09-02T08:59:53Z
dc.date.available 2014-09-02T08:59:53Z
dc.date.issued 2013-07-01
dc.identifier.citation DAWSON, K., BAUDEQUIN, M., SASSIAT, N., QUINN, A. J. & O’RIORDAN, A. 2013. Electroanalysis at discrete arrays of gold nanowire electrodes. Electrochimica Acta, 101, 169-176. doi: 10.1016/j.electacta.2012.09.105 en
dc.identifier.volume 101 en
dc.identifier.startpage 169 en
dc.identifier.endpage 176 en
dc.identifier.issn 0013-4686
dc.identifier.uri http://hdl.handle.net/10468/1643
dc.identifier.doi 10.1016/j.electacta.2012.09.105
dc.description.abstract The development of reliable nanosensors offers a number of potential advantages in nanoscale analytical science. A hybrid electron beam-photolithography process was used to fabricate robust and reliable electrochemical nanowire array devices, with highly reproducible critical dimensions, 100 ± 6 nm. Nanowire electrode arrays were designed to permit diffusional independence at each nanowire element in an array thereby maximising limiting currents for optimised electrochemical nanosensing. The electrochemical behaviour of discrete nanowire electrode arrays was investigated using cyclic voltammetry in ferrocenemonocarboxylic acid. Single nanowire devices yielded highly reproducible steady-state sigmoidal waveforms, with typical currents of 179 ± 16 pA. Higher steady-state currents were achieved at nanowire arrays, up to ∼1.2 nA for arrays consisting of six nanowire elements. At low and intermediate scan rates, sigmoidal waveforms were observed for nanowire arrays indicating very fast mass transport. However, voltammetric behaviour consistent with semi-infinite linear diffusion was observed at higher scan rates confirming the presence of overlapping diffusion profiles between neighbouring nanowires within an array. The existence of diffusion overlap between neighbouring nanowire elements was further demonstrated by deviation of measured steady-state currents from estimates, becoming more pronounced with increasing numbers on nanowire elements in the array. Finally capacitive charging of the electrodes was explored, and were found to exhibit very low capacitance typically ∼31 ± 3 nF cm−2 per device, three orders of magnitude less than that reported for conventional microelectrodes (∼20 μF cm−2). en
dc.description.sponsorship Higher Education Authority (PRTLI programmes (Cycle 3 “Nanoscience” and Cycle 4 “INSPIRE”)); Science Foundation Ireland (Research Frontiers Programme (SFI/09/RFP/CAP2455)); European Commission (FP7 Security Project CommonSense (261809)) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Elsevier en
dc.relation.uri http://www.sciencedirect.com/science/article/pii/S0013468612015836
dc.rights © 2012 Elsevier Ltd. All rights reserved. NOTICE: this is the author’s version of a work that was accepted for publication in Electrochimica Acta. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Electrochimica Acta, [Volume 101, 1 July 2013, Pages 169–176] DOI: 10.1016/j.electacta.2012.09.105 en
dc.subject Nanowire en
dc.subject Nanoelectrochemistry en
dc.subject Electroanalysis en
dc.subject Diffusion en
dc.subject Capacitance en
dc.title Electroanalysis at discrete arrays of gold nanowire electrodes en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Alan O'Riordan, Tyndall Micronano Electronics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: alan.oriordan@tyndall.ie en
dc.internal.availability Full text available en
dc.date.updated 2013-04-26T12:57:08Z
dc.description.version Accepted Version en
dc.internal.rssid 208474418
dc.internal.rssid 288086095
dc.contributor.funder Higher Education Authority en
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder European Commission
dc.description.status Peer reviewed en
dc.identifier.journaltitle Electrochimica Acta en
dc.internal.copyrightchecked No. CORA - AV + set statement en
dc.internal.licenseacceptance Yes en

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