Gold nanowire electrodes in array: Simulation study and experiments

Show simple item record Wahl, Amélie Dawson, Karen MacHale, John Barry, Seán T. Quinn, Aidan J. O'Riordan, Alan 2014-09-01T14:43:30Z 2014-09-01T14:43:30Z 2013-04-15
dc.identifier.citation WAHL, A., DAWSON, K., MACHALE, J., BARRY, S., QUINN, A. J. & O'RIORDAN, A. 2013. Gold nanowire electrodes in array: simulation study and experiments. Faraday Discussions, 164, 377-390. DOI10.1039/C3FD00025G en
dc.identifier.volume 164 en
dc.identifier.startpage 377 en
dc.identifier.endpage 390 en
dc.identifier.issn 1359-6640
dc.identifier.doi 10.1039/C3FD00025G
dc.description.abstract Recent developments in nanofabrication have enabled fabrication of robust and reproducible nanoelectrodes with enhanced performance, when compared to microelectrodes. A hybrid electron beam/photolithography technique is shown that permits gold nanowire array electrodes to be routinely fabricated at reasonable cost. Fabricated devices include twelve gold nanowire working electrode arrays, an on-chip gold counter electrode and an on-chip platinum pseudo reference electrode. Using potential sweep techniques, these nanowires exhibit measurable currents in the nanoAmpere regime and display steady-state voltammograms even at very high scan rates (5000 mV.s-1) indicative of fast analyte mass transport to the electrode. Nanowire electrode arrays offer the potential for enhancements in electroanalysis including: increased signal to noise ratio and increased sensitivity while also allowing quantitative detection at much lower concentrations. However, to achieve this goal a full understanding of the diffusion profiles existing at nanowire arrays is required. To this end, we simulate the effects of altering inter-electrode separations on analyte diffusion for a range of scan rates at nanowire electrode arrays, and perform the corresponding experiments. We show that arrays with diffusionally independent concentration profiles demonstrate superior electrochemical performance compared to arrays with overlapping diffusion profiles when employing sweep voltammetric techniques. By contrast, we show that arrays with diffusionally overlapping profiles exhibit enhanced performance when employing step voltammetric techniques. en
dc.description.sponsorship Higher Education Authority (PRTLI programs (Cycle 3 “Nanoscience” and Cycle 4 “INSPIRE"); Science Foundation Ireland (Research Frontiers Programme (SFI/09/RFP/CAP2455)), European Commission (FP7 Security Project CommonSense (261809) and FP7 ICT project “Nanofunction” (257375)); en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher The Royal Society of Chemistry en
dc.rights © The Royal Society of Chemistry 2013 en
dc.subject Gold nanowire electrode arrays en
dc.subject Nanofabrication en
dc.title Gold nanowire electrodes in array: Simulation study and experiments 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: en
dc.internal.availability Full text available en 2013-04-26T12:56:56Z
dc.description.version Accepted Version en
dc.internal.rssid 208474469
dc.internal.rssid 288086109
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 Faraday Discussions en
dc.internal.copyrightchecked Yes. AV + 12 month embargo en
dc.internal.licenseacceptance Yes en

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