Chemically modified electrodes for recessed microelectrode array

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dc.contributor.authorMohd Said, Nur Azura
dc.contributor.authorOgurtsov, Vladimir I.
dc.contributor.authorTwomey, Karen
dc.contributor.authorNagle, Lorraine C.
dc.contributor.authorHerzog, G.
dc.contributor.funderInstitut Penyelidikan dan Kemajuan Pertanian Malaysiaen
dc.date.accessioned2018-07-12T15:21:11Z
dc.date.available2018-07-12T15:21:11Z
dc.date.issued2016
dc.date.updated2018-07-12T15:03:42Z
dc.description.abstractChemical modifications on recessed microelectrode array, achieved via electrodeposition techniques are reported here. Silicon-based gold microelectrode arrays of 10µm microband and microdisc array were selected and functionalised using sol-gel and nanoporous gold (NPG) respectively. For electrochemically assisted self-assembly (EASA) formati6154on of sol-gel, electrode surface was first pre-treated with a self-assembled partial monolayer of mercaptopropyltrimethoxysilane (MPTMS) before transferring it into the sol containing cetyltrimethyl ammonium bromide (CTAB)/tetraethoxysilane (TEOS):MPTMS (90:10) precursors. A cathodic potential is then applied. It was found that larger current densities were required in ensuring successful film deposition when moving from macro- to micro- dimensions. For NPG modification, a chemical etching process called dealloying was employed. NPG of three different thicknesses have been successfully deposited. All the modified and functionalized microelectrode arrays were characterized by both optical (SEM) and electrochemical analysis (cyclic voltammetry and impedance spectroscopy). An increase in surface area and roughness has been observed and such will benefit for future sensing application.en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationMohd Said, N. A., Ogurtsov, V. I., Twomey, K., Nagle, L. C. and Herzog, G. (2016) 'Chemically modified electrodes for recessed microelectrode array', Procedia Chemistry, 20, pp. 12-24. DOI: 10.1016/j.proche.2016.07.002en
dc.identifier.doi10.1016/j.proche.2016.07.002
dc.identifier.endpage24en
dc.identifier.issn1876-6196
dc.identifier.journaltitleProcedia Chemistryen
dc.identifier.startpage12en
dc.identifier.urihttps://hdl.handle.net/10468/6454
dc.identifier.volume20en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.ispartof11th Asian Conference on Chemical Sensors, ACCS 2015, Penang Malaysia, 16-17 November 2015.
dc.relation.urihttp://www.sciencedirect.com/science/article/pii/S1876619616300109
dc.rights© 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license https://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectElectrochemically assisted self-assemblyen
dc.subjectMesoporous silica filmsen
dc.subjectNanoporous golden
dc.subjectRecessed microelectrode arrayen
dc.subjectElectrochemical impedance spectroscopyen
dc.titleChemically modified electrodes for recessed microelectrode arrayen
dc.typeArticle (peer-reviewed)en
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