Chemically modified electrodes for recessed microelectrode array
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Published Version
Date
2016
Authors
Mohd Said, Nur Azura
Ogurtsov, Vladimir I.
Twomey, Karen
Nagle, Lorraine C.
Herzog, G.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Published Version
Abstract
Chemical 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.
Description
Keywords
Electrochemically assisted self-assembly , Mesoporous silica films , Nanoporous gold , Recessed microelectrode array , Electrochemical impedance spectroscopy
Citation
Mohd 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.2016.07.002