ITO-ITO Dual-Plate Microgap Electrodes: E and EC′ Generator-Collector Processes

Andrew Gross; Frank Marken

doi:10.1002/elan.201400554

ITO-ITO Dual-Plate Microgap Electrodes: E and EC′ Generator-Collector Processes

Andrew Gross, Frank Marken

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Abstract

Tin-doped indium oxide electrodes are fabricated and employed in a dual-plate microtrench geometry with the inter-electrode gap controlling the mass transport conditions in generator-collector mode. Electrodes are fabricated with 2–50 µm gap sizes and variable trench depths by controlling assembly parameters. Non-ideal behaviour is observed for three aqueous redox systems: Ru(bpy) equation image, 1,1′-ferrocenedimethanol and Ru(NH3). Under fast mass transport conditions, the former two systems exhibit slower oxidation features. For Ru(NH3), non-steady-state behaviour is observed due to irreversible (ECirrev′) consumption of oxygen in the microtrench. A mechanism leading to hydrogen peroxide formation via superoxide in Ru(NH3) solution is proposed. Under optimised conditions all three redox systems provide reliable trench depth calibration information.

Original language	English
Pages (from-to)	1035-1042
Number of pages	8
Journal	Electroanalysis
Volume	27
Issue number	4
Early online date	6 Mar 2015
DOIs	https://doi.org/10.1002/elan.201400554
Publication status	Published - 30 Apr 2015

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10.1002/elan.201400554

ITO_Junction_Fabrication_ms_revised.pdf
This is the peer-reviewed version of the following article: Gross, A & Marken, F 2015, 'ITO-ITO Dual-Plate Microgap Electrodes: E and EC′ Generator-Collector Processes' Electroanalysis, vol 27, no. 4, pp. 1035-1042., 10.1002/elan.201400554, which has been published in final form at: http://dx.doi.org/10.1002/elan.201400554. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Accepted author manuscript, 1.65 MB

Cite this

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title = "ITO-ITO Dual-Plate Microgap Electrodes: E and EC′ Generator-Collector Processes",

abstract = "Tin-doped indium oxide electrodes are fabricated and employed in a dual-plate microtrench geometry with the inter-electrode gap controlling the mass transport conditions in generator-collector mode. Electrodes are fabricated with 2–50 µm gap sizes and variable trench depths by controlling assembly parameters. Non-ideal behaviour is observed for three aqueous redox systems: Ru(bpy) equation image, 1,1′-ferrocenedimethanol and Ru(NH3). Under fast mass transport conditions, the former two systems exhibit slower oxidation features. For Ru(NH3), non-steady-state behaviour is observed due to irreversible (ECirrev′) consumption of oxygen in the microtrench. A mechanism leading to hydrogen peroxide formation via superoxide in Ru(NH3) solution is proposed. Under optimised conditions all three redox systems provide reliable trench depth calibration information.",

author = "Andrew Gross and Frank Marken",

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AU - Marken, Frank

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N2 - Tin-doped indium oxide electrodes are fabricated and employed in a dual-plate microtrench geometry with the inter-electrode gap controlling the mass transport conditions in generator-collector mode. Electrodes are fabricated with 2–50 µm gap sizes and variable trench depths by controlling assembly parameters. Non-ideal behaviour is observed for three aqueous redox systems: Ru(bpy) equation image, 1,1′-ferrocenedimethanol and Ru(NH3). Under fast mass transport conditions, the former two systems exhibit slower oxidation features. For Ru(NH3), non-steady-state behaviour is observed due to irreversible (ECirrev′) consumption of oxygen in the microtrench. A mechanism leading to hydrogen peroxide formation via superoxide in Ru(NH3) solution is proposed. Under optimised conditions all three redox systems provide reliable trench depth calibration information.

AB - Tin-doped indium oxide electrodes are fabricated and employed in a dual-plate microtrench geometry with the inter-electrode gap controlling the mass transport conditions in generator-collector mode. Electrodes are fabricated with 2–50 µm gap sizes and variable trench depths by controlling assembly parameters. Non-ideal behaviour is observed for three aqueous redox systems: Ru(bpy) equation image, 1,1′-ferrocenedimethanol and Ru(NH3). Under fast mass transport conditions, the former two systems exhibit slower oxidation features. For Ru(NH3), non-steady-state behaviour is observed due to irreversible (ECirrev′) consumption of oxygen in the microtrench. A mechanism leading to hydrogen peroxide formation via superoxide in Ru(NH3) solution is proposed. Under optimised conditions all three redox systems provide reliable trench depth calibration information.

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ITO-ITO Dual-Plate Microgap Electrodes: E and EC′ Generator-Collector Processes

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Nanogap Electrochemistry and Sensor Technology at the Molecular Limit

MC2-Electron Microscopy (EM)

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ITO-ITO Dual-Plate Microgap Electrodes: E and EC′ Generator-Collector Processes

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Nanogap Electrochemistry and Sensor Technology at the Molecular Limit

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MC2-Electron Microscopy (EM)

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