Mesoporous gold electrodes for sensors based on electrochemical double layer capacitance

Mortari, A; Maaroof, A; Martin, D; Cortie, MB

Mesoporous gold electrodes for sensors based on electrochemical double layer capacitance

Mortari, A Maaroof, A Martin, D Cortie, MB

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Publication Type:: Journal Article
Citation:: Sensors and Actuators, B: Chemical, 2007, 123 (1), pp. 262 - 268
Issue Date:: 2007-04-10

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Field	Value	Language
dc.contributor.author	Mortari, A	en_US
dc.contributor.author	Maaroof, A	en_US
dc.contributor.author	Martin, D	en_US
dc.contributor.author	Cortie, MB https://orcid.org/0000-0003-3202-6398	en_US
dc.date.issued	2007-04-10	en_US
dc.identifier.citation	Sensors and Actuators, B: Chemical, 2007, 123 (1), pp. 262 - 268	en_US
dc.identifier.issn	0925-4005	en_US
dc.identifier.uri	http://hdl.handle.net/10453/588
dc.description.abstract	The use of mesoporous gold as electrode material for measurement of electrochemical capacitance is investigated. The electrodes possess a pore size in the range of 10-30 nm and are prepared by de-alloying films of AuAlx, where x ≥ 2. Analyses conducted with X-ray photoelectron spectra (XPS) show that their surfaces are essentially pure gold, with only traces of aluminium remaining. The electrodes show near-ideal capacitor behaviour under both cyclic voltammetry and potential-step conditions. The higher capacitance of the mesoporous electrodes leads to a better dynamic range in potential-step experiments, resulting in improved accuracy of measurement. The sensitivity of the new material as a capacitive sensor is demonstrated in a milk fouling experiment, and is improved by up to 30 times compared to the control sample of ordinary planar gold. We propose that the use of mesoporous gold electrodes offers a convenient way to sensitively and accurately amplify the capacitance signal of an electrochemical sensor. © 2006 Elsevier B.V. All rights reserved.	en_US
dc.relation.ispartof	Sensors and Actuators, B: Chemical	en_US
dc.relation.isbasedon	10.1016/j.snb.2006.08.018	en_US
dc.subject.classification	Analytical Chemistry	en_US
dc.title	Mesoporous gold electrodes for sensors based on electrochemical double layer capacitance	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	123	en_US
utslib.for	0306 Physical Chemistry (incl. Structural)	en_US
utslib.for	0301 Analytical Chemistry	en_US
utslib.for	0205 Optical Physics	en_US
utslib.for	0912 Materials Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Medical and Molecular Sciences
utslib.copyright.status	open_access
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	123	en_US

Abstract:

The use of mesoporous gold as electrode material for measurement of electrochemical capacitance is investigated. The electrodes possess a pore size in the range of 10-30 nm and are prepared by de-alloying films of AuAlx, where x ≥ 2. Analyses conducted with X-ray photoelectron spectra (XPS) show that their surfaces are essentially pure gold, with only traces of aluminium remaining. The electrodes show near-ideal capacitor behaviour under both cyclic voltammetry and potential-step conditions. The higher capacitance of the mesoporous electrodes leads to a better dynamic range in potential-step experiments, resulting in improved accuracy of measurement. The sensitivity of the new material as a capacitive sensor is demonstrated in a milk fouling experiment, and is improved by up to 30 times compared to the control sample of ordinary planar gold. We propose that the use of mesoporous gold electrodes offers a convenient way to sensitively and accurately amplify the capacitance signal of an electrochemical sensor. © 2006 Elsevier B.V. All rights reserved.

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http://hdl.handle.net/10453/588