Electrodeposited highly porous gold microelectrodes for the direct electrocatalytic oxidation of aqueous glucose

Hendrik Du Toit, Mirella Di Lorenzo

Research output: Contribution to journalArticle

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Abstract

High-surface area electrode materials are particularly relevant for a vast range of applications, especially in the field of catalysis and electrochemical energy conversion (e.g. fuel cells).

In this work high surface area gold electrodes were produced by direct electrodeposition of highly porous gold (hPG) films onto gold electrodes via a very fast (15 sec), simple, and cost-effective methodology that involves a hydrogen bubble template. This methodology was also successfully applied to gold microelectrodes produced by lift-off lithography, thus paving the way for interesting lab-on-a–chip applications.

The hPG electrodes showed very high sensitivity towards glucose, with a detection limit of 5 μM. This reactivity was maintained when the electrodes were tested in artificial urine, thus encouraging their use in healthcare.

The hPG electrodes showed high sensitivity also towards other aldoses and other reducing sugars (maltose, lactose, galactose).
LanguageEnglish
Pages725-729
JournalSensors and Actuators B-Chemical
Volume192
Early online date15 Nov 2013
DOIs
StatusPublished - 1 Mar 2014

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Microelectrodes
glucose
Gold
Glucose
gold
Oxidation
oxidation
Electrodes
electrodes
methodology
Maltose
lactose
galactose
Lab-on-a-chip
urine
sensitivity
energy conversion
Lactose
electrode materials
sugars

Cite this

Electrodeposited highly porous gold microelectrodes for the direct electrocatalytic oxidation of aqueous glucose. / Du Toit, Hendrik; Di Lorenzo, Mirella.

In: Sensors and Actuators B-Chemical, Vol. 192, 01.03.2014, p. 725-729.

Research output: Contribution to journalArticle

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