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KMID : 1059520220660060436
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Journal of the Korean Chemical Society
2022 Volume.66 No. 6 p.436 ~ p.441
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Fabrication of Ultramicroelectrodes with Nanoporous Gold Structures by Potentiostatic Anodization
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Shin Seo-In
Lee Si-Yeon
Kim Jong-Won
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Abstract
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Because the nanoporous electrodes has large electrochemical surface areas, extensive studies have been focused on their fabrication methods. In this paper, a method for introducing a nanoporous gold (NPG) structure on the sur- face of an ultramicroelectrode (UME) using potentiostatic anodization was investigated. A well-defined NPG structure was introduced on the surface of the UME when a potential of 1.3 V was applied in 0.1 M phosphate buffer solution (pH 8) con- taining 1 M KCl. The anodic oxidation efficiency was investigated by observing the effect of the applied potential, the reac- tion time, and the size of the electrode on the roughness factor (Rf) of the prepared NPG-UMEs. In a short time of about 10 minutes, NPG-UME with a large Rf value of about 2000 could be prepared, which could be effectively used for electrochemi- cal glucose detection. The results shown in this work are expected to have great applicability when performing electrochemi- cal analysis with a small sample volume.
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KEYWORD
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Ultramicroelectrode, Nanoporous gold, Anodization, Potentiostatic, Roughness factor
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