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Enzyme sensors prepared by electrodeposition on platinized platinum electrodes

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Authors
Kim, Chi S.; Oh, Seung M.
Issue Date
1999-11-30
Publisher
Elsevier;
Pergamon
Citation
Electrochimica Acta 41, 2433 (1996)
Keywords
platinized Pt electrodesGOD sensorsroughness factorssurface hydrophilicitysignal to noise ratio in current signals
Abstract
Platinized Pt (platinum black) electrodes were employed as a base electrode for the immobilization of glucose oxidase (GOD). The GOD sensors were prepared by first electrodeposition of GOD/ BSA(bovine serum albumin) mixture on platinized Pt and subsequent cross-linking with glutaraldehyde. The roughness factor and morphology of the platinized Pt surfaces significantly depended on the platinization potential between 0.0 and −0.25 V (vs. sat. Ag/AgCl). At more positive potentials, small Pt crystallites were uniformly deposited to give a flatter layer, while dendritic crystallites were prominent at the other extreme resulting in higher roughness factors. A preferred exposition of Pt(110) planes was also observed on the dendritic crystallite surfaces, onto which the protein molecules deposited with a faster rate than onto the Pt(100) planes. The current intensities to glucose of the resulting GOD sensors gradually increased as the plating potentials for the base electrodes were more negative, which was accounted for from the fact that larger amounts of the protein molecules deposited on those highly roughened and preferentially Pt(110)-exposed Pt black surfaces. In addition, the highly roughened Pt black electrodes gave rise to a better signal to noise ratio in the current signals of the resulting sensors. It is likely that the plantinization process imparts a higher hydrophilic character on the Pt black surfaces such that adhesion of oxygen bubbles is greatly suppressed.
ISSN
0013-4686
Language
English
URI
http://hdl.handle.net/10371/5641
DOI
https://doi.org/10.1016/0013-4686(96)00030-8

https://doi.org/10.1016/0013-4686(96)00030-8
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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