Direct electrochemistry and electrocatalysis of hemoglobin on a gold ion implantation-modified indium tin oxide electrode

In this paper, a gold nanoparticle-modified indium tin oxide electrode (Au/ITO) was prepared without the use of any cross-linker or stabilizer reagent. The prepared Au/ITO was used as a new platform to achieve the direct electron transfer between Hb and the modified electrode. The proposed electrode...

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Bibliographic Details
Published in:Journal of solid state electrochemistry 2013-03, Vol.17 (3), p.655-660
Main Authors: Jia, Mingzhe, Liang, Fenfen, Jiao, Jiao, Li, Shuoqi, Hu, Jingbo
Format: Article
Language:English
Subjects:
Analytical Chemistry
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Electrochemistry
Energy Storage
Original Paper
Physical Chemistry
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Summary:In this paper, a gold nanoparticle-modified indium tin oxide electrode (Au/ITO) was prepared without the use of any cross-linker or stabilizer reagent. The prepared Au/ITO was used as a new platform to achieve the direct electron transfer between Hb and the modified electrode. The proposed electrode exhibited a pair of well-defined redox peaks with a formal potential of −0.073 V (vs. Ag/AgCl). The immobilized Hb showed excellent electrocatalytic activity toward H 2 O 2 and the electrocatalytic current values were linear with the increasing concentration of H 2 O 2 ranging from 1.0 × 10 −6  M to 7.0 × 10 −4  M. The detection limit was 2.0 × 10 −7  M (S/N = 3) and the Michaelis–Menten constant was calculated to be 0.2 mM. The proposed electrode also showed high selectivity, long-term stability, and good reproducibility.
ISSN:1432-8488
1433-0768
DOI:10.1007/s10008-012-1906-1