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Anal Chim Acta. 2013 Jul 5;786:34-8. doi: 10.1016/j.aca.2013.05.029. Epub 2013 May 23.

An ultrasensitive iron(III)-complex based hydrogen peroxide electrochemical sensor based on a nonelectrocatalytic mechanism.

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  • 1Jiangsu Key Laboratory of New Power Batteries, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, PR China.

Abstract

In this communication, the first nonelectrocatalysis-type hydrogen peroxide electrochemical sensor is reported. The electroactive iron(III) diethylenetriaminepentaacetic acid (DTPA-Fe(III)) complex is immobilized on the cysteamine (cys) modified nanoporous gold (NPG) films by covalent method. The immobilized DTPA-Fe(III) complex quickly communicates an electron with the electrode. Upon addition of hydrogen peroxide, however, hydrogen peroxide inhibits the direct electron transfer of the DTPA-Fe(III) complex due to the generation of nonelectroactive DTPA-Fe(III)-H2O2 complex. Based on quenching mechanism, the first hydrogen peroxide electrochemical sensor based on a nonelectrocatalytic mechanism is developed. The novel hydrogen peroxide electrochemical sensor has the ultralow detection limit (1.0×10(-14) M) and wide linear range (1.0×10(-13) to 1.0×10(-8) M) with excellent reproducibility and stability.

Copyright © 2013 Elsevier B.V. All rights reserved.

PMID:
23790289
[PubMed - indexed for MEDLINE]
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