TITLE

Electrochemical study on screen-printed carbon electrodes with modification by iron nanoparticles in Fe(CN)64−/3− redox system

AUTHOR(S)
Shyh-Hwang Lee; Hung-Yuan Fang; Wen-Chang Chen; Hong-Ming Lin; Chang, C. Allen
PUB. DATE
October 2005
SOURCE
Analytical & Bioanalytical Chemistry;Oct2005, Vol. 383 Issue 3, p532
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The remarkable enhancement of electron transfer on screen-printed carbon electrodes (SPCEs) with modification by iron nanoparticles (Fenano), coupled with Fe(CN)64−/3− redox species, was characterized with an increase of electroactive area ( A ea) at electrode surface together with a decrease of heterogeneous electron transfer rate constant ( k°) in the system. Hence, Fenano-Fe(CN)63− SPCEs with deposition of glucose oxidase (GOD) demonstrated a higher sensitivity to various glucose concentrations than Fe(CN)63−/GOD-deposited SPCEs. In addition, an inhibited diffusion current from cyclic voltammograms was also observed with an increase in redox concentration and complicated the estimation of A ea. Further analysis by the electrochemical impedance method, it was shown that this effect might be resulted from the electrode surface blocking by the products of activated complex decomposition.
ACCESSION #
18591373

 

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