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750073 
Journal Article 
Electrochemical study on screen-printed carbon electrodes with modification by iron nanoparticles in Fe(CN)(6) (4-/3-) redox system 
Lee, SH; Fang, HY; Chen, WC; Lin, HM; Chang, CA 
2005 
Yes 
Analytical and Bioanalytical Chemistry
ISSN: 1618-2642
EISSN: 1618-2650 
383 
3 
532-538 
English 
16136306 
The remarkable enhancement of electron transfer on screen-printed carbon electrodes (SPCEs) with modification by iron nanoparticles (Fe(nano)), coupled with Fe(CN)(6) (4-/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 degrees ) in the system. Hence, Fe(nano)-Fe(CN)(6) (3-) SPCEs with deposition of glucose oxidase (GOD) demonstrated a higher sensitivity to various glucose concentrations than Fe(CN)(6) (3-)/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. 
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• Nanoscale Carbon