Electrochemical study on screen-printed carbon electrodes with modification by iron nanoparticles in Fe(CN)(6)
Shyh-Hwang Lee1, Hung-Yuan Fang, Wen-Chang Chen
1Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, 123 University Road, Douliou, Yunlin, Taiwan, ROC.
Abstract:
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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