標題: Electrochemical study on screen-printed carbon electrodes with modification by iron nanoparticles in Fe(CN)(6)(4-/3-) redox system
作者: Lee, SH
Fang, HY
Chen, WC
Lin, HM
Chang, CA
生物科技學系
Department of Biological Science and Technology
關鍵字: heterogeneous electron transfer rate constant;electroactive area;screen-printed carbon electrode;iron nanoparticles;Fe(CN)(6) (4-/3) redox couple
公開日期: 1-Oct-2005
摘要: 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.
URI: http://dx.doi.org/10.1007/s00216-005-0034-5
http://hdl.handle.net/11536/13212
ISSN: 1618-2642
DOI: 10.1007/s00216-005-0034-5
期刊: ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume: 383
Issue: 3
起始頁: 532
結束頁: 538
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