Magneto-Induced Self-Assembling of Conductive Nanowires for Biosensor Applications
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- 作者：Javier Jimé ; nez ; Roman Sheparovych ; Marcos Pita ; Ará ; ntzazu Narvaez Garcí ; a ; Elena Dominguez ; Sergiy Minko ; Evgeny Katz
- 刊名：Journal of Physical Chemistry C
- 出版年：2008
- 出版时间：May 15, 2008
- 年：2008
- 卷：112
- 期：19
- 页码：7337 - 7344
- 全文大小：764K
- 年卷期：v.112,no.19(May 15, 2008)
- ISSN：1932-7455
文摘
A novel procedure to architecture nanoelectrode arrays with enhanced electrochemical properties was developed.Magneto-assisted formation of conducting nanowires upon self-assembling of Au-shell/CoFe2O4-magnetic-core nanoparticles (18 ± 3 nm diameter) was demonstrated on a Au electrode surface by application of anexternal magnetic field. The nanowires were visualized by atomic force microscopy showing similar diameters(40 nm) and a length increase from 0.57 to 1.53 
m when the time intervals allowed for the self-assemblingprocess ranged from 15 to 120 min. The conducting nanowires caused an increase of the electrode surfacearea yielding an electrochemical response to a diffusional redox probe (ferrocenemonocarboxylic acid) enhancedby ~6.5-fold after 120 min. The enhancement factor for the electrochemical process was controlled by thetime intervals allowed for the nanoelectrode array formation. The primary electrochemical reaction of theelectron relay was coupled with the bioelectrocatalytic oxidation of glucose in the presence of soluble glucoseoxidase resulting in the amplification of the biocatalytic cascade controlled by the growth of the nanostructuredassembly on the electrode surface. The studied nanoelectrode array was suggested as a general platform forelectrochemical biosensors with the enhanced current outputs controlled by the structure of the self-assemblednanowires.
m when the time intervals allowed for the self-assemblingprocess ranged from 15 to 120 min. The conducting nanowires caused an increase of the electrode surfacearea yielding an electrochemical response to a diffusional redox probe (ferrocenemonocarboxylic acid) enhancedby ~6.5-fold after 120 min. The enhancement factor for the electrochemical process was controlled by thetime intervals allowed for the nanoelectrode array formation. The primary electrochemical reaction of theelectron relay was coupled with the bioelectrocatalytic oxidation of glucose in the presence of soluble glucoseoxidase resulting in the amplification of the biocatalytic cascade controlled by the growth of the nanostructuredassembly on the electrode surface. The studied nanoelectrode array was suggested as a general platform forelectrochemical biosensors with the enhanced current outputs controlled by the structure of the self-assemblednanowires.