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Fabrication of Electrochemical Nanoelectrode for Sensor Application Using Focused Ion Beam Technology

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Łaszcz A., Nogala W., Czerwinski A., Ratajczak J., Kątcki J.
Polish Journal of Chemical Technology
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2014
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vol. 16
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issue 3
40-44
EN
The capabilities and applications of the focused ion beam (FIB) technology for detection of an electrochemical signal in nanoscale area are shown. The FIB system, enabling continuous micro- and nanofabrication within only one equipment unit, was used to produce a prototype of electrochemical nanometer-sized electrode for sensor application. Voltammetric study of electrochemically active compound (ferrocenemethanol) revealed the diffusion limiting current (12 pA), corresponding to a disc (planar) nanoelectrode with about 70 nm diameter of contact area. This size is in a good accordance with the designed contact-area (50 nm × 100 nm for width × thickness) of the FIB-produced nanoelectrode. It confirms that produced nanoelectrode is working properly in liquid solution and may enable correct measurements in nanometer-sized regions.
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