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.
3. Walker, G.M., Ramsey, J.M., Cavin, R.K., Herr, D.J., Merzbacher, C.I. & Zhirnov, V. (2009, February). A Framework for Bioelectronics Discovery and Innovation. National Institute of Standards and Technology. Retrieved April 25, 2012, from http://www.nist.gov/pml/div683/upload/bioelectronics_report.pdf
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