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Localized Visualization of Chemical Cross-Talk in Microsensor Arrays by Using Scanning Electrochemical Microscopy |
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| Authors: | David J Strike Andreas Hengstenberg Maurizio Quinto Christian Kurzawa Milena Koudelka-Hep Wolfgang Schuhmann |
| Institution: | Institute of Microtechnology, University of Neuchatel, Rue Jaquet-Droz 1, CH-2007, Neuchatel, Switzerland, CH Analytische Chemie – Elektroanalytik und Sensorik, Ruhr-Universit?t Bochum, Universit?tsstr. 150, D-44780 Bochum, Germany, DE On leave from Dipartimento di Chimica, Università degli Studi di Bari, via Orabona 4, 70126 Bari, Italy, IT |
| Abstract: | An investigation of an array of four Pt microband electrodes 25 μm wide and spaced 25 μm apart was performed with the scanning electrochemical microscope (SECM). Where possible the SECM measurements were confirmed with conventional electrochemical measurements. It is shown how the sensiti- vity of the SECM recycling current to the activity of the underlying surface can be used to probe the homogeneity of enzyme-modified microelectrodes. The diffusion of H2O2 between these micro enzyme- electrodes and unmodified electrodes was investigated and it was demonstrated how the SECM can be a powerful tool in the elucidation of the properties of these electrodes. Received June 8, 1998. Revision November 12, 1998. |
| Keywords: | : microsensor arrays scanning electrochemical microscopy microband electrodes cross-talk |
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