IEC 230 |
| John D. Watkins1, Henry S. White1, Emmanuel Maisonhaute2, Chrtistian Amatore2, Hector D. Abruņa3, and Christopher P. Smith4. (1) Department of Chemistry, University of Utah, University of Utah, 1400 E. 315 So, Salt Lake City, UT 84112, (2) Departement de Chimie, Ecole Normale Superieure, Paris, France, 24 rue Lhomond, F-75231 Paris Cedex 05, Paris, France, (3) Department of Chemistry & Chemical Biology, Cornell University, Ithaca, NY, Baker Laboratory, Ithaca, NY 14853, (4) The Blake School, Minneapolis, MN, Minneapolis, MN |
| Electrochemistry using individual electrodes of nanometer dimensions offers new opportunities to explore the influence of interfacial fields and structure on electron transfer and molecular transport. In this presentation, we describe the fabrication and characterization of individual Pt and Au electrodes of radius between 5 and 100 nm. High-speed voltammetric studies of adsorbed redox molecules and high-resolution transmission electron microscopy are used to determine the active electrode area. Voltammetric currents corresponding to as few as 10,000 adsorbed molecules can be detected at these electrodes. We demonstrate that as the electrode dimensions are reduced, the electrical double layer has a significant effect on electron-transfer rates. The results indicate that reducing the size of electrochemical active materials can influence electron transfer behaviors in unexpected fashion. Preliminary results of modeling the flow of current between two electrodes separated by nanometer length scales will also be presented. |
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Nanotechnology and the Environment
8:30 AM-11:55 AM, Thursday, March 27, 2003 Convention Center -- Room 392, Oral
Division of Industrial and Engineering Chemistry |