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Atomic resolution imaging of electrode surfaces in solutions containing reversible redox species

Heben, Michael J. and Penner, Reginald M. and Lewis, Nathan S. and Dovek, Moris M. and Quate, Calvin F. (1989) Atomic resolution imaging of electrode surfaces in solutions containing reversible redox species. Applied Physics Letters, 54 (15). pp. 1421-1423. ISSN 0003-6951. http://resolver.caltech.edu/CaltechAUTHORS:HEBapl89

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Abstract

Procedures are described for insulating metal scanning tunneling microscope (STM) tips with either glass or polymer coatings. In solutions containing 0.10 M of a reversible redox couple, Fe(CN)<sup> - 3/-4</sup><sub>6</sub> , the faradaic limiting current to polymer coated tips was 200–500 pA and that for glass coated tips was <10 pA. For polymer insulated tips, steady-state currents of 10–100 pA were observed at tip-sample displacements less than 0.3 µm. The suppression of faradaic current achieved by these coating procedures enabled the collection of the first atomic resolution STM images of highly ordered pyrolytic graphite electrodes in contact with redox-active electrolytes. Preliminary data for the in situ electrochemical characterization of these tips are also discussed.


Item Type:Article
Additional Information:Copyright © 2006 American Institute of Physics (Received 21 November 1988; accepted 30 January 1989) We thank J. Schneir and Professor A. J. Bard for preprints of related STM work on electrodes, and acknowledge helpful discussions with Professor P. Hansma. We also acknowledge partial support of this research at Caltech by the Office of Naval Research and at Stanford by the Defense Advanced Research Projects Agency.
Subject Keywords:GRAPHITE; ELECTROCHEMISTRY; SURFACE REACTIONS; SURFACE STRUCTURE; TOPOGRAPHY; RESOLUTION; GLASS; POLYMERS; SCANNING TUNNELING MICROSCOPY
Record Number:CaltechAUTHORS:HEBapl89
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HEBapl89
Alternative URL:http://dx.doi.org/10.1063/1.100686
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5625
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:26 Oct 2006
Last Modified:26 Dec 2012 09:13

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