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Lookup NU author(s): Dr Darren Walsh
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The electrochemical behavior of electrodes made by sealing carbon nanofibers in glass or with electrophoretic paint has been studied by scanning electrochemical microscopy (SECM). Because of their small electroactive surface area, conical geometry with a low aspect ratio and high overpotential for proton and oxygen reduction, carbon nanofiber (CNF) electrodes are promising candidates for producing electrode nanogaps, imaging with high spatial resolution and for the electrodeposition of single metal nanoparticles (e.g., Pt, Pd) for studies as electrocatalysts. By using the feedback mode of the SECM, a CNF tip can produce a gap that is smaller than 20 nm from a platinum disk. Similarly, the SECM used in a tip-collection substrate-generation mode, which subsequently shows a feedback interaction at short distances, makes it possible to detect a single CNF by another CNF and then to form a nanometer gap between the two electrodes. This approach was used to image vertically aligned CNF arrays. This method is useful in the detection in a homogeneous solution of short-lifetime intermediates, which can be electrochemically generated at one electrode and collected at the second at distances that are equivalent to a nanosecond time scale. © 2006 American Chemical Society.
Author(s): Tel-Vered R, Walsh DA, Mehrgardi MA, Bard AJ
Publication type: Article
Publication status: Published
Journal: Analytical Chemistry
Year: 2006
Volume: 78
Issue: 19
Pages: 6959-6966
ISSN (print): 0003-2700
ISSN (electronic): 1520-6882
Publisher: American Chemical Society
URL: http://dx.doi.org/10.1021/ac060723m
DOI: 10.1021/ac060723m
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