Diffusional Transport to Nanoscopic Band Electrodes

Abstract

Diffusion controlled reactions of electroactive molecules at 2 0- 1000A wide platinum band electrodes are reported. The reduction of 5,6,11,12-?Cp Ru(eta-C6H5)4napthacene! 4+ and oxidation of Cp 2Fe (Cp = pentamethylcyclopentadienyl) occur at significantly lower rates at electrodes less than 200A wide than predicted by transport equations based on continuum fluid structure. The results are in qualitative agreement with a recently proposed size-effect theory that accounts for (i) finite dimensions of the reacting molecule and (ii) a decrease in molecular diffusivity near a charged electrode surface. Scanning tunneling microscopy of Pt films used in electrode fabrication indicates an average surface roughness of ca. 10-15A. Microelectrodes molecular transport; Interfacial fluid structure.

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Document Details

Document Type
Technical Report
Publication Date
Dec 05, 1988
Accession Number
ADA202309

Entities

People

  • Erik R. Scott
  • Henry S. White
  • J. D. Seibold

Organizations

  • University of Minnesota

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Boltzmann Equation
  • Chemical Engineering
  • Chemical Synthesis
  • Chemistry
  • Crystal Structure
  • Electrodes
  • Engineering
  • Equations
  • Films
  • Geometry
  • Materials
  • Materials Science
  • Metal Films
  • Microscopy
  • Molecular Dynamics
  • Thick Films
  • Thin Films

Readers

  • Combustion science or combustion engineering.
  • Electrochemical Surface Science
  • Thin Film Deposition Science.