Characterization of Small Noble Metal Electrodes by Voltammetry and Energy Dispersive X-Ray Analysis
Abstract
Construction and characterization of platinum and gold electrodes with total structural diameters of 1-2 micrometers is described. These small voltammetric probes have been constructed by direct electroreduction of noble metals onto the tips of etched carbon fiber microdisk electrodes. Voltammetry, electron microscopy, energy-dispersive x-ray analysis, and pulsed amperometric detection have been used to characterize these electrodes. Dopamine concentrations have been determined over a range of 10(exp -4) to 10(exp -3) M in the biological buffer system which contains 25 mM glucose, a compound known to adsorb strongly to electrodes. Amperometric monitoring at a constant potential with these small results in signal decay of 20% to 40% in a ten minute experiment. Pulsed amperometric detection minimizes electrode fouling, resulting in 5% or less signal decay over the same ten minute period.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 26, 1993
- Accession Number
- ADA265208
Entities
People
- Andrew G Ewing
- Timothy G. Strein
Organizations
- Pennsylvania State University