Characterization of Small Noble Metal Microelectrodes by Voltammetry and Energy-Dispersive X-ray Analysis

Timothy G. Strein, Andrew G. Ewing

Research output: Contribution to journalArticlepeer-review

Abstract

Construction and characterization of platinum and gold electrodes with total structural diameters of 1-2 nm 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 10-4-10-3 M in a 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 electrodes results in signal decay of 20-40% in a 10-min experiment. Pulsed amperometric detection minimizes electrode fouling, resulting in 5% or less signal decay over the same 10-min period.

Original languageEnglish (US)
Pages (from-to)1203-1209
Number of pages7
JournalAnalytical Chemistry
Volume65
Issue number9
DOIs
StatePublished - May 1 1993

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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