Characterization of Small Noble Metal Electrodes by Voltammetry and Energy Dispersive X-Ray Analysis
PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF CHEMISTRY
Pagination or Media Count:
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 10exp -4 to 10exp -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.
- Inorganic Chemistry
- Physical Chemistry
- Electricity and Magnetism
- Atomic and Molecular Physics and Spectroscopy