Microring electrode/optical waveguide: electrochemical characterization and application to electrogenerated chemiluminescence.
A novel optoelectrochemical microprobe has been developed that allows the combination of optical and electrochemical methods in a very small system. The key element is a gold-coated optical fiber polished to a flat surface, such that the gold forms a microring electrode surrounding the optical fiber. The electrochemistry of the microring has been characterized; cyclic voltammetric and chronoamperometric limiting currents agree well with published theoretical treatments. The probe has also been used for electrogenerated chemiluminescence with tris(2,2'-bypyridine)ruthenium(II) with persulfate in 50:50 MeCN:H2O. Detection limits of 4.3 X 10(-8) M Ru(bpy)3(2+) have been obtained.
Department of Chemistry, University of Pittsburgh, Pennsylvania 15260.
L S
LS
Kuhn
A
A
Weber
S G
SG
Weber
D004563:Electrochemistry / Q000295:instrumentation*; D004566:Electrodes; D008163:Luminescent Measurements