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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.
Kuhn et al. (Wed,) studied this question.