Application of sol-gel technology for electroanalytical sensing.


Shustak G, Marx S, Turyan I, Mandler D. Application of sol-gel technology for electroanalytical sensing. ElectroanalysisElectroanalysis. 2003;15 (5-6) :398 - 408.

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The applicability of thin sol-gel films as selective interfaces in electrochem. sensors has been examd. This requires not only to create a selective interface but also to enable facile diffusion of the analytes across the films. Creation of selectivity has been aimed by molecularly imprinting an electroactive species in the course of sol-gel formation. We have focused primarily on imprinting an iron(II) complex, i.e., tris(2,2'-bipyridine)iron(II) (Fe(bpy)2+3), as a means of selectively detg. iron(II) in aq. soln. Hence, the effect of different parameters, such as the compn. of the sol-gel film and the hydrolysis and drying time, on the diffusion of Fe(bpy)2+3, has been studied. We find that diffusion can be remarkably enhanced upon adding polyethylene glycol or a surfactant, such as decanoic acid. Nevertheless, so far we have not been able to develop thin films, which exhibit selectivity towards this inorg. species. The difficulties in designing such selective interfaces for heavy metals as opposed to org. species is demonstrated by successfully applying the same approach for designing a selective interface for diethyl-p-nitrophenyl phosphate (paraoxon). [on SciFinder(R)]


CAPLUS AN 2003:375341(Journal)