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Sol-gel derived amperometric nitric oxide microsensor

Authors :
Shin, Jae Ho
Weinman, Stephen W.
Schoenfisch, Mark H.
Source :
Analytical Chemistry. June 1, 2005, Vol. 77 Issue 11, p3494, 8 p.
Publication Year :
2005

Abstract

An amperometric sol-gel derived nitric oxide microsensor is described. Several silicon-based xerogel membranes are evaluated to identify the optimum composition for maximizing NO permeability while providing sufficient selectivity for NO in the presence of common interfering species. Xerogel permeability and selectivity are further manipulated as a function of reaction/processing conditions. In addition, the effects of incorporating Nation into the xerogel matrix on sensor performance and the stability of the ensuing xerogel/Nafion hybrid film are evaluated. The optimal permselective membrane is achieved by catalyzing polycondensation of the xerogel composed of methyltrimethoxysilane and (aminoethylaminomethyl)-phenethyltrimethoxysilane and Nation with NO gas. The resulting NO microsensor exhibits a sensitivity of 0.17 [+ or -] 0.02 pA/nM (from 25 to 800 nM, r = 0.9991), detection limit of 25 nM (S/N = 3), response time of 9 s ([t.sub.95%], a NO concentration change from 400 to 500 nM), selectivnap ity (log [K.sup.amp.sub.NOj]) of

Details

Language :
English
ISSN :
00032700
Volume :
77
Issue :
11
Database :
Gale General OneFile
Journal :
Analytical Chemistry
Publication Type :
Academic Journal
Accession number :
edsgcl.133464032