Dual electrochemical microsensor for simultaneous measurements of nitric oxide and oxygen: Fabrication and characterization

A planar-type amperometric dual microsensor was developed for the simultaneous measurement of the nitric oxide (NO) and oxygen (O 2) concentrations. The sensor (overall diameter = ∼500 μm) consisted of a dual working electrode (WE) containing two platinized platinum microdisks (25 μm diameter, WE1,...

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Bibliographic Details
Published in:Electrochemistry communications 2009-10, Vol.11 (10), p.2040-2043
Main Authors: Park, Sarah S., Tatum, Clarissa E., Lee, Youngmi
Format: Article
Language:English
Subjects:
Amperometry
Analytical chemistry
Chemistry
Cross-talk
Dual microsensor
Electrochemical methods
Exact sciences and technology
Nitric oxide
Oxygen
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Summary:A planar-type amperometric dual microsensor was developed for the simultaneous measurement of the nitric oxide (NO) and oxygen (O 2) concentrations. The sensor (overall diameter = ∼500 μm) consisted of a dual working electrode (WE) containing two platinized platinum microdisks (25 μm diameter, WE1, WE2, distance between two disks > ∼330 μm) and a Ag/AgCl wire reference electrode covered with an expanded poly(tetrafluoroethylene) gas-permeable membrane. The differentiation and concurrent measurements of NO and O 2 were obtained successfully using two sensing WEs with different applied potentials (+0.75 V for WE1 and −0.4 V for WE2). Cross-talk between WE1 and WE2 was eliminated with an optimized internal solution composition. Linear dynamic range, selectivity, sensitivity, detection limit (
ISSN:1388-2481
1873-1902
DOI:10.1016/j.elecom.2009.08.047