Spectroelectrochemical Sensing Based on Multimode Selectivity Simultaneously Achievable in a Single Device. 6. Sensing with a Mediator
- 29 June 2000
- journal article
- research article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 72 (15) , 3461-3467
- https://doi.org/10.1021/ac991418m
Abstract
The use of a mediator to detect a nonabsorbing analyte during spectroelectrochemical modulation is demonstrated. The charge-selective composite film of Nafion−SiO2 was used to entrap the mediator, Ru(bipy)32+. The change in ΔA as detected by attenuated total reflection was then observed upon addition of the analyte, ascorbate. The effects of scan rate, concentration of mediator, film thickness, and analyte charge were studied to achieve optimal sensor conditions. The model sensor exhibited a linear range from 0.26 to 2.0 mM (R2 = 0.998).Keywords
This publication has 6 references indexed in Scilit:
- Characterization of perfluorosulfonic acid polymer coated enzyme electrodes and a miniaturized integrated potentiostat for glucose analysis in whole bloodAnalytical Chemistry, 1988
- Detection of dopamine dynamics in the brainAnalytical Chemistry, 1988
- BALZERSAnalytical Chemistry, 1984
- Spectroelectrochemistry: The combination of optical and electrochemical techniquesJournal of Chemical Education, 1983
- Polymer films on electrodes. 9. Electron and mass transfer in Nafion films containing tris(2,2'-bipyridine)ruthenium(2+)Journal of the American Chemical Society, 1982
- Optical interference method for the approximate determination of refractive index and thickness of a transparent layerApplied Optics, 1978