Artículo
Abstract:
Quartz crystal impedance around the resonant frequency at 10 MHz of a composite quartz crystal resonator has been studied simultaneously with cyclic voltammetry. A modified quartz crystal with a redox hydrogel (poly(allylamine)-ferrocene cross-linked with glucose oxidase) and immersed in liquid electrolyte was used. Impedance parameters (Rf and XLf) of the surface redox gel film were obtained by fitting the resonator transfer function |Vo/Vi| vs ω to a BVD equivalent circuit and analyzed with the multiple nonpiezoelectric layer model of Martin. Two limiting hydrogel layers of the same composition were studied while oxidizing and reducing the ferrocene/ferricenium moieties attached to the swollen polymer backbone: thin and thick redox hydrogel films. For the thin films, the Sauerbrey approximation was valid. The mass/thickness and film viscosity changes that resulted from the anion and water exchange were evaluated while redox switching the polymer on the assumption of negligible storage modulus G′ and a density of 1. For thick gel layers, on the other hand, the penetration depth of the acoustic wave was far less than the film thickness, and a liquid-like behavior was apparent. Film storage modulus and film loss modulus were simultaneously evaluated with the cyclic voltammetry.
Registro:
| Documento: | Artículo |
| Título: | Electrochemical Quartz Crystal Impedance Study of Redox Hydrogel Mediators for Amperometric Enzyme Electrodes |
| Autor: | Etchenique, R.A.; Calvo, E.J. |
| Filiación: | INQUIMAE, Depto. Quim. Inorg., Analitica Q., Universidad de Buenos Aires, AR-1428 Buenos Aires, Argentina Argentine Science Research Council, Argentina |
| Año: | 1997 |
| Volumen: | 69 |
| Número: | 23 |
| Página de inicio: | 4833 |
| Página de fin: | 4841 |
| DOI: | http://dx.doi.org/10.1021/ac970413r |
| Título revista: | Analytical Chemistry |
| Título revista abreviado: | Anal. Chem. |
| ISSN: | 00032700 |
| CODEN: | ANCHA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00032700_v69_n23_p4833_Etchenique |
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Citas:
---------- APA ----------
Etchenique, R.A. & Calvo, E.J. (1997) . Electrochemical Quartz Crystal Impedance Study of Redox Hydrogel Mediators for Amperometric Enzyme Electrodes. Analytical Chemistry, 69(23), 4833-4841.http://dx.doi.org/10.1021/ac970413r
---------- CHICAGO ----------
Etchenique, R.A., Calvo, E.J. "Electrochemical Quartz Crystal Impedance Study of Redox Hydrogel Mediators for Amperometric Enzyme Electrodes" . Analytical Chemistry 69, no. 23 (1997) : 4833-4841.http://dx.doi.org/10.1021/ac970413r
---------- MLA ----------
Etchenique, R.A., Calvo, E.J. "Electrochemical Quartz Crystal Impedance Study of Redox Hydrogel Mediators for Amperometric Enzyme Electrodes" . Analytical Chemistry, vol. 69, no. 23, 1997, pp. 4833-4841.http://dx.doi.org/10.1021/ac970413r
---------- VANCOUVER ----------
Etchenique, R.A., Calvo, E.J. Electrochemical Quartz Crystal Impedance Study of Redox Hydrogel Mediators for Amperometric Enzyme Electrodes. Anal. Chem. 1997;69(23):4833-4841.http://dx.doi.org/10.1021/ac970413r
