Abstract
A multilayer film composed of ferrocene(Fc)-appended poly(allylamine hydrochloride) (Fc-PAH) and poly(potassium vinylsulfate) (PVS) has been prepared on the surface of a gold(Au) electrode by using a layer-by-layer self-assembly technique. Fc-containing polyelectrolyte multilayer (PEM) film-modified electrodes can electrochemically catalyze the oxidation of ascorbic acid successfully. For a 2 (Fc-PAH/PVS) bilayer-covered electrode the catalytic current increased linearly with increasing concentration of ascorbic acid over the concentration range 6 μmol L–1–3 mmol L–1. To extend the dynamic range for ascorbic acid, the surface of the Au electrode was first covered with a (PAH/PVS)2 film on which an additional (Fc-PAH/PVS)5 film was coated. This strategy successfully extended the dynamic range of the electrode up to 25 mmol L–1 ascorbic acid, because the (PAH/PVS)2 layer blocked access of ascorbic acid to the electrode surface. The upper detection limit of the (PAH/PVS)2 (Fc-PAH/PVS)5 film-modified electrode is much higher than those of Fc-based ascorbic acid sensors reported so far. Electron transfer is diffusion-controlled within the (PAH/PVS)2(Fc-PAH/PVS)5 film.
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Liu, A., Anzai, Ji. Ferrocene-containing polyelectrolyte multilayer film-covered electrodes: electrocatalytic determination of ascorbic acid and use of inner blocking layers to improve the upper detection limit of the electrodes. Anal Bioanal Chem 380, 98–103 (2004). https://doi.org/10.1007/s00216-004-2728-5
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DOI: https://doi.org/10.1007/s00216-004-2728-5